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Pension and Other Postretirement Benefits (Details) (USD $) In Thousands, unless otherwise specified | 1 Months Ended | 12 Months Ended
--- | --- | ---
Jun. 30, 2011 | Dec. 31, 2011 | Dec. 31, 2010 | Dec. 31, 2009
Pension and Other Postretirement Benefits [Abstract] |  |  |  |  |  |  |
Number of directors elected to Board of Directors | 3 | 3 |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  | $ 34,400 |  |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | 130,427 |  |  |  |  |
Benefit obligation at end of period |  | 164,565 |  | 130,427 |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | 73,878 |  |  |  |  |
Employer contributions |  | 34,400 |  |  |  |  |
Fair value of assets at end of period |  | 84,966 |  | 73,878 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Net loss |  | 62,212 |  | 32,319 |  | (36,798) |
Prior service benefit arising during the period |  | 0 |  | (112,488) |  | (9,153) |
Amortization of prior service benefit (cost) |  | 32,677 |  | 61,216 |  | 1,338 |
Projected Benefit Obligation |  | 164,565 |  | 130,427 |  |  |
Accumulated Benefit Obligation |  | 156,748 |  | 126,052 |  |  |
Fair value of pension plan assets |  | 84,966 |  | 73,878 |  |  |
Weighted average assumptions used to determine net periodic benefit cost [Abstract] |  |  |  |  |  |  |
Effect of one percentage point increase on total of service and interest cost |  | 1,198 |  |  |  |  |
Effect of one percentage point decrease on total of service and interest cost |  | (977) |  |  |  |  |
Effect of one percentage point increase on accumulated postretirement benefit obligation |  | 21,099 |  |  |  |  |
Effect of one percentage point decrease on accumulated postretirement benefit obligation |  | (17,296) |  |  |  |  |
Company matching contribution to defined contribution (401(k)) plans |  | 640 |  | 0 |  | 0 |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 84,966 |  | 73,878 |  |  |
Supplemental Executive Benefits Pension Plan SERB [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  | 16,700 |  |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | 19,658 |  |  |  |  |
Benefit obligation at end of period |  | 24,694 |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  |  |  |  |
Employer contributions |  | 16,700 |  |  |  |  |
Fair value of assets at end of period |  | 0 |  |  |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Projected Benefit Obligation |  | 24,694 |  |  |  |  |
Accumulated Benefit Obligation |  | 23,461 |  | 19,143 |  |  |
Fair value of pension plan assets |  | 0 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  |  |  |  |
Qualified Defined Benefit Plans [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  | 17,700 |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Employer contributions |  | 17,700 |  |  |  |  |
Pension [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  | 19,004 |  | 1,895 |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | 130,427 |  | 114,181 |  |  |
Service cost |  | 3,133 |  | 2,979 |  | 2,784 |
Interest cost |  | 6,976 |  | 6,407 |  | 6,482 |
Plan changes |  | 0 |  | 0 |  |  |
Medicare Part D |  | 0 |  | 0 |  |  |
Actuarial loss |  | 30,490 |  | 8,762 |  |  |
Benefits paid |  | (7,608) |  | (6,458) |  |  |
Curtailment/special termination benefits |  | 1,147 |  | 4,556 |  | 0 |
Benefit obligation at end of period |  | 164,565 |  | 130,427 |  | 114,181 |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | 73,878 |  | 69,626 |  |  |
Actual return on plan assets |  | (307) |  | 8,815 |  |  |
Employer contributions |  | 19,004 |  | 1,895 |  |  |
Benefits paid |  | (7,608) |  | (6,458) |  |  |
Fair value of assets at end of period |  | 84,967 |  | 73,878 |  | 69,626 |
Funded status of plans [Abstract] |  |  |  |  |  |  |
Funded status |  | (79,598) |  | (56,549) |  |  |
Amounts Recognized in the Statement of Financial Position [Abstract] |  |  |  |  |  |  |
Current liabilities |  | (8,699) |  | (18,754) |  |  |
Non-current liabilities |  | (70,899) |  | (37,794) |  |  |
Net amount recognized |  | (79,598) |  | (56,549) |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Net loss (gain) |  | 80,092 |  | 44,527 |  |  |
Prior service cost (benefit) |  | 608 |  | 746 |  |  |
Total |  | 80,700 |  | 45,273 |  |  |
Net loss |  | 37,427 |  | 5,322 |  |  |
Prior service benefit arising during the period |  | 0 |  | 0 |  |  |
Amortization of net loss |  | (1,863) |  | (1,660) |  |  |
Amortization of prior service benefit (cost) |  | (137) |  | (137) |  |  |
Prior service cost (benefit) recognized due to plan amendments |  | 0 |  | 0 |  |  |
Total amount recognized in other comprehensive loss |  | 35,427 |  | 3,525 |  |  |
Net periodic benefit cost |  | 6,625 |  | 10,363 |  | 9,773 |
Total recognized in net periodic benefit cost and other comprehensive loss |  | 42,052 |  | 13,888 |  |  |
Projected Benefit Obligation |  | 164,565 |  | 130,427 |  | 114,181 |
Fair value of pension plan assets |  | 84,967 |  | 73,878 |  | 69,626 |
Expected pension plan contributions |  | 8,699 |  |  |  |  |
Expected OPEB benefits payments |  | 7,682 |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |
Service cost |  | 3,133 |  | 2,979 |  | 2,784 |
Interest cost |  | 6,976 |  | 6,407 |  | 6,482 |
Expected return on plan assets |  | (6,631) |  | (5,376) |  | (4,336) |
Amortization of prior service costs |  | 137 |  | 137 |  | 162 |
Amortization of net loss |  | 1,863 |  | 1,660 |  | 2,105 |
Net periodic benefit cost |  | 5,478 |  | 5,807 |  | 7,197 |
Special termination benefits |  | 1,147 |  | 4,556 |  | 0 |
Effect of plan amendments |  | 0 |  | 0 |  | 0 |
Curtailment cost |  | 0 |  | 0 |  | 2,576 |
Total net periodic benefit cost |  | 6,625 |  | 10,363 |  | 9,773 |
Amounts that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year [Abstract] |  |  |  |  |  |  |
Estimated net loss (gain) expected to be amortized from accumulated other comprehensive income into net periodic benefit cost |  | 3,521 |  |  |  |  |
Estimated prior service cost (benefit) expected to be amortized from accumulated other comprehensive income into net periodic benefit cost |  | 137 |  |  |  |  |
Weighted average assumptions used in calculating benefit obligations [Abstract] |  |  |  |  |  |  |
Discount rate (in hundredths) |  | 4.25% |  | 5.38% |  |  |
Rate of compensation increase, year one (in hundredths) |  | 3.00% | [1] | 3.00% | [1] |  |
Rate of compensation increase, year two (in hundredths) |  | 4.00% | [1] | 3.00% | [1] |  |
Rate of compensation increase, years thereafter (in hundredths) |  | 4.00% | [1] | 4.00% | [1] |  |
Measurement date |  | 12/31/2011 |  | 12/31/2010 |  |  |
Weighted average assumptions used to determine net periodic benefit cost [Abstract] |  |  |  |  |  |  |
Measurement date |  | 12/31/2010 |  | 12/31/2009 |  | 12/31/2008 |
Fiscal year end |  | 12/31/2011 |  | 12/31/2010 |  | 12/31/2009 |
Discount rate (in hundredths) |  | 5.49% | [1] | 5.75% |  | 6.54% |
Rate of compensation increase (in hundredths) |  | 3.00% |  | 2.00% |  | 4.00% |
Rate of compensation increase, year two (in hundredths) |  | 3.00% |  | 3.00% |  |  |
Rate of compensation increase, years thereafter (in hundredths) |  | 4.00% |  | 4.00% |  |  |
Expected return on plan assets (in hundredths) |  | 8.00% |  | 8.00% |  | 8.00% |
Target asset allocations [Abstract] |  |  |  |  |  |  |
Target asset allocation percentage of assets, U.S. equities (in hundredths) |  | 50.00% |  | 50.00% |  |  |
Target asset allocation percentages of assets, International equities (in hundredths) |  | 15.00% |  | 15.00% |  |  |
Target asset allocation percentages of assets, fixed income (in hundredths) |  | 35.00% |  | 35.00% |  |  |
Actual plan asset allocations [Abstract] |  |  |  |  |  |  |
U.S. equities |  | 51.00% |  | 50.00% |  |  |
International equities |  | 14.00% |  | 15.00% |  |  |
Fixed income |  | 35.00% |  | 35.00% |  |  |
Actual asset allocation percentages of assets (in hundredths) |  | 100.00% |  | 100.00% |  |  |
Defined benefit plan net periodic benefit cost long-term rate of return on plan assets assumed (in hundredths) |  | 8.00% |  | 8.00% |  | 8.00% |
Expected future benefit payments |  | 7,682 |  |  |  |  |
Estimated future employer contributions in next fiscal year |  | 8,699 |  |  |  |  |
Estimated future benefit payments [Abstract] |  |  |  |  |  |  |
2012 |  | 7,682 |  |  |  |  |
2013 |  | 7,737 |  |  |  |  |
2014 |  | 8,212 |  |  |  |  |
2015 |  | 8,373 |  |  |  |  |
2016 |  | 8,464 |  |  |  |  |
2017 - 2021 |  | 49,922 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 84,967 |  | 73,878 |  | 69,626 |
Pension [Member] | Level 1 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | Level 2 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 84,967 |  | 73,878 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 84,967 |  | 73,878 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 84,967 |  | 73,878 |  |  |
Pension [Member] | Level 3 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | U.S. Equities [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 43,058 |  | 36,848 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 43,058 |  | 36,848 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 43,058 |  | 36,848 |  |  |
Pension [Member] | U.S. Equities [Member] | Level 1 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | U.S. Equities [Member] | Level 2 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 43,058 |  | 36,848 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 43,058 |  | 36,848 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 43,058 |  | 36,848 |  |  |
Pension [Member] | U.S. Equities [Member] | Level 3 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | International Equities [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 12,243 |  | 11,095 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 12,243 |  | 11,095 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 12,243 |  | 11,095 |  |  |
Pension [Member] | International Equities [Member] | Level 1 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | International Equities [Member] | Level 2 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 12,243 |  | 11,095 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 12,243 |  | 11,095 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 12,243 |  | 11,095 |  |  |
Pension [Member] | International Equities [Member] | Level 3 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | Fixed Income [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 29,666 |  | 25,935 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 29,666 |  | 25,935 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 29,666 |  | 25,935 |  |  |
Pension [Member] | Fixed Income [Member] | Level 1 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Pension [Member] | Fixed Income [Member] | Level 2 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 29,666 |  | 25,935 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 29,666 |  | 25,935 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 29,666 |  | 25,935 |  |  |
Pension [Member] | Fixed Income [Member] | Level 3 [Member] |  |  |  |  |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  |  |
OPEB [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Employer contributions |  | 7,770 |  | 6,038 |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at beginning of period |  | 109,717 |  | 186,384 |  |  |
Service cost |  | 1,668 |  | 3,534 |  | 3,542 |
Interest cost |  | 5,728 |  | 10,402 |  | 11,007 |
Plan changes |  | 0 |  | (112,487) |  |  |
Medicare Part D |  | 160 |  | 538 |  |  |
Actuarial loss |  | 24,786 |  | 26,996 |  |  |
Benefits paid |  | (7,770) |  | (6,038) |  |  |
Curtailment/special termination benefits |  | 0 |  | 388 |  | 0 |
Benefit obligation at end of period |  | 134,289 |  | 109,717 |  | 186,384 |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of plan assets at beginning of period |  | 0 |  | 0 |  |  |
Actual return on plan assets |  | 0 |  | 0 |  |  |
Employer contributions |  | 7,770 |  | 6,038 |  |  |
Benefits paid |  | (7,770) |  | (6,038) |  |  |
Fair value of assets at end of period |  | 0 |  | 0 |  | 0 |
Funded status of plans [Abstract] |  |  |  |  |  |  |
Funded status |  | (134,289) |  | (109,717) |  |  |
Amounts Recognized in the Statement of Financial Position [Abstract] |  |  |  |  |  |  |
Current liabilities |  | (6,211) |  | (6,409) |  |  |
Non-current liabilities |  | (128,078) |  | (103,308) |  |  |
Net amount recognized |  | (134,289) |  | (109,717) |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Net loss (gain) |  | 89,420 |  | 79,697 |  |  |
Prior service cost (benefit) |  | (27,861) |  | (60,674) |  |  |
Total |  | 61,559 |  | 19,023 |  |  |
Net loss |  | 24,785 |  | 26,996 |  |  |
Prior service benefit arising during the period |  | 0 |  | (112,488) |  |  |
Amortization of net loss |  | (15,063) |  | (6,455) |  |  |
Amortization of prior service benefit (cost) |  | 32,814 |  | 10,879 |  |  |
Prior service cost (benefit) recognized due to plan amendments |  | 0 |  | 50,475 |  |  |
Total amount recognized in other comprehensive loss |  | 42,536 |  | (30,593) |  |  |
Net periodic benefit cost |  | (10,355) |  | (40,575) |  | 915 |
Total recognized in net periodic benefit cost and other comprehensive loss |  | 32,181 |  | (71,168) |  |  |
Projected Benefit Obligation |  | 134,289 |  | 109,717 |  | 186,384 |
Fair value of pension plan assets |  | 0 |  | 0 |  | 0 |
Expected OPEB benefits payments |  | 6,211 |  |  |  |  |
Net periodic benefit cost [Abstract] |  |  |  |  |  |  |
Service cost |  | 1,668 |  | 3,534 |  | 3,542 |
Interest cost |  | 5,728 |  | 10,402 |  | 11,007 |
Expected return on plan assets |  | 0 |  | 0 |  | 0 |
Amortization of prior service costs |  | (32,814) |  | (10,879) |  | (1,144) |
Amortization of net loss |  | 15,063 |  | 6,454 |  | 2,485 |
Net periodic benefit cost |  | (10,355) |  | 9,511 |  | 15,890 |
Special termination benefits |  | 0 |  | 388 |  | 0 |
Effect of plan amendments |  | 0 |  | (50,474) |  | 0 |
Curtailment cost |  | 0 |  | 0 |  | (14,975) |
Total net periodic benefit cost |  | (10,355) |  | (40,575) |  | 915 |
Amounts that will be amortized from Accumulated other comprehensive income (loss) in next fiscal year [Abstract] |  |  |  |  |  |  |
Estimated net loss (gain) expected to be amortized from accumulated other comprehensive income into net periodic benefit cost |  | 6,426 |  |  |  |  |
Estimated prior service cost (benefit) expected to be amortized from accumulated other comprehensive income into net periodic benefit cost |  | (4,250) |  |  |  |  |
Weighted average assumptions used in calculating benefit obligations [Abstract] |  |  |  |  |  |  |
Discount rate (in hundredths) |  | 4.25% |  | 5.26% |  |  |
Rate of compensation increase, year one (in hundredths) |  | 3.00% | [1] | 3.00% | [1] |  |
Rate of compensation increase, year two (in hundredths) |  | 4.00% | [1] | 3.00% | [1] |  |
Rate of compensation increase, years thereafter (in hundredths) |  | 4.00% | [1] | 4.00% | [1] |  |
Measurement date |  | 12/31/2011 |  | 12/31/2010 |  |  |
Weighted average assumptions used to determine net periodic benefit cost [Abstract] |  |  |  |  |  |  |
Measurement date |  | 12/31/2010 |  | 12/31/2009 |  | 12/31/2008 |
Fiscal year end |  | 12/31/2011 |  | 12/31/2010 |  | 12/31/2009 |
Discount rate (in hundredths) |  | 5.23% |  | 5.89% |  | 6.31% |
Rate of compensation increase (in hundredths) |  | 3.00% |  | 2.00% |  | 4.00% |
Rate of compensation increase, year two (in hundredths) |  | 3.00% |  | 3.00% |  |  |
Rate of compensation increase, years thereafter (in hundredths) |  | 4.00% |  | 4.00% |  |  |
Expected return on plan assets (in hundredths) |  | 0.00% |  | 0.00% |  | 0.00% |
Effect of the Medicare Part D subsidy on accumulated projected benefit obligation |  | 15,364 |  |  |  |  |
Percentage effect of the Medicare Part D subsidy on accumulated projected benefit obligation (in hundredths) |  | (11.00%) |  |  |  |  |
Medical cost inflation trend |  | Initially estimated to be 10, declining to 5 over six years and thereafter |  |  |  |  |
Defined Benefit Plan, Health Care Cost Trend Rate Assumed for Next Fiscal Year (in hundredths) |  | 10.00% |  |  |  |  |
Defined Benefit Plan, Ultimate Health Care Cost Trend Rate (in hundredths) |  | 5.00% |  |  |  |  |
Actual plan asset allocations [Abstract] |  |  |  |  |  |  |
Defined benefit plan net periodic benefit cost long-term rate of return on plan assets assumed (in hundredths) |  | 0.00% |  | 0.00% |  | 0.00% |
Expected future benefit payments |  | 6,211 |  |  |  |  |
Estimated future benefit payments [Abstract] |  |  |  |  |  |  |
2012 |  | 6,211 |  |  |  |  |
2013 |  | 5,402 |  |  |  |  |
2014 |  | 5,980 |  |  |  |  |
2015 |  | 6,510 |  |  |  |  |
2016 |  | 6,832 |  |  |  |  |
2017 - 2021 |  | 39,042 |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 0 |  | 0 |  | 0 |
Hourly Pension Plan [Member] |  |  |  |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at end of period |  | 75,216 |  | 61,291 |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 47,984 |  | 40,940 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Projected Benefit Obligation |  | 75,216 |  | 61,291 |  |  |
Accumulated Benefit Obligation |  | 74,545 |  | 61,276 |  |  |
Fair value of pension plan assets |  | 47,984 |  | 40,940 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 47,984 |  | 40,940 |  |  |
Salaried Pension Plan [Member] |  |  |  |  |  |  |
Change in benefit obligation [Roll Forward] |  |  |  |  |  |  |
Benefit obligation at end of period |  | 64,655 |  | 49,478 |  |  |
Change in plan assets [Roll Forward] |  |  |  |  |  |  |
Fair value of assets at end of period |  | 36,982 |  | 32,938 |  |  |
Amounts Recognized in accumulated other comprehensive loss (pre-tax) [Abstract] |  |  |  |  |  |  |
Projected Benefit Obligation |  | 64,655 |  | 49,478 |  |  |
Accumulated Benefit Obligation |  | 58,742 |  | 45,633 |  |  |
Fair value of pension plan assets |  | 36,982 |  | 32,938 |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |  |  |
Fair value of pension plan assets |  | 36,982 |  | 32,938 |  |  |
USWA ME Plan [Member] |  |  |  |  |  |  |
Defined Benefit Plans and Other Postretirement Benefit Plans Table Text Block [Line Items] |  |  |  |  |  |  |
Contributions to employees worker's union |  | 2,117 | [2],[3] | 1,306 | [2] | 1,352 | [2]
Withdrawal from Plan Probable |  | No |  |  |  |  |
Surcharge Imposed |  | No |  |  |  |  |
Expiration Date of Collective Bargaining Agreement |  | April 1, 2015 |  |  |  |  |
Funding percentage of plans in red zone |  | less than 65 percent funded |  |  |  |  |
Funding percentage of plans in yellow zone |  | less than 80 percent funded |  |  |  |  |
Funding percentage of plans in green zone |  | at least 80 percent funded |  |  |  |  |
Increase in number of union-represented employees at Hawesville (in hundredths) |  | 10.00% |  |  |  |  |
Threshold percentage for disclosure of total contributions to the plan (in hundredths) |  | 5.00% |  |  |  |  |
Estimated future benefit payments [Abstract] |  |  |  |  |  |  |
EIN / PN |  | 23-6648508/499 |  |  |  |  |
Pension Protection Act Zone Status |  | Green | [4] | Yellow | [4] |  |
Subject to Financial Improvement/Rehabilitation Plan |  | No |  |  |  |  |
Contributions of Century Aluminum |  | $ 2,117 | [2],[3] | $ 1,306 | [2] | $ 1,352 | [2]
[1] | Rate of compensation increase is for year 1/year 2/years thereafter.
[2] | Our contributions to the Steelworkers Pension Trust are not 5% or more of the total contributions to the plan.
[3] | The number of union-represented employees at Hawesville increased approximately 10% due to the restart of curtailed operations.
[4] | The most recent Pension Protection Act zone status available in 2011 and 2010 is for the plans' year-end December 31, 2010 and December 31, 2009, respectively. The zone status is based on information that Century received from the plan as well as publicly available information per the Department of Labor and is certified by the plan's actuary. Among other factors, plans in the red zone are generally less than 65 percent funded, plans in the yellow zone are less than 80 percent funded, and plans in the green zone are at least 80 percent funded.

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- Definition The amounts in accumulated other comprehensive income related to prior service cost or credit expected to be recognized as components of net periodic benefit cost over the next fiscal year that follows the most recent annual statement of financial position presented. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph s -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph d -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (s) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the prior service cost or credit recognized in net periodic benefit cost relating to benefit changes attributable to plan participants' prior service pursuant to a plan amendment or a plan initiation. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The aggregate net gain (loss) recognized in other comprehensive income, including amounts arising during the period and reclassification adjustments of other comprehensive income as a result of being recognized as components of net periodic benefit cost for the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph i -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 7 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The interest rate used to adjust for the time value of money for the plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(1) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Expected rate of compensation increases (for pay-related plans). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph j -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (k)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition 1) For defined benefit pension plans, the benefit obligation is the projected benefit obligation, which is the actuarial present value as of a date of all benefits attributed by the pension benefit formula to employee service rendered prior to that date. 2) For other postretirement defined benefit plans, the benefit obligation is the accumulated postretirement benefit obligation, which is the actuarial present value of benefits attributed to employee service rendered to a particular date. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Projected Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6522206 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Postretirement Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503904 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 6 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph E1 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The increase in the fair value of plan assets from contributions made by the employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The effect of a one-percentage-point increase in the assumed health care cost trend rates on the aggregate of the service and interest cost components of net periodic postretirement health care benefit costs. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph m -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (m) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of increase or decrease in net periodic benefit cost related to the effects of a change in the substantive terms of an existing defined benefit plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (r) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520782 -Topic 715 -SubTopic 30 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520743 -Topic 715 -SubTopic 60 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph r -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The employer's best estimate, as soon as it can be reasonably determined, of contributions expected to be paid to the plan during the next fiscal year beginning after the date of the latest statement of financial position. Estimated contributions may be presented in the aggregate combining (1) contributions required by funding regulations or laws, (2) discretionary contributions, and (3) noncash contributions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph g -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the aggregate benefits expected to be paid in the five fiscal years thereafter (the aggregate amount of benefits expected to be paid in years 6 through 10 after the date of the latest statement of financial position). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the benefits expected to be paid in Year 5. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the benefits expected to be paid in Year 4. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the benefits expected to be paid in Year 1. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the benefits expected to be paid in Year 3. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The amount of the benefits expected to be paid in Year 2. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph f -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (f) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition An amount calculated as a basis for determining the extent of delayed recognition of the effects of changes in the fair value of assets. The expected return on plan assets is determined based on the expected long-term rate of return on plan assets and the market-related value of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(3) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512136 -Topic 715 -SubTopic 30 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Expected Return on Plan Assets -URI http://asc.fasb.org/extlink&oid=6512171 -Topic 715 -SubTopic 60 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Assets, usually stocks, bonds, and other investments, that have been segregated and restricted (usually in a trust) to provide benefits, at their fair value as of the measurement date. Plan assets include amounts contributed by the employer (and by employees for a contributory plan) and amounts earned from investing the contributions, less benefits paid. If a plan has liabilities other than for benefits, those non-benefit obligations may be considered as reductions of plan assets. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 30 -Section 35 -Paragraph 50 -URI http://asc.fasb.org/extlink&oid=6867990&loc=d3e12355-114930 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d(iv)(b)(i) -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph b -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 49 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6410544&loc=d3e1703-114919 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition Amount of the period's gross receipts received from the prescription drug subsidy, which is to be used in the roll forward of the accumulated postretirement benefit obligation of an applicable postretirement benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 20, 21, 22 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition The assumed health care cost trend rate for the next year used to measure the expected cost of benefits covered by the plan (gross eligible charges). This is based upon the annual rate of change in the cost of health care benefits currently provided by the postretirement benefit plan, due to factors other than changes in the composition of the plan population by age and dependency status. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph l -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Health Care Cost Trend Rate -URI http://asc.fasb.org/extlink&oid=6514820 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (l) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 + Details
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- Definition The increase in a defined benefit pension plan's projected benefit obligation or a defined benefit postretirement plan's accumulated postretirement benefit obligation due to the passage of time. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a, h -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition The amount of increase or decrease due to a change in the terms of an existing plan or the initiation of a new plan. A plan amendment may increase or decrease benefits, including those attributed to years of service already rendered. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520782 -Topic 715 -SubTopic 30 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Plan Amendment -URI http://asc.fasb.org/extlink&oid=6520743 -Topic 715 -SubTopic 60 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(7) -URI http://asc.fasb.org/extlink&oid=6962843&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 106 -Paragraph 518 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 87 -Paragraph 264 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. + Details
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- Definition Amount of the reduction in the accumulated postretirement benefit obligation for the government subsidy related to prescription drug benefits attributed to past service. Disclosure relates to the first period in which an employer includes the effects of the subsidy in measuring the accumulated postretirement benefit obligation and net periodic postretirement benefit cost. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name FASB Staff Position (FSP) -Number FAS106-2 -Paragraph 21 -Subparagraph a -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39689-114964 + Details
Name: | us-gaap_PrescriptionDrugBenefitReductionInAccumulatedPostretirementBenefitObligationForSubsidy
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant