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Retirement Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2012
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Defined Benefit Plans Disclosures | The following tables set forth the change in plan assets, change in projected benefit obligation, rate assumptions and components of net periodic benefit cost as of December 31 with respect to these plans. The measurement dates of the assets and liabilities of both plans were December 31 of the respective years presented.
|  | Year Ended December 31, 2012
(in thousands) |  | Hourly Employees’ Pension Plan | Employees’ Retirement Plan | Total
Change in projected benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 10,454 |  | $ | 19,238 |  | $ | 29,692 |
Service cost |  | 10 |  | 4 |  | 14 |
Interest cost |  | 411 |  | 788 |  | 1,199 |
Liability actuarial (gain)/loss |  | 549 |  | 1,619 |  | 2,168 |
Benefits paid |  | (638 | ) | (726 | ) | (1,364 | )
Benefit obligation at end of year |  | 10,786 |  | 20,923 |  | 31,709 |
Change in fair value of plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 6,663 |  | 12,237 |  | 18,900 |
Return on plan assets |  | 937 |  | 1,722 |  | 2,659 |
Employer contributions |  | 728 |  | 915 |  | 1,643 |
Benefits paid |  | (638 | ) | (726 | ) | (1,364 | )
Fair value of plan assets at end of year |  | 7,690 |  | 14,148 |  | 21,838 |
Underfunded status – December 31, 2012 |  | $ | (3,096 | ) | $ | (6,775 | ) | $ | (9,871 | )
Accumulated benefit obligation – December 31, 2012 |  | $ | 10,786 |  | $ | 20,923 |  | $ | 31,709 |
|  | Year Ended December 31, 2011
(in thousands) |  | Hourly Employees’ Pension Plan | Employees’ Retirement Plan | Total
Change in projected benefit obligation |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 9,511 |  | $ | 16,427 |  | $ | 25,938 |
Service cost |  | 8 |  | 4 |  | 12 |
Interest cost |  | 469 |  | 858 |  | 1,327 |
Liability actuarial (gain)/loss |  | 1,098 |  | 2,651 |  | 3,749 |
Benefits paid |  | (632 | ) | (702 | ) | (1,334 | )
Benefit obligation at end of year |  | 10,454 |  | 19,238 |  | 29,692 |
Change in fair value of plan assets |  |  |  |
Fair value of plan assets at beginning of year |  | 6,303 |  | 12,485 |  | 18,788 |
Return on plan assets |  | (73 | ) | (65 | ) | (138 | )
Employer contributions |  | 1,065 |  | 519 |  | 1,584 |
Benefits paid |  | (632 | ) | (702 | ) | (1,334 | )
Fair value of plan assets at end of year |  | 6,663 |  | 12,237 |  | 18,900 |
Underfunded status – December 31, 2011 |  | $ | (3,791 | ) | $ | (7,001 | ) | $ | (10,792 | )
Accumulated benefit obligation – December 31, 2011 |  | $ | 10,454 |  | $ | 19,238 |  | $ | 29,692 |
Schedule of Assumptions Used | Assumptions used to determine benefit obligations at December 31:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2012 | 2011 |  | 2012 | 2011
Discount rate |  | 3.55% | 4.06% |  | 3.70% | 4.18%
Composite rate of compensation increase |  | N/A | N/A |  | N/A | N/A
Assumptions used to determine net periodic benefit cost for the years ended December 31:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2012 | 2011 |  | 2012 | 2011
Discount rate |  | 4.06% | 5.12% |  | 4.18% | 5.30%
Long-term rate of return on plan assets |  | 7.75% | 7.75% |  | 7.75% | 7.75%
Composite rate of compensation increase |  | N/A | N/A |  | N/A | N/A
Schedule of Net Benefit Costs | The following tables present the components of net periodic benefit cost (gains are denoted with parentheses and losses are not):
|  | Year Ended December 31, 2012
(in thousands) |  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan |  | Total
Service cost |  | $ | 10 |  |  | $ | 4 |  |  | $ | 14 |
Interest cost |  | 411 |  |  | 788 |  |  | 1,199 |
Expected return on plan assets |  | (520 | ) |  | (951 | ) |  | (1,471 | )
Amortization of prior service cost |  | — |  |  | — |  |  | — |
Amortization of net (gain)/loss |  | 280 |  |  | 379 |  |  | 659 |
Net periodic benefit cost |  | $ | 181 |  |  | $ | 220 |  |  | $ | 401 |
|  | Year Ended December 31, 2011
(in thousands) |  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan |  | Total
Service cost |  | $ | 8 |  |  | $ | 4 |  |  | $ | 12 |
Interest cost |  | 469 |  |  | 858 |  |  | 1,327 |
Expected return on plan assets |  | (514 | ) |  | (963 | ) |  | (1,477 | )
Amortization of prior service cost |  | — |  |  | — |  |  | — |
Amortization of net (gain)/loss |  | 117 |  |  | 77 |  |  | 194 |
Net periodic benefit cost |  | $ | 80 |  |  | $ | (24 | ) |  | $ | 56 |
Schedule of Allocation of Plan Assets | The pension plans' weighted-average asset allocations as a percentage of plan assets at December 31 are as follows:
|  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan
|  | 2012 | 2011 |  | 2012 | 2011
Equity securities |  | 55% | 56% |  | 55% | 56%
Debt securities |  | 38% | 38% |  | 38% | 38%
Short-term investments |  | 2% | 1% |  | 2% | 1%
Other |  | 5% | 5% |  | 5% | 5%
Total |  | 100% | 100% |  | 100% | 100%
Fair Value, Assets Measured on Recurring Basis | The following table presents the hierarchy levels for our postretirement benefit plan investments as of December 31:
(in thousands) | December 31, 2012 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Mutual Funds: |  |  |  |
Small Cap | $ | — |  | $ | — |  | $ | — |  | $ | — |
Mid Cap | 1,376 |  | 1,376 |  |  |
Large Cap | 7,126 |  | 7,126 |  |  |
International | 2,201 |  | 2,201 |  |  |
Common/Collective: |  |  |  |
Liability Driven Solution | 3,074 |  |  |  | 3,074 |  |  |
Wells Fargo International Equity Index Fund | 1,097 |  |  | 1,097 |  |
Wells Fargo Thornburg International | 1,103 |  |  | 1,103 |  |
Wells Fargo Large Cap Growth Index Fund | 1,216 |  |  | 1,216 |  |
Wells Fargo Large Cap Value Index Fund | 1,210 |  |  | 1,210 |  |
Wells Fargo Multi-Manager Small Cap | 1,481 |  |  | 1,481 |  |
Wells Fargo Russell 2000 Index Fund | 708 |  |  | 708 |  |
Wells Fargo S&P Mid Cap Index Fund | 825 |  |  | 825 |  |
Cash & Short-term Investments | 421 |  | 421 |  |  |
Total | $ | 21,838 |  | $ | 11,124 |  | $ | 10,714 |  | $ | — |
(in thousands) | December 31, 2011 | Quoted Prices in Active Markets for Identical Assets (Level 1) | Significant Other Observable Inputs (Level 2) | Significant Unobservable Inputs (Level 3)
Mutual Funds: |  |  |  |
Small Cap | $ | 1,321 |  | $ | 1,321 |  | $ | — |  | $ | — |
Mid Cap | 1,238 |  | 1,238 |  |  |
Large Cap | 7,130 |  | 7,130 |  |  |
International | 1,835 |  | 1,835 |  |  |
Common/Collective: |  |  |  |
Liability Driven Solution | 2,614 |  | — |  | 2,614 |  | — |
Wells Fargo International Equity Index Fund | 906 |  |  | 906 |  |
Wells Fargo Large Cap Growth Index Fund | 1,085 |  |  | 1,085 |  |
Wells Fargo Large Cap Value Index Fund | 1,108 |  |  | 1,108 |  |
Wells Fargo Russell 2000 Index Fund | 656 |  |  | 656 |  |
Wells Fargo S&P Mid Cap Index Fund | 734 |  |  | 734 |  |
Cash & Short-term Investments | 265 |  | 265 |  |  |
Total | $ | 18,892 |  | $ | 11,789 |  | $ | 7,103 |  | $ | — |
Schedule of Expected Benefit Payments | The following table illustrates the estimated pension benefit payments which reflect expected future service, as appropriate, that are projected to be paid:
(in thousands) |  | Hourly Employees’ Pension Plan |  | Employees’ Retirement Plan |  | Total
2013 |  | $ | 654 |  |  | $ | 798 |  |  | $ | 1,452 |
2014 |  | 653 |  |  | 861 |  |  | 1,514 |
2015 |  | 643 |  |  | 891 |  |  | 1,534 |
2016 |  | 644 |  |  | 927 |  |  | 1,571 |
2017 |  | 645 |  |  | 1,017 |  |  | 1,662 |
Years 2018 through 2022 |  | $ | 3,214 |  |  | $ | 5,938 |  |  | $ | 9,152 |
Supplemental Employee Retirement Plans, Defined Benefit |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of Assumptions Used | Assumptions used to determine benefit obligations at December 31:
|  | 2012 | 2011
Discount rate |  | 3.37% | 4.04%
Composite rate of compensation increase |  | 3.00% | 3.00%
Assumptions used to determine net periodic benefit cost for the years ended December 31:
|  | 2012 | 2011
Discount rate |  | 4.04% | 5.28%
Composite rate of compensation increase |  | 3.00% | 3.00%
Long-term rate of return on plan assets |  | N/A | N/A
Schedule of Net Benefit Costs | The components of net periodic pension expense were as follows in thousands:
|  | Year Ended December 31,
(in thousands) |  | 2012 |  | 2011
Service Cost |  | $ | 101 |  |  | $ | 108 |
Interest Cost |  | 104 |  |  | 103 |
Amortization of Prior Service Cost |  | 287 |  |  | 264 |
Net Periodic Benefit Cost |  | $ | 492 |  |  | $ | 475 |
Schedule of Expected Benefit Payments | Future estimated benefits expected to be paid from the plan over the next ten years as follows in thousands:
2013 | $ | 41 |
2014 | 43 |
2015 | 50 |
2016 | 99 |
2017 | 137 |
Years 2018 through 2022 | $ | 1,229 |
Schedule of Defined Benefit Plans Disclosures | The change in the Projected Benefit Obligation (PBO) as of December 31, 2012 and 2011 is shown below in thousands:
|  | Year Ended December 31, |
(in thousands) |  | 2012 |  | 2011
Benefit obligation at January 1, |  | $ | 2,584 |  |  | $ | — |
Service cost |  | 101 |  |  | 108 |
Interest cost |  | 104 |  |  | 103 |
Liability actuarial (gain)/loss |  | 268 |  |  | 409 |
Plan Amendments |  | — |  |  | 1,964 |
Benefit obligation at December 31, |  | $ | 3,057 |  |  | $ | 2,584 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 6 -Footnote 4 -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 157 -Paragraph 32 -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 820 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19190-110258 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a),(b) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of the major categories of plan assets of pension plans and/or other employee benefit plans. This information may include, but is not limited to, the target allocation of plan assets, the fair value of each major category of plan assets, and the level within the fair value hierarchy in which the fair value measurements fall. + 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 (d)(5) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the assumptions used to determine for pension plans and/or other employee benefit plans the benefit obligation and net benefit cost, including assumed discount rates, rate increase in compensation increase, and expected long-term rates of return on 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 (k) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the change in the benefit obligation of pension plans and/or other employee benefit plans from the beginning to the end of the period, showing separately, if applicable, the effects of the following: service cost, interest cost, contributions by plan participants, actuarial gains and losses, foreign currency exchange rate changes, benefits paid, plan amendments, business combinations, divestitures, curtailments, settlements, and special and contractual termination benefits. + 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) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of one or more of the entity's defined benefit pension plans or one or more other defined benefit postretirement plans, separately for pension plans and other postretirement benefit plans including the entity's schedule of fair value of plan assets for defined benefit or other postretirement plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 -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 3 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2417-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=21916443&loc=d3e4179-114921 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -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 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2410-114920 Reference 7: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e2439-114920 Reference 8: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5, 6, 7 -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 Tabular disclosure of benefits expected to be paid by pension plans and/or other employee benefit plans in each of the next five fiscal years and in the aggregate for the five fiscal years thereafter. + 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 (f) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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- Definition Tabular disclosure of the components of net benefit costs for pension plans and/or other employee benefit plans including service cost, interest cost, expected return on plan assets, gain (loss), prior service cost or credit, transition asset or obligation, and gain (loss) recognized due to settlements or curtailments. + 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) -URI http://asc.fasb.org/extlink&oid=21915506&loc=d3e1928-114920 + Details
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