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Postretirement Medical Benefits (Tables) | 12 Months Ended
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Dec. 31, 2012
Postretirement Medical Benefits [Abstract] |
Schedule of net periodic benefit costs | Net periodic benefit cost related to our plans includes the following components (in thousands):
|  | December 31, |
U.S. postretirement plan: |  | 2012 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 4 |  |  | $ | 69 |  |  | $ | 179 |
Interest cost |  |  | 81 |  |  |  | 527 |  |  |  | 1,156 |
Amortization of prior service cost |  |  | (4,752 | ) |  |  | (6,433 | ) |  |  | (9,012 | )
Amortization of unrecognized loss |  |  | 2,887 |  |  |  | 2,246 |  |  |  | 1,348 |
Curtailment gain |  |  | - |  |  |  | (3,495 | ) |  |  | - |
Net periodic benefit cost |  | $ | (1,780 | ) |  | $ | (7,086 | ) |  | $ | (6,329 | )
Canadian postretirement plan: |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | - |  |  | $ | 7 |  |  | $ | 13 |
Interest cost |  |  | 5 |  |  |  | 23 |  |  |  | 50 |
Amortization of transition obligation |  |  | - |  |  |  | 2 |  |  |  | 4 |
Amortization of prior service cost |  |  | (142 | ) |  |  | (80 | ) |  |  | (18 | )
Amortization of net actuarial loss |  |  | (52 | ) |  |  | (43 | ) |  |  | (13 | )
Curtailment gain |  |  | - |  |  |  | (152 | ) |  |  | - |
Net periodic benefit cost |  | $ | (189 | ) |  | $ | (243 | ) |  | $ | 36 |
Total net periodic benefit costs |  | $ | (1,969 | ) |  | $ | (7,329 | ) |  | $ | (6,293 | )
One-percentage-point change in assumed health care cost trend rate | Assumed health care cost trend rates have a significant effect on the amounts reported for the health care plans. A one-percentage-point change in assumed health care cost trend rates would have the following effects for 2013 (in thousands):
|  | 1-Percentage- Point Increase |  |  | 1-Percentage- Point Decrease |
Effect on total of service and interest cost components |  | $ | 1 |  |  | $ | (1 | )
Effect on postretirement benefit obligation |  |  | 37 |  |  |  | (36 | )
Postretirement Benefits [Member] |
Defined Benefit Plan Disclosure [Line Items] |
Schedule of funded (unfunded) status | The benefit obligation, funded status, and amounts recognized in the consolidated financial statements for our postretirement medical benefit plans as of and for the years ended December 31, 2012 and 2011, were as follows (in thousands):
|  | Postretirement Benefit Plans |
|  | U.S. Plan |  |  | Canadian Plan |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Change in benefit obligation: |  |  |  |  |  |  |  |  |  |  |  |
Benefit obligation at beginning of year |  | $ | 6,955 |  |  | $ | 22,169 |  |  | $ | 192 |  |  | $ | 774 |
Service cost |  |  | 4 |  |  |  | 69 |  |  |  | - |  |  |  | 7 |
Interest cost |  |  | 81 |  |  |  | 527 |  |  |  | 5 |  |  |  | 23 |
Benefits paid |  |  | (751 | ) |  |  | (833 | ) |  |  | (24 | ) |  |  | (28 | )
Actuarial loss (gain) |  |  | (339 | ) |  |  | (1,267 | ) |  |  | (21 | ) |  |  | 131 |
Plan amendment |  |  | - |  |  |  | (13,710 | ) |  |  | - |  |  |  | (705 | )
Translation adjustment |  |  | - |  |  |  | - |  |  |  | 4 |  |  |  | (10 | )
Benefit obligation at end of year |  | $ | 5,950 |  |  | $ | 6,955 |  |  | $ | 156 |  |  | $ | 192 |
(Unfunded) status of the plans |  | $ | (5,950 | ) |  | $ | (6,955 | ) |  | $ | (156 | ) |  | $ | (192 | )
Schedule of amounts recognized in balance sheet |
|  | Postretirement Benefit Plans |
|  | U.S. Plan |  |  | Canadian Plan |
|  | 2012 |  |  | 2011 |  |  | 2012 |  |  | 2011 |
Amounts recognized in the balance sheet: |  |  |  |  |  |  |  |  |  |  |  |
Accrued postretirement benefit liabilities |  | $ | 5,950 |  |  | $ | 6,955 |  |  | $ | 156 |  |  | $ | 192 |
Accumulated other comprehensive (income) loss (pre-tax) related to: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unrecognized net actuarial losses (gains) |  |  | 7,809 |  |  |  | 11,035 |  |  |  | (254 | ) |  |  | (280 | )
Unrecognized prior service cost (credit) |  |  | (7,094 | ) |  |  | (11,846 | ) |  |  | (504 | ) |  |  | (633 | )
Schedule of actuarial assumptions used to determine costs and benefit obligations | Actuarial assumptions used to determine costs and benefit obligations related to our U.S. postretirement plan are as follows:
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Discount rate |  |  | 0.55 | % |  |  | 1.30 | % |  |  | 5.35 | %
Actuarial assumptions used to determine costs and benefit obligations related to our Canadian postretirement plan are as follows:
|  | December 31, |
|  | 2012 |  |  | 2011 |  |  | 2010 |
Discount rates |  |  | 3.00 | % |  |  | 3.00 | % |  |  | 5.00 | %
Current medical cost trend rate |  |  | 8.57 | % |  |  | 9.29 | % |  |  | 10 | %
Ultimate medical cost trend rate |  |  | 5 | % |  |  | 5 | % |  |  | 5 | %
Year trend rate declines to ultimate |  |  | 2017 |  |  |  | 2017 |  |  |  | 2017 |
Schedule of expected future benefit payments | The following benefit payments which reflect expected future service, as appropriate, are expected to be paid (in thousands):
2013 |  | $ | 1,980 |
2014 |  |  | 1,187 |
2015 |  |  | 1,215 |
2016 |  |  | 1,268 |
2017 |  |  | 62 |
Years 2018 – 2022 |  |  | 198 |

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- Definition Tabular disclosure of the amounts that are recognized in the balance sheet (or statement of financial position) for pension plans and/or other employee benefit plans, showing separately the assets and current and noncurrent liabilities (if applicable) recognized. + 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 (c) -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 costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: 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 + 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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