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Components of Net Periodic Benefit Cost | 6 Months Ended
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Jun. 30, 2011
Notes to Financial Statements [Abstract] |
Components of Net Periodic Benefit Cost |
|  | Pension Benefits |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 709 |  |  | $ | 749 |  |  | $ | 1,566 |  |  | $ | 1,489 |
Interest cost |  |  | 1,808 |  |  |  | 1,611 |  |  |  | 3,488 |  |  |  | 3,204 |
Expected return on plan assets |  |  | (1,776 | ) |  |  | (1,465 | ) |  |  | (3,315 | ) |  |  | (2,688 | )
Amortization of prior service cost |  |  | 34 |  |  |  | 34 |  |  |  | 69 |  |  |  | 69 |
Amortization of net loss |  |  | 449 |  |  |  | 407 |  |  |  | 931 |  |  |  | 830 |
Net periodic benefit cost |  | $ | 1,224 |  |  | $ | 1,336 |  |  | $ | 2,739 |  |  | $ | 2,904 |
|  | Other Postretirement Benefits |
|  | Three months ended June 30, |  |  | Six months ended June 30, |
|  | 2011 |  |  | 2010 |  |  | 2011 |  |  | 2010 |
Service cost |  | $ | 475 |  |  | $ | 738 |  |  | $ | 834 |  |  | $ | 1,760 |
Interest cost |  |  | 1,478 |  |  |  | 2,747 |  |  |  | 2,864 |  |  |  | 5,497 |
Expected return on plan assets |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |
Amortization of prior service cost (1) |  |  | (15,534 | ) |  |  | (300 | ) |  |  | (30,689 | ) |  |  | (560 | )
Amortization of net loss |  |  | 6,546 |  |  |  | 844 |  |  |  | 12,349 |  |  |  | 1,602 |
Net periodic benefit cost |  | $ | (7,035 | ) |  | $ | 4,029 |  |  | $ | (14,642 | ) |  | $ | 8,299 |
(1) | OPEB plan amendments in November 2010 resulted in the immediate recognition of any unamortized prior service cost benefits that were accrued in accumulated other comprehensive loss as of the date of the amendments. In addition, the November 2010 plan amendments resulted in a reduction in OPEB liability and a credit to accumulated other comprehensive loss. The resulting prior service benefit and actuarial losses were amortized ratably into income over the period November 1, 2010 to June 30, 2011 at which time the CAWV OPEB plan terminated.
Employer contributions In June 2011, the election of three directors designated for nomination to our Board of Directors by Glencore triggered a “change of control” under the terms of our non-qualified Supplemental Retirement Income Benefit Plan (“SERB”) plan. As a result of the change in control, we were required to make an approximately $16,700 contribution to a Rabbi trust to fully fund the non-qualified SERB benefit obligation. In addition, through June 30, 2011, we have made contributions of approximately $14,400 to the qualified defined benefit plans we sponsor. Based on current actuarial and other assumptions, we expect to make additional contributions to these qualified defined benefit plans of approximately $3,400 during 2011 for a total of approximately $34,500 in qualified defined benefit plan and non-qualified SERB contributions during the year.

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- Definition This element may be used to capture the entire disclosure for an employer that sponsors one or more defined benefit pension plans or one or more other defined benefit postretirement plans, of certain information, 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 132R -Paragraph 5, 6, 7 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 132R -Paragraph 5 -Subparagraph d Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 158 -Paragraph 4, 7, 16, 20, 21 + Details
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