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PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS (Tables) | 6 Months Ended
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Jun. 30, 2013
PENSION AND OTHER POSTRETIREMENT BENEFIT PLANS |
Summary of the components of net periodic benefit cost |
|  | Three Months Ended June 30 |
|  | Nonunion Defined |  | Supplemental |  | Postretirement |
|  | Benefit Pension Plan |  | Benefit Pension Plan |  | Health Benefit Plan |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  | (in thousands) |
Service cost |  | $ | 2,367 |  | $ | 2,297 |  | $ | — |  | $ | — |  | $ | 83 |  | $ | 78 |
Interest cost |  | 1,922 |  | 2,173 |  | 38 |  | 53 |  | 187 |  | 188 |
Expected return on plan assets |  | (3,155 | ) | (3,016 | ) | — |  | — |  | — |  | — |
Amortization of prior service credit |  | — |  | — |  | — |  | — |  | (47 | ) | (47 | )
Amortization of net actuarial loss and other |  | 2,714 |  | 2,692 |  | 65 |  | 50 |  | 133 |  | 104 |
Net periodic benefit cost |  | $ | 3,848 |  | $ | 4,146 |  | $ | 103 |  | $ | 103 |  | $ | 356 |  | $ | 323 |
|  | Six Months Ended June 30 |
|  | Nonunion Defined |  | Supplemental |  | Postretirement |
|  | Benefit Pension Plan |  | Benefit Pension Plan |  | Health Benefit Plan |
|  | 2013 |  | 2012 |  | 2013 |  | 2012 |  | 2013 |  | 2012 |
|  | (in thousands) |
Service cost |  | $ | 4,734 |  | $ | 4,594 |  | $ | — |  | $ | — |  | $ | 166 |  | $ | 157 |
Interest cost |  | 3,845 |  | 4,346 |  | 75 |  | 105 |  | 375 |  | 375 |
Expected return on plan assets |  | (6,309 | ) | (6,032 | ) | — |  | — |  | — |  | — |
Amortization of prior service credit |  | — |  | — |  | — |  | — |  | (95 | ) | (95 | )
Amortization of net actuarial loss and other |  | 5,427 |  | 5,384 |  | 130 |  | 101 |  | 267 |  | 208 |
Net periodic benefit cost |  | $ | 7,697 |  | $ | 8,292 |  | $ | 205 |  | $ | 206 |  | $ | 713 |  | $ | 645 |
Schedule of changes in the PBO, plan assets, funded status, and accumulated benefit obligation of nonunion defined benefit pension plan |
|  | Nonunion Defined |
|  | Benefit Pension Plan |
|  | (in thousands) |
Change in projected benefit obligation |  |  |
Projected benefit obligation at December 31, 2012 |  | $ | 260,950 |
Service cost |  | 4,734 |
Interest cost |  | 3,845 |
Actuarial gain and other(1) |  | (10,747 | )
Benefits paid |  | (10,745 | )
Curtailment |  | (29,262 | )
Projected benefit obligation at June 30, 2013 |  | 218,775 |
Change in plan assets |  |  |
Fair value of plan assets at December 31, 2012 |  | 181,225 |
Actual return on plan assets |  | 12,575 |
Employer contributions |  | 9,000 |
Benefits paid |  | (10,745 | )
Fair value of plan assets at June 30, 2013 |  | 192,055 |
Funded status at June 30, 2013(2) |  | $ | (26,720 | )
Accumulated benefit obligation |  | $ | 218,775 |
(1) Net actuarial gain from remeasurement upon curtailment was impacted by an actual return on plan assets during the first six months of 2013 that exceeded the assumed annualized return rate of 7.5% combined with an increase in discount rates since the last measurement date. The discount rate used to remeasure the PBO was 3.9% compared to a rate of 3.1% as of the December 31, 2012 measurement date. (2) Noncurrent liability recognized within pension and postretirement liabilities in the accompanying consolidated balance sheet at June 30, 2013.

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- Definition Tabular disclosure of net funded status of pension plans and/or other employee benefit plans and disclosure of accumulated benefit obligation. + References No definition available. + 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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