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Pension and Other Postretirement Benefit Plans (Tables) | 6 Months Ended
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Jun. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Schedule of Components of Net Periodic Benefit Cost | The following table provides the components of net periodic benefit costs associated with our pension and other postretirement benefit plans for the three and six months ended June 30, 2015 and 2014 (in thousands):
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2015 |  | 2014 |  | 2015 |  | 2014
Pension and Other Postretirement Benefits: |  |  |  |  |  |  |
Interest cost | $ | 4,799 |  |  | $ | 4,900 |  |  | $ | 9,549 |  |  | $ | 9,802 |
Expected return on plan assets | (5,259 | ) |  | (6,025 | ) |  | (10,559 | ) |  | (12,050 | )
Amortization of prior service credit | (359 | ) |  | (358 | ) |  | (717 | ) |  | (716 | )
Amortization of actuarial loss, net | 1,798 |  |  | 1,167 |  |  | 3,523 |  |  | 2,334 |
Net periodic cost (credit) | $ | 979 |  |  | $ | (316 | ) |  | $ | 1,796 |  |  | $ | (630 | )

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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=35743120&loc=d3e1928-114920 + Details
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