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Benefit Plans (Tables) | 9 Months Ended
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Sep. 30, 2016
Compensation and Retirement Disclosure [Abstract] |
Components of net periodic benefit cost | The following tables provide the components of net periodic benefit cost for our pension, supplemental executive retirement and other postretirement benefit plans for three and nine months ended September 30, 2016 and 2015:
|  | Three Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 2,283 |  |  | $ | 2,564 |  |  | $ | 188 |  |  | $ | 208 |
Interest cost |  | 3,976 |  |  | 3,962 |  |  | 176 |  |  | 174 |
Expected return on plan assets |  | (4,877 | ) |  | (5,278 | ) |  | (1,222 | ) |  | (1,248 | )
Recognized net actuarial loss (gain) |  | 1,464 |  |  | 1,372 |  |  | — |  |  | (44 | )
Amortization of prior service cost |  | (172 | ) |  | (211 | ) |  | (1,662 | ) |  | (1,661 | )
Net periodic benefit cost (benefit) |  | $ | 2,674 |  |  | $ | 2,409 |  |  | $ | (2,520 | ) |  | $ | (2,571 | )
|  | Nine Months Ended September 30,
|  | Pension and Supplemental Executive Retirement Plans |  | Other Postretirement Benefit Plans
(In thousands) |  | 2016 |  | 2015 |  | 2016 |  | 2015
Service cost |  | $ | 6,848 |  |  | $ | 7,692 |  |  | $ | 564 |  |  | $ | 624 |
Interest cost |  | 11,929 |  |  | 11,886 |  |  | 528 |  |  | 523 |
Expected return on plan assets |  | (14,631 | ) |  | (15,832 | ) |  | (3,665 | ) |  | (3,743 | )
Recognized net actuarial loss (gain) |  | 4,392 |  |  | 4,114 |  |  | — |  |  | (132 | )
Amortization of prior service cost |  | (515 | ) |  | (633 | ) |  | (4,987 | ) |  | (4,986 | )
Net periodic benefit cost (benefit) |  | $ | 8,023 |  |  | $ | 7,227 |  |  | $ | (7,560 | ) |  | $ | (7,714 | )

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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=58740216&loc=d3e1928-114920 + Details
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