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Employee benefit plans | 9 Months Ended
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Sep. 30, 2014
Defined Benefit Plans and Other Postretirement Benefit Plans Disclosures [Abstract] |
Pension and other postretirement benefit plans | Employee benefit plans The Company has noncontributory defined benefit pension plans and other postretirement benefit plans for certain eligible employees. Components of net periodic benefit cost for the Company's pension and other postretirement benefit plans were as follows:
|  |  | Other
|  |  | Postretirement
| Pension Benefits | Benefits
Three Months Ended September 30, | 2014 |  | 2013 |  | 2014 |  | 2013 |
| (In thousands)
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | 32 |  | $ | 39 |  | $ | 379 |  | $ | 419 |
Interest cost | 4,420 |  | 4,062 |  | 919 |  | 804 |
Expected return on assets | (5,304 | ) | (4,979 | ) | (1,154 | ) | (1,086 | )
Amortization of prior service cost (credit) | 18 |  | 18 |  | (348 | ) | (364 | )
Amortization of net actuarial loss | 1,217 |  | 1,793 |  | 162 |  | 327 |
Net periodic benefit cost (credit), including amount capitalized | 383 |  | 933 |  | (42 | ) | 100 |
Less amount capitalized | 27 |  | 157 |  | (65 | ) | 47 |
Net periodic benefit cost | $ | 356 |  | $ | 776 |  | $ | 23 |  | $ | 53 |
|  |  | Other
|  |  | Postretirement
| Pension Benefits | Benefits
Nine Months Ended September 30, | 2014 |  | 2013 |  | 2014 |  | 2013 |
| (In thousands)
Components of net periodic benefit cost: |  |  |  |
Service cost | $ | 96 |  | $ | 116 |  | $ | 1,138 |  | $ | 1,257 |
Interest cost | 13,265 |  | 12,186 |  | 2,701 |  | 2,411 |
Expected return on assets | (15,913 | ) | (14,937 | ) | (3,463 | ) | (3,258 | )
Amortization of prior service cost (credit) | 54 |  | 54 |  | (1,044 | ) | (1,092 | )
Amortization of net actuarial loss | 3,651 |  | 5,373 |  | 486 |  | 1,405 |
Net periodic benefit cost (credit), including amount capitalized | 1,153 |  | 2,792 |  | (182 | ) | 723 |
Less amount capitalized | 195 |  | 425 |  | (55 | ) | 137 |
Net periodic benefit cost (credit) | $ | 958 |  | $ | 2,367 |  | $ | (127 | ) | $ | 586 |
In addition to the qualified plan defined pension benefits reflected in the table, the Company has unfunded, nonqualified benefit plans for executive officers and certain key management employees that generally provide for defined benefit payments at age 65 following the employee's retirement or to their beneficiaries upon death for a 15-year period. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2014, was $1.7 million and $5.0 million, respectively. The Company's net periodic benefit cost for this plan for the three and nine months ended September 30, 2013, was $1.8 million and $5.5 million, respectively.

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- Definition The entire disclosure for pension and other postretirement benefits. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414718&loc=d3e28014-114942 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=35743120&loc=d3e2410-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=35742057&loc=SL14450702-114947 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6414199&loc=d3e39622-114963 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39675-114964 + Details
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