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Pension and Employee Benefit Plans | 9 Months Ended
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Sep. 30, 2015
Compensation and Retirement Disclosure [Abstract] |
Pension and Employee Benefit Plans |
12. | Pension and Employee Benefit Plans
We sponsor several non-contributory defined benefit pension plans for certain union employees. All plans are funded in accordance with the funding requirements of the Employee Retirement Income Security Act of 1974. We also sponsor a postretirement health care plan for office employees retired before January 1, 1990. The plan allowed retirees who attained the age of 65 to elect the type of coverage desired. Retirement and health care plan expense is based on valuations performed by plan actuaries as of the beginning of each fiscal year. The components of the expense consisted of the following:
(Table only in thousands) |  | Three Months Ended September 30, |  |  | Nine Months Ended September 30, |
|  | 2015 |  |  | 2014 |  |  | 2015 |  |  | 2014 |
Pension plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Service cost |  | $ | 58 |  |  | $ | 50 |  |  | $ | 175 |  |  | $ | 150 |
Interest cost |  |  | 354 |  |  |  | 357 |  |  |  | 1,060 |  |  |  | 1,071 |
Expected return on plan assets |  |  | (502 | ) |  |  | (488 | ) |  |  | (1,507 | ) |  |  | (1,464 | )
Amortization of net actuarial loss |  |  | 65 |  |  |  | 44 |  |  |  | 194 |  |  |  | 132 |
Net periodic benefit gain |  | $ | (25 | ) |  | $ | (37 | ) |  | $ | (78 | ) |  | $ | (111 | )
Health care plan: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest cost |  | $ | 1 |  |  | $ | 1 |  |  | $ | 4 |  |  | $ | 3 |
Amortization of loss (gain) |  |  | 2 |  |  |  | (1 | ) |  |  | 5 |  |  |  | (3 | )
Net periodic benefit cost (gain) |  | $ | 3 |  |  | $ | — |  |  | $ | 9 |  |  | $ | — |
We made contributions to our defined benefit plans during the nine months ended September 30, 2015 and 2014 totaling $0.4 million and $1.4 million, respectively. We anticipate contributing $0.2 million to fund the pension plans and $25,000 for the retiree health care plan during the remainder of 2015. The unfunded liability of the plans of $10.7 million and $11.1 million as of September 30, 2015 and December 31, 2014, respectively, is included in Other Liabilities on our Condensed Consolidated Balance Sheets.

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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 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450702-114947 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=58740216&loc=d3e2410-114920 Reference 3: 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 Reference 4: 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=49170846&loc=d3e28014-114942 Reference 5: 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 + Details
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