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Employee Benefit Plans - Changes in Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Components of Net Periodic Postretirement Benefit Cost |  |  |
Service cost | $ 1,776 | $ 1,508 | $ 2,323
Interest cost | 1,172 | 1,097 | 1,498
Amortization of prior service cost | (709) | (1,183) | 111
Net periodic postretirement cost | 2,239 | 1,422 | 3,932
Recognized curtailment gain | 0 | (4,917) | 0
Total post retirement cost (income) | 2,239 | (3,495) | 3,932
Other Changes in Benefit Obligations Recognized in Other Comprehensive Income (Loss) |  |  |
Net (gain) loss | (3,165) | 4,178 | (2,846)
Prior service cost | 0 | (8,643) | 815
Amortization of prior service cost | 709 | 2,733 | (111)
Total recognized in other comprehensive income | (2,456) | (1,732) | (2,142)
Total recognized in net periodic benefit cost (income) and other comprehensive income | $ (217) | $ (5,227) | $ 1,790

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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=112275985&loc=d3e4179-114921 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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