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Components of Net Periodic Benefit Cost (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016 | Dec. 31, 2016
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year |  |  |  |  | $ 2,500
Post-Retirement Health Benefits [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Defined Benefits Plan Estimated Future Employer Contributions In Next Fiscal Year |  |  |  |  | $ 260
Service cost | $ 13 | $ 14 | $ 26 | $ 27 |
Interest cost | 43 | 46 | 86 | 93 |
Expected return on plan assets | 0 | 0 | 0 | 0 |
Amortization of transition obligation | 0 | 0 | 0 | 0 |
Net amortization of prior service cost | 0 | 0 | 0 | 0 |
Net amortization of net (gain) loss | 0 | 0 | 0 | 0 |
Net Periodic Benefit Cost | 56 | 60 | 112 | 120 |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | 111 |  |
Pension Plan [Member] |  |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |  |
Service cost | 358 | 470 | 716 | 941 |
Interest cost | 905 | 932 | 1,810 | 1,865 |
Expected return on plan assets | (985) | (857) | (1,970) | (1,715) |
Amortization of transition obligation | 0 | 0 | 0 | 0 |
Net amortization of prior service cost | 0 | 0 | 0 | 0 |
Net amortization of net (gain) loss | 301 | 484 | 602 | 967 |
Net Periodic Benefit Cost | $ 579 | $ 1,029 | 1,158 | $ 2,058 |
Defined Benefit Plan, Plan Assets, Contributions by Employer |  |  | $ 977 |  |

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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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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/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of transition asset (obligation) recognized in net periodic benefit (cost) credit of defined benefit plan. + 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)(6) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of contribution received by defined benefit plan from employer which increases plan assets. + 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 (d)(5)(ii) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2709-114920 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(5)(iv)(01) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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