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Pension and Postretirement Plans (Total Benefit/Cost) (Details 1) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Net Periodic Cost (Benefit) | $ 4,963 | $ 4,317 | $ 10,184 | $ 9,257
Defined Benefit Pension Plan [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 4,963 | 4,317 | 10,184 | 9,257
Interest cost | 11,743 | 11,844 | 23,335 | 23,099
Expected return on assets | (30,285) | (32,796) | (61,123) | (65,282)
Amortization of prior service cost (credit) | 825 | 36 | 1,234 | 78
Recognized actuarial loss (gain) | 37 | (2,974) | 0 | (4,020)
Net Periodic Cost (Benefit) | (12,717) | (19,573) | (26,370) | (36,868)
Curtailment gain | 0 | 0 | 0 | (806)
Special separation benefit expense | 6,607 | 0 | 6,607 | 0
Net Periodic Cost (Benefit) | (6,110) | (19,573) | (19,763) | (37,674)
Supplemental Executive Retirement Plan (SERP) [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 215 | 204 | 429 | 409
Interest cost | 1,079 | 966 | 2,157 | 1,932
Amortization of prior service cost (credit) | 84 | 78 | 169 | 156
Recognized actuarial loss (gain) | 578 | 601 | 1,157 | 1,202
Net Periodic Cost (Benefit) | 1,956 | 1,849 | 3,912 | 3,699
Other Postretirement Plans [Member] |  |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |  |
Service cost | 0 | 268 | 0 | 536
Interest cost | 72 | 169 | 144 | 339
Amortization of prior service cost (credit) | (1,840) | (44) | (3,681) | (88)
Recognized actuarial loss (gain) | (1,090) | (921) | (2,180) | (1,843)
Net Periodic Cost (Benefit) | $ (2,858) | $ (528) | $ (5,717) | $ (1,056)

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- Definition The net periodic benefit or expense for defined benefit pension plans excluding the early retirement program and special separation benefit expense, curtailment, settlement and other programs separately disclosed in the financial statements. + References No definition available. + Details
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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/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e1928-114920 Reference 2: 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=118257860&loc=d3e4179-114921 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)(4) -URI http://asc.fasb.org/extlink&oid=118255775&loc=d3e2709-114920 + 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/exampleRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 55 -Paragraph 17 -URI http://asc.fasb.org/extlink&oid=118257860&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=118255775&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=118255775&loc=d3e2709-114920 + Details
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