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Retirement Plans, Components of Net Periodic Benefit Cost, Pension Benefits (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |  |
Recognition of actuarial loss | [1] | $ (7,322) | $ (25,776) | $ 15,013
Recognition of prior service credit (cost) | [1] | (2,317) | (3,760) | (4,763)
Pension Plan [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost |  | 7,622 | 10,677 | 13,402
Interest cost |  | 15,499 | 13,729 | 14,123
Expected return on plan assets |  | (22,406) | (18,195) | (16,805)
Actuarial loss (gain) |  | 2,890 | 4,400 | 5,484
Prior service credit |  | 0 | 0 | 0
Net periodic benefit cost |  | 3,605 | 10,611 | 16,204
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |  |
Current year actuarial loss (gain) |  | (7,396) | 7,562 | 15,203
Recognition of actuarial loss |  | (2,890) | (37,833) | (5,484)
Recognition of prior service credit (cost) |  | 0 | 0 | 0
Total recognized in other comprehensive income |  | (10,286) | (30,271) | 9,719
Total recognized in net periodic benefit cost and other comprehensive income |  | (6,681) | (19,660) | 25,923
SERP [Member] |  |  |  |
Components of net periodic benefit cost [Abstract] |  |  |  |
Service cost |  | 0 | 0 | 0
Interest cost |  | 49 | 58 | 65
Expected return on plan assets |  | 0 | 0 | 0
Actuarial loss (gain) |  | 23 | 28 | 26
Prior service credit |  | 0 | 0 | 0
Net periodic benefit cost |  | 72 | 86 | 91
Other changes in plan assets and benefit obligations recognized in other comprehensive income [Abstract] |  |  |  |
Current year actuarial loss (gain) |  | (70) | 42 | 12
Recognition of actuarial loss |  | (23) | (28) | (26)
Recognition of prior service credit (cost) |  | 0 | 0 | 0
Total recognized in other comprehensive income |  | (93) | 14 | (14)
Total recognized in net periodic benefit cost and other comprehensive income |  | $ (21) | $ 100 | $ 77
[1] | Actuarial gains (losses) are amortized into other income (expense). (See Note 11 - Retirement Plans)

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- Definition Amount recognized in net periodic benefit cost (credit) and other comprehensive (income) loss. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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 + 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=108410482&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=112275985&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=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -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)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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