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Retirement Plans (Components of Net Periodic Benefit Cost and Other Amounts Recognized in Other Comprehensive Income) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Deferred Compensation Plan Contributions By Employer | $ 400 | $ 200 | $ 300
Net actuarial loss (gain) | 11,273 | 4,684 | 12,079
Reversal of amortization of net actuarial loss | (2,127) | (2,102) | (6,462)
Retirement Income Plan [Member] |  |  |
Service cost | 0 | 0 | 1,647
Interest cost | 12,428 | 12,490 | 12,336
Expected return on plan assets | (22,767) | (19,419) | (17,309)
Amortization of unrecognized actuarial loss | 1,981 | 2,001 | 6,299
Total net periodic cost | (8,358) | (4,928) | 2,973
Net actuarial loss (gain) | 12,600 | 3,594 | 11,316
Reversal of amortization of net actuarial loss | (1,981) | (2,001) | (6,299)
Total recognized in other comprehensive income | 10,619 | 1,593 | 5,017
Total recognized in net periodic benefit cost and OCI | 2,261 | (3,335) | 7,990
Estimated net actuarial loss that will be amortized from AOCI into net periodic benefit cost | 2,600 |  |
Retirement Life Plan [Member] |  |  |
Total net periodic cost | 300 | 300 | 300
Supplemental Employee Retirement Plan [Member] |  |  |
Total net periodic cost | $ 400 | $ 400 | $ 500

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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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