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Employee Benefit Plans (Narrative) (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |
Defined Benefit Plan, Plan with Accumulated Benefit Obligation in Excess of Plan Assets, Accumulated Benefit Obligation | $ 174,400 | $ 169,705 |
Defined Contribution Plan, Cost | 15,300 | 14,200 | $ 9,900
Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 14,444 | 19,308 | 15,614
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | 16,300 |  |
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | 6,609 | $ 5,338 | $ 6,347
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 1,500 |  |
Debt Securities [Member] |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities | 40.00% |  |
Equity Securities [Member] |  |  |
Defined Benefit Plan Change In Benefit Obligation [Line Items] |  |  |
Defined Benefit Plan, Target Allocation Percentage of Assets, Equity Securities | 60.00% |  |

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- Definition Amount of contributions expected to be received by defined benefit plan from employer in next fiscal year following latest fiscal year. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (g) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for 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 6 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 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 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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