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Employee Benefit Plans (Schedule of Changes in Projected Benefit Obligations) (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Defined Benefit Plan, Benefit Obligation, Beginning Balance | $ 172,143 |  |
Defined Benefit Plan, Benefit Obligation, Ending Balance | 178,604 | $ 172,143 |
Pension Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Defined Benefit Plan, Benefit Obligation, Beginning Balance | 172,143 | 161,955 |
Defined Benefit Plan, Service Cost | 12,502 | 10,686 | $ 10,319
Defined Benefit Plan, Interest Cost | 5,405 | 5,326 | 4,790
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 159 | 0
Defined Benefit Plan, Actuarial Net (Gains) Losses | (1,045) | 11,336 |
Defined Benefit Plan Settlement Gain Loss | 0 | (438) |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0 | 12,907 |
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | (7,801) | (5,974) |
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation | (2,600) | 2,000 |
Defined Benefit Plan, Benefit Obligation, Ending Balance | 178,604 | 172,143 | 161,955
Other Postretirement Benefit Plans, Defined Benefit [Member] |  |  |
Defined Benefit Plan, Change in Benefit Obligation [Roll Forward] |  |  |
Defined Benefit Plan, Benefit Obligation, Beginning Balance | 70,198 | 60,524 |
Defined Benefit Plan, Service Cost | 3,028 | 2,543 | 2,883
Defined Benefit Plan, Interest Cost | 2,319 | 2,118 | 2,259
Defined Benefit Plan, Contributions by Plan Participants (Deprecated 2017-01-31) | 432 | 354 |
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment | 0 | 0 | (13,743)
Defined Benefit Plan, Actuarial Net (Gains) Losses | (7,172) | 5,510 |
Defined Benefit Plan Settlement Gain Loss | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, (Increase) Decrease for Settlement | 0 | 0 |
Defined Benefit Plan, Benefits Paid (Deprecated 2017-01-31) | (1,409) | (851) |
Defined Benefit Plan, Foreign Currency Exchange Rate Changes, Benefit Obligation | 0 | 0 |
Defined Benefit Plan, Benefit Obligation, Ending Balance | $ 67,396 | $ 70,198 | $ 60,524

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- Definition Amount of gain (loss) related to change in benefit obligation resulting from changes in settlements. + References No definition available. + Details
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- Definition Amount of gain (loss) from change in actuarial assumptions which (increases) decreases benefit obligation of defined benefit plan. Assumptions include, but are not limited to, interest, mortality, employee turnover, salary, and temporary deviation from substantive plan. + 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 (a)(4) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + 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 (a) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of payment to participant of defined benefit plan which decreases benefit obligation. For pension plan, payment includes, but is not limited to, pension benefits and death benefits. For other postretirement plan, payment includes, but is not limited to, prescription drug benefits, health care benefits, life insurance benefits, and legal, educational and advisory services. + 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 (a)(6) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 60 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6414203&loc=d3e39716-114964 + Details
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- Definition Amount of contributions received by defined benefit plan from participant which increase benefit obligation. + 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 (a)(3) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period. + References No definition available. + Details
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- Definition Amount of foreign currency translation gain (loss) which (increases) decreases benefit obligation of defined benefit plan. + 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 (a)(5) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to 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)(2) -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 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 6 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 + Details
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- Definition Amount of increase (decrease) in benefit obligation of defined benefit plan from change in terms of existing plan or initiation of new plan. + 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 (a)(7) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee 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 1 -Subparagraph (h)(1) -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)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e2709-114920 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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