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Employee Benefit Plans (Components of Net Periodic Benefit Cost Recognized in Other Comprehensive Income) (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax $ 1,063 $ (10,587) $ 4,427
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 947 (11,717) (444)
Pension Plans, Defined Benefit [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
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, Expected Return (Loss) on Plan Assets (7,535) (6,215) (5,138)
Defined Benefit Plan, Amortization of Gain (Loss) 3,728 4,382 4,323
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) 344 344 294
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 (4,785) (1,026)
Defined Benefit Plan, Net Periodic Benefit Cost, Total 14,444 19,308 15,614
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax 12,954 2,633 8,785
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (3,728) (4,382) (4,323)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax (344) (344) (294)
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 0 (4,785) (1,026)
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 159 0
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments (565) 759 707
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax 8,317 (5,960) 3,849
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease 22,761 13,348 19,463
Other Postretirement Benefit Plans, Defined Benefit [Member]      
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) [Abstract]      
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, Expected Return (Loss) on Plan Assets 0 0 0
Defined Benefit Plan, Amortization of Gain (Loss) 2,577 1,992 1,827
Defined Benefit Plan, Amortization of Prior Service Cost (Credit) (1,315) (1,315) (622)
Defined Benefit Plan, Net Periodic Benefit Cost (Credit), Gain (Loss) Due to Settlement 0 0 0
Defined Benefit Plan, Net Periodic Benefit Cost, Total 6,609 5,338 6,347
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss) Arising During Period, before Tax (7,172) 5,507 6,228
Other Comprehensive Income (Loss), Defined Benefit Plan, Gain (Loss), Reclassification Adjustment from AOCI, before Tax (2,577) (1,992) (1,827)
Other Comprehensive (Income) Loss, Defined Benefit Plan, Prior Service Cost (Credit), Reclassification Adjustment from AOCI, before Tax 1,315 1,315 622
Other Comprehensive Income (Loss), Defined Benefit Plan, Settlement and Curtailment Gain (Loss), before Tax 0 0 0
Defined Benefit Plan, Benefit Obligation, Increase (Decrease) for Plan Amendment 0 0 (13,743)
Other Comprehensive Income Defined Benefit Plan Net Foreign Exchange Translations And Other Adjustments 0 0 0
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Reclassification Adjustment, before Tax (8,434) 4,830 (8,720)
Defined Benefit Plan Net Periodic Benefit Cost And Other Comprehensive Income Defined Benefit Plans Adjustment Before Tax Period Increase Decrease $ (1,825) $ 10,168 $ (2,373)