Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	$ (14,967)	$ (52,979)	$ 34,819	$ (9,934)
Foreign currency translation adjustments, tax	989	(12,180)	242	(2,917)
Total foreign currency translation adjustment	(13,978)	(65,159)	35,061	(12,851)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	766	2,948	1,718	6,358
Pension and other postretirement benefit plans, tax	(177)	(628)	(382)	(1,356)
Total pension and other postretirement benefit plans	589	2,320	1,336	5,002
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	(4,780)	2,085	(1,787)	3,490
Changes in fair value of cash flow hedges, tax	1,002	(437)	373	(733)
Total cash flow hedges	(3,778)	1,648	(1,414)	2,757
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	(18,981)	(47,946)	34,750	(86)
Other comprehensive earnings (loss), tax	1,814	(13,245)	233	(5,006)
Other comprehensive (loss) earnings	(17,167)	(61,191)	34,983	(5,092)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	198,085	139,959	303,790	271,393
Other comprehensive earnings (loss)	(17,167)	(61,191)	34,983	(5,092)
Comprehensive earnings	180,918	78,768	338,773	266,301
Other Comprehensive Income Loss Reclassification Adjustment from AOCI Foreign Currency Translation Net of Tax [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Reclassification Adjustment from AOCI, Realized upon Sale or Liquidation, before Tax	0	0	25,339	0
Tax benefit	0	0	0	0
Net of tax	0	0	25,339	0
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Net Of Tax Abstract [Abstract]
Amortization of actuarial losses	122	1,365	350	3,837
Amortization of prior service costs	644	1,583	1,368	2,521
Total before tax	766	2,948	1,718	6,358
Tax (benefit) provision	(177)	(628)	(382)	(1,356)
Net of tax	589	2,320	1,336	5,002
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings	(524)	(579)	(815)	(899)
Tax expense (benefit)	108	122	169	189
Net of tax	$ (416)	$ (457)	$ (646)	$ (710)