Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	$ (42,931)	$ (14,860)	$ (8,112)	$ (24,794)
Foreign currency translation adjustments, tax	(7,934)	1,293	(7,692)	(1,624)
Total foreign currency translation adjustment	(50,865)	(13,567)	(15,804)	(26,418)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	856	1,407	2,574	7,765
Pension and other postretirement benefit plans, tax	(190)	(301)	(572)	(1,657)
Total pension and other postretirement benefit plans	666	1,106	2,002	6,108
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	1,419	(1,374)	(368)	2,116
Changes in fair value of cash flow hedges, tax	(297)	289	76	(444)
Total cash flow hedges	1,122	(1,085)	(292)	1,672
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	(40,656)	(14,827)	(5,906)	(14,913)
Other comprehensive earnings (loss), tax	(8,421)	1,281	(8,188)	(3,725)
Other comprehensive (loss) earnings	(49,077)	(13,546)	(14,094)	(18,638)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	206,006	157,305	509,796	428,698
Other comprehensive earnings (loss)	(49,077)	(13,546)	(14,094)	(18,638)
Comprehensive earnings	156,929	143,759	495,702	410,060
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	176	517	526	4,354
Amortization of prior service costs	680	890	2,048	3,411
Total before tax	856	1,407	2,574	7,765
Tax (benefit) provision	(190)	(301)	(572)	(1,657)
Net of tax	666	1,106	2,002	6,108
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings	730	460	(85)	(439)
Tax expense (benefit)	(153)	(96)	16	92
Net of tax	$ 577	$ 364	$ (69)	$ (347)