Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	$ 72,823	$ 9,370	$ 119,725	$ (24,436)
Foreign currency translation adjustments, tax	20,446	2,119	43,490	2,702
Total foreign currency translation adjustment	93,269	11,489	163,215	(21,734)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	3,049	3,698	9,071	11,087
Pension and other postretirement benefit plans, tax	(974)	(1,242)	(2,901)	(3,725)
Total pension and other postretirement benefit plans	2,075	2,456	6,170	7,362
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	(712)	(488)	(3,566)	(557)
Changes in fair value of cash flow hedges, tax	249	170	1,248	195
Total cash flow hedges	(463)	(318)	(2,318)	(362)
Other comprehensive earnings other adjustment, net of tax [Abstract]
Other, before tax	309	269	35	1,853
Other, tax	(37)	(29)	(4)	(221)
Other	272	240	31	1,632
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	75,469	12,849	125,265	(12,053)
Other comprehensive earnings (loss), tax	19,684	1,018	41,833	(1,049)
Other comprehensive earnings (loss)	95,153	13,867	167,098	(13,102)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	178,912	130,084	515,217	347,730
Other comprehensive earnings (loss)	95,153	13,867	167,098	(13,102)
Comprehensive earnings	274,065	143,951	682,315	334,628
Other Comprehensive Income Loss Reclassification Adjustment from AOCI Foreign Currency Translation Net of Tax [Abstract]
Reclassification of foreign currency translation losses to earnings upon sale of subsidiary	0	0	3,875	0
Tax benefit	0	0	0	0
Net of tax	0	0	3,875	0
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Net Of Tax Abstract [Abstract]
Amortization of actuarial losses	1,951	2,082	5,771	6,243
Amortization of prior service costs	1,098	1,616	3,300	4,844
Total before tax	3,049	3,698	9,071	11,087
Tax provision	(974)	(1,242)	(2,901)	(3,725)
Net of tax	2,075	2,456	6,170	7,362
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings	(417)	(55)	(506)	201
Tax expense (benefit)	146	19	177	(70)
Net of tax	$ (271)	$ (36)	$ (329)	$ 131