Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Other Comprehensive Income (Loss), Net of Tax [Abstract]
TranslationAdjustmentForNetInvestmentHedgeIncreaseDecrease	$ 4,500	$ (9,691)	$ (1,665)	$ 24,326
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	(40,417)	33,058	(33,806)	(39,145)
Foreign currency translation adjustments, tax	(1,575)	3,392	583	(8,514)
Total foreign currency translation	(41,992)	36,450	(33,223)	(47,659)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	3,701	5,775	7,392	11,563
Pension and other postretirement benefit plans, tax	(1,245)	(1,958)	(2,486)	(3,920)
Total pension and other postretirement benefit plans	2,456	3,817	4,906	7,643
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	78	(364)	(69)	1,265
Changes in fair value of cash flow hedges, tax	(27)	127	24	(443)
Total cash flow hedges	51	(237)	(45)	822
Other comprehensive earnings other adjustment, net of tax [Abstract]
Other, before tax	(507)	317	1,584	558
Other, tax	59	(40)	(192)	(67)
Other comprehensive earnings other adjustment	(448)	277	1,392	491
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	(37,145)	38,786	(24,899)	(25,759)
Other comprehensive earnings (loss), tax	(2,788)	1,521	(2,071)	(12,944)
Other comprehensive earnings (loss)	(39,933)	40,307	(26,970)	(38,703)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	118,290	332,396	217,646	541,906
Other comprehensive earnings (loss)	(39,933)	40,307	(26,970)	(38,703)
Comprehensive earnings	78,357	372,703	190,676	503,203
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Net Of Tax Abstract [Abstract]
Amortization of actuarial losses	2,087	3,890	4,163	7,792
Amortization of prior service costs	1,614	1,885	3,229	3,771
Total before tax	3,701	5,775	7,392	11,563
Tax provision	(1,245)	(1,958)	(2,486)	(3,920)
Net of tax	2,456	3,817	4,906	7,643
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Cash flow hedges	328	877	256	724
Tax benefit	(115)	(307)	(90)	(253)
Net of tax	$ 213	$ 570	$ 166	$ 471