Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	$ 6,611	$ (72,203)
Foreign currency translation adjustments, tax	2,158	(11,906)
Total foreign currency translation	8,769	(84,109)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	3,691	5,788
Pension and other postretirement benefit plans, tax	(1,241)	(1,962)
Total pension and other postretirement benefit plans	2,450	3,826
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	(147)	1,629
Changes in fair value of cash flow hedges, tax	51	(570)
Total cash flow hedges	(96)	1,059
Other comprehensive earnings other adjustment, net of tax [Abstract]
Other, before tax	2,090	241
Other, tax	(251)	(27)
Other comprehensive earnings other adjustment	1,839	214
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	12,245	(64,545)
Other comprehensive earnings (loss), tax	717	(14,465)
Other comprehensive earnings (loss)	12,962	(79,010)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	99,356	209,510
Other comprehensive earnings (loss)	12,962	(79,010)
Comprehensive earnings	112,318	130,500
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Pension And Other Postretirement Benefit Plans Net Of Tax Abstract [Abstract]
Amortization of actuarial losses	2,076	3,902
Amortization of prior service costs	1,615	1,886
Total before tax	3,691	5,788
Tax provision	(1,241)	(1,962)
Net of tax	2,450	3,826
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Cash flow hedges	(72)	(153)
Tax benefit	25	54
Net of tax	$ (47)	$ (99)