Other Comprehensive Earnings (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Foreign currency translation adjustments [Abstract]
Foreign currency translation adjustments, before tax	$ 13,812	$ (40,417)	$ 46,902	$ (33,806)
Foreign currency translation adjustments, tax	12,362	(1,575)	23,044	583
Total foreign currency translation adjustment	26,174	(41,992)	69,946	(33,223)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, before tax	3,021	3,701	6,022	7,392
Pension and other postretirement benefit plans, tax	(966)	(1,245)	(1,927)	(2,486)
Total pension and other postretirement benefit plans	2,055	2,456	4,095	4,906
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, before tax	(2,642)	78	(2,855)	(69)
Changes in fair value of cash flow hedges, tax	925	(27)	999	24
Total cash flow hedges	(1,717)	51	(1,856)	(45)
Other comprehensive earnings other adjustment, net of tax [Abstract]
Other, before tax	(657)	(507)	(274)	1,584
Other, tax	79	59	33	(192)
Other	(578)	(448)	(241)	1,392
Total other comprehensive earnings [Abstract]
Other comprehensive earnings (loss), before Tax	13,534	(37,145)	49,795	(24,899)
Other comprehensive earnings (loss), tax	12,400	(2,788)	22,149	(2,071)
Other comprehensive earnings (loss)	25,934	(39,933)	71,944	(26,970)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	164,058	118,290	336,305	217,646
Other comprehensive earnings (loss)	25,934	(39,933)	71,944	(26,970)
Comprehensive earnings	189,992	78,357	408,249	190,676
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	1,921	2,087	3,820	4,163
Amortization of prior service costs	1,100	1,614	2,202	3,229
Total before tax	3,021	3,701	6,022	7,392
Tax provision	(966)	(1,245)	(1,927)	(2,486)
Net of tax	2,055	2,456	4,095	4,906
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Cash flow hedges	245	328	(89)	256
Tax (expense) benefit	(86)	(115)	31	(90)
Net of tax	$ 159	$ 213	$ (58)	$ 166