CONDENSED CONSOLIDATED STATEMENT OF COMPREHENSIVE EARNINGS (unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net earnings	$ 99,356	$ 209,510
Foreign currency translation adjustments [Abstract]
Foreign currency translation gains (losses) during period	8,769	(83,829)
Reclassification of foreign currency translation losses to earnings upon sale of subsidiaries	0	(280)
Total foreign currency translation	8,769	(84,109)
Pension and other postretirement benefit plans [Abstract]
Amortization of actuarial losses included in net periodic pension cost	1,409	2,598
Amortization of prior service cost included in net periodic pension cost	1,041	1,228
Total pension and other postretirement benefit plans	2,450	3,826
Changes in fair value of cash flow hedges [Abstract]
Unrealized net (losses) gains arising during period	(49)	1,158
Net gains reclassified into earnings	(47)	(99)
Total cash flow hedges	(96)	1,059
Other comprehensive earnings other adjustment	1,839	214
Other comprehensive earnings (loss)	12,962	(79,010)
Comprehensive earnings	$ 112,318	$ 130,500