Other Comprehensive Earnings (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Foreign currency translation adjustments [Abstract]
Foreign currency translation, pre-tax	$ 38,521	$ (74,476)	$ (33,636)
Foreign currency translation, tax	359	13,954	0
Total foreign currency translation, net of tax	38,880	(60,522)	(33,636)
Pension and other postretirement benefit plans [Abstract]
Pension and other postretirement benefit plans, pre-tax	(70,642)	(54,519)	(2,468)
Pension and other postretirement benefit plans, tax	23,632	18,204	1,189
Pension and other postretirement benefit plans, net of tax	(47,010)	(36,315)	(1,279)
Changes in fair value of cash flow hedges [Abstract]
Changes in fair value of cash flow hedges, pre-tax	195	(1,649)	360
Changes in fair value of cash flow hedges, tax	(70)	577	(126)
Changes in fair value of cash flow hedges, net of tax	125	(1,072)	234
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract]
Other comprehensive income other adjustment, pre-tax	692	270
Other comprehensive income other adjustment, tax	(83)	(32)
Other comprehensive income other adjustment, net of tax	609	238	0
Total other comprehensive earnings [Abstract]
Total other comprehensive earnings, pre-tax	(31,234)	(130,374)	(35,744)
Total other comprehensive earnings, tax	23,838	32,703	1,063
Other comprehensive earnings, net of tax	(7,396)	(97,671)	(34,681)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Cumulative foreign currency translation adjustments	165,872	126,992
Pension and other postretirement benefit plans	(223,887)	(176,877)
Changes in fair value of cash flow hedges	3,109	2,375
Accumulated other comprehensive (loss) earnings, net of tax	$ (54,906)	$ (47,510)