Other Comprehensive Earnings (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended								12 Months Ended
	Dec. 31, 2013	Sep. 30, 2013	Jun. 30, 2013	Mar. 31, 2013	Dec. 31, 2012	Sep. 30, 2012	Jun. 30, 2012	Mar. 31, 2012	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Foreign currency translation adjustments [Abstract]
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, before Tax									$ 2,602	$ 38,521	$ (74,476)
Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Tax									2,134	359	13,954
Total foreign currency translation, net of tax									4,736	38,880	(60,522)
Pension and other postretirement benefit plans [Abstract]
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Adjustment, before Tax									182,092	(70,642)	(54,519)
Other Comprehensive (Income) Loss, Pension and Other Postretirement Benefit Plans, Tax									(63,585)	23,632	18,204
Pension and other postretirement benefit plans, net of tax									118,507	(47,010)	(36,315)
Changes in fair value of cash flow hedges [Abstract]
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, before Tax									(75)	195	(1,649)
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Tax									26	(70)	577
Changes in fair value of cash flow hedges, net of tax									(49)	125	(1,072)
Other Comprehensive Income Other Adjustment Net Of Tax [Abstract]
Other Comprehensive Income Loss Adjustment Before Tax									(642)	692	270
Other Comprehensive Income Loss Other Adjustment Tax									77	(83)	(32)
Other comprehensive income loss other adjustment, net of tax									(565)	609	238
Other Comprehensive Income (Loss), Net of Tax, Portion Attributable to Parent [Abstract]
Other Comprehensive Income (Loss), before Tax									183,977	(31,234)	(130,374)
Other Comprehensive Income (Loss), Tax									(61,348)	23,838	32,703
Other Comprehensive Income (Loss), Net of Tax									122,629	(7,396)	(97,671)
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract]
Accumulated Other Comprehensive Income (Loss), Foreign Currency Translation Adjustment, Net of Tax	170,608				165,872				170,608	165,872
Accumulated Other Comprehensive Income (Loss), Pension and Other Postretirement Benefit Plans, Net of Tax	(105,380)				(223,887)				(105,380)	(223,887)
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax	2,495				3,109				2,495	3,109
Accumulated Other Comprehensive Income (Loss), Net of Tax	67,723				(54,906)				67,723	(54,906)
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net earnings	193,963	269,114	330,049	210,003	159,860	241,046	214,101	196,063	1,003,129	811,070	895,243
Comprehensive earnings									1,125,758	803,674	797,572
Other Comprehensive (Income) Loss, Reclassification Adjustment from AOCI, Pension and Other Postretirement Benefit Plans, Net of Tax [Abstract]
Amortization of actual losses									19,250	12,673	8,304
Amortization of prior service costs									8,834	8,174	8,283
Total amortization before tax									28,084	20,847	16,587
Tax provision on amortization									(9,809)	(7,013)	(5,551)
Total amortization, net of tax									18,275	13,834	11,036
Other Comprehensive Income Loss Reclassification Adjustment From AOCI Derivatives Net of Tax [Abstract]
Net (gains) losses reclassified into earnings									(130)	(549)	(191)
Tax benefit on gains reclassified into earnings									46	192	67
Net (gains) losses reclassified into earnings, net of tax									$ (84)	$ (357)	$ (124)