Consolidated Statement of Changes in Equity (unaudited) (USD $) In Thousands, except Share data, unless otherwise specified	Total	Common Stock [Member]	Additional Paid-In Capital [Member]	Retained Earnings [Member]	Shares Held in Trust [Member]	Other Comprehensive Income (Loss) [Member]	Noncontrolling Interest [Member]
Balances at Dec. 31, 2013	$ 2,190,809	$ 444	$ 945,512	$ 1,266,967	$ (8,052)	$ (25,202)	$ 11,140
Balances (in shares) at Dec. 31, 2013		44,447,958
Increase (decrease) in shareholders' equity [Roll Forward]
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	192,780			192,128			652
Shares issued under stock compensation programs (in shares)		498,158
Shares issued under stock compensation programs	2,224	5	2,219
Shares repurchased for payment of taxes on stock awards (in shares)		(128,358)
Shares repurchased for payment of taxes on stock awards	(15,639)	(1)	(15,638)
Tax adjustments due to vestings and exercises	9,361		9,361
Amortization of stock compensation	15,920		15,920
Dividends, Common Stock, Cash	(10,493)			(10,493)
Shares held in trust	1,645				1,645
Foreign currency translation adjustments	(51,637)					(51,637)
Increase in amount attributable to noncontrolling interest	8,249						8,249
Net Income (Loss) Attributable to Redeemable Noncontrolling Interest	464
Balances at Sep. 30, 2014	$ 2,343,219	$ 448	$ 957,374	$ 1,448,602	$ (6,407)	$ (76,839)	$ 20,041
Balances (in shares) at Sep. 30, 2014		44,817,758