Condensed Consolidated Statement of Stockholders' Equity (USD $) In Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Non-Controlling Interest
Beginning Balance at Dec. 31, 2013	$ 1,101,942	$ 77	$ 910,145	$ 657,877	$ 16,486	$ (599,816)	$ 117,173
Beginning Balance (in shares) at Dec. 31, 2013		77,048
Shares issued on exercise of stock options and warrants (in shares)		302
Shares issued on exercise of stock options and warrants	3,792		3,792
Shares issued on vesting of restricted stock (in shares)		752
Shares issued on vesting of restricted stock	1	1
Tax benefit of stock option exercises	1,480		1,480
Compensation expense in connection with restricted stock and stock options	14,726		14,726
Shares repurchased on the open market	(171,627)					(171,627)
Cost of shares repurchased on vesting of restricted stock and exercise of stock options	(13,971)					(13,971)
Change in redemption value of redeemable non-controlling interest	(537)		(537)
Net income	138,836			128,866			9,970
Foreign currency translation	(29,144)				(29,144)
Distributions to non-controlling interest holders	(10,110)						(10,110)
Unrealized gain on investments	50				50
Ending Balance at Sep. 30, 2014	$ 1,035,438	$ 78	$ 929,606	$ 786,743	$ (12,608)	$ (785,414)	$ 117,033
Ending Balance (in shares) at Sep. 30, 2014		78,102