CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS' EQUITY (Unaudited) - 6 months ended Jun. 30, 2016 - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)	Treasury Stock
Beginning Balance at Dec. 31, 2015	$ 2,561,131	$ 1,904	$ 1,011,811	$ 2,458,554	$ (4,093)	$ (907,045)
Beginning Balance (in shares) at Dec. 31, 2015	190,374,801	190,375,000
Net loss	$ (156,369)			(156,369)
Foreign currency translation adjustment	7,147				7,147
Issuance of restricted stock (in shares)		749,000
Issuance of restricted stock		$ 7	(7)
Vesting of restricted stock units (in shares)		15,000
Forfeitures of restricted stock (in shares)		(27,000)
Stock-based compensation	14,192		14,192
Tax expense related to stock- based compensation	(2,995)		(2,995)
Payment of cash dividends	(17,665)			(17,665)
Purchase of treasury stock	(3,611)					(3,611)
Ending Balance at Jun. 30, 2016	$ 2,401,830	$ 1,911	$ 1,023,001	$ 2,284,520	$ 3,054	$ (910,656)
Ending Balance (in shares) at Jun. 30, 2016	191,112,033	191,112,000