Condensed Consolidated Statement of Stockholder's Equity (Unaudited) - 9 months ended Sep. 30, 2016 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning balance, shares at Dec. 31, 2015	88,228	88,228
Beginning balance at Dec. 31, 2015	$ 1,049,490	$ 1	$ 551,206	$ 618,399	$ (120,116)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	102,967			102,967
Shares issued in connection with share-based compensation (shares)		1,033
Shares issued in connection with share-based compensation (value)	13,119		13,119
Tax withholdings related to net share settlements of restricted stock units	(9,544)		(9,544)
Share-based compensation	29,859		29,859
Shares repurchased and retired, shares		(2,899)
Shares repurchased and retired	(112,961)		(112,961)
Other comprehensive income	$ 7,689				7,689
Ending balance, shares at Sep. 30, 2016	86,362	86,362
Ending balance at Sep. 30, 2016	$ 1,080,619	$ 1	$ 471,679	$ 721,366	$ (112,427)