Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning Balance, shares at Dec. 31, 2013		300,805,000
Beginning Balance at Dec. 31, 2013	$ 2,350,745	$ 3,008	$ 1,006,084	$ 1,321,642	$ 20,011
Net income	381,519	0	0	381,519	0
Total other comprehensive loss	(60,236)	$ 0	0	0	(60,236)
Restricted stock units vested, shares		975,000
Restricted stock units vested, value	0	$ 10	(10)	0	0
Stock-based compensation expense	22,021	$ 0	22,021	0	0
Stock options exercised, shares		1,688,000
Exercise of stock options, value	9,324	$ 17	9,307	0	0
Tax withholdings related to net share settlements of stock-based compensation awards, shares		(15,000)
Tax withholdings related to net share settlements of stock-based compensation awards, value	(443)	$ 0	(443)
Excess tax benefit from stock-based payments	17,727	$ 0	17,727	0	0
Ending Balance, shares at Dec. 31, 2014		303,453,000
Ending Balance at Dec. 31, 2014	2,720,657	$ 3,035	1,054,686	1,703,161	(40,225)
Net income	423,223	0	0	423,223	0
Total other comprehensive loss	(65,245)	$ 0	0	0	(65,245)
Restricted stock units vested, shares		840,000
Restricted stock units vested, net of shares withheld for employee tax	(4,341)	$ 8	(4,349)	0	0
Stock-based compensation expense	21,336	$ 0	21,336	0	0
Stock options exercised, shares		1,425,000
Exercise of stock options, value	8,863	$ 14	8,849	0	0
Tax withholdings related to net share settlements of stock-based compensation awards, shares		(144,000)
Tax withholdings related to net share settlements of stock-based compensation awards, value	(3,936)	$ (2)	(3,934)
Excess tax benefit from stock-based payments	14,125	$ 0	14,125	0	0
Ending Balance, shares at Dec. 31, 2015		305,574,000
Ending Balance at Dec. 31, 2015	3,114,682	$ 3,055	1,090,713	2,126,384	(105,470)
Net income	463,975	0	0	463,975	0
Total other comprehensive loss	(161,705)	$ 0	0	0	(161,705)
Restricted stock units vested, shares		847,000
Restricted stock units vested, net of shares withheld for employee tax	(4,438)	$ 9	(4,447)	0	0
Stock-based compensation expense	$ 22,472	$ 0	22,472	0	0
Stock options exercised, shares	1,124,317	1,124,000
Exercise of stock options, value	$ 7,963	$ 11	7,952	0	0
Ending Balance, shares at Dec. 31, 2016		307,545,000
Ending Balance at Dec. 31, 2016	$ 3,442,949	$ 3,075	$ 1,116,690	$ 2,590,359	$ (267,175)