Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock, Shares [Member]	Common Stock, Amount	Additional Paid-in Capital	Accumulated Other Comprehensive Income (Loss)	Retained Earnings
Common Stock, Shares, Outstanding		131,342,000
Total stockholders’ equity	$ 1,287,947		$ 131	$ 1,154,058	$ (7,052)	$ 140,810
Stock-based compensation	48,367			48,367
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture	3,872		2	3,870
Stock options exercised and awards vested (in shares)		1,484,000
Adjustments To Additional Paid In Capital Stock Withheld To Cover Employee Taxes	(5,293)			(5,293)
Stock withheld to cover employee taxes (in shares)		130,000
Repurchases and retirements of common stock	(257,059)		(7)	(59,776)		(197,276)
Stock Repurchased and Retired During Period, Shares		(6,794,000)
Net income	8,722					8,722
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings				16,616
Foreign currency translation adjustments	(53)				(53)
Unrealized gain (loss) on cash flow hedges, net of tax	58,668				58,668
Common Stock, Shares, Outstanding		125,902,000
Total stockholders’ equity	1,128,555		126	1,124,610	51,563	(47,744)
Stock-based compensation	64,139			64,139
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture	3,958		2	3,956
Stock options exercised and awards vested (in shares)		1,788,000
Adjustments To Additional Paid In Capital Stock Withheld To Cover Employee Taxes	(9,680)			(9,680)
Stock withheld to cover employee taxes (in shares)		162,000
Repurchases and retirements of common stock	(247,019)		(5)	(43,946)		(203,068)
Stock Repurchased and Retired During Period, Shares		(4,752,000)
Net income	15,415					15,415
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings				49,613
Dividends	(49,613)
Foreign currency translation adjustments	(58)				(58)
Unrealized gain (loss) on cash flow hedges, net of tax	$ (17,598)				(17,598)
Common Stock, Shares, Outstanding	122,775,823	122,776,000
Total stockholders’ equity	$ 888,099		123	1,089,466	33,907	(235,397)
Stock-based compensation	68,327			68,327
Shares Issued, Value, Share-based Payment Arrangement, before Forfeiture	3,441		1	3,440
Stock options exercised and awards vested (in shares)		1,761,000
Adjustments To Additional Paid In Capital Stock Withheld To Cover Employee Taxes	(6,702)			(6,702)
Stock withheld to cover employee taxes (in shares)		194,000
Repurchases and retirements of common stock	(407,725)		(14)	(124,240)		(283,471)
Stock Repurchased and Retired During Period, Shares		(13,986,000)
Net income	112,776					112,776
Adjustments to Additional Paid in Capital, Dividends in Excess of Retained Earnings				65,943
Dividends	(65,943)
Foreign currency translation adjustments	(3,143)				(3,143)
Unrealized gain (loss) on cash flow hedges, net of tax	$ (12,493)				(12,493)
Common Stock, Shares, Outstanding	110,357,000	110,357,000
Total stockholders’ equity	$ 576,637		$ 110	$ 964,348	$ 18,271	$ (406,092)