Consolidated Statements Of Changes In Stockholders' Equity - USD ($) $ in Thousands	Common Stock [Member]	Additional Paid-in Capital [Member]	Accumulated Other Comprehensive Income (Loss) [Member]	Retained Earnings [Member]	Total
Beginning balance, value at Dec. 31, 2012	$ 158	$ 2,850,855	$ (19,317)	$ 1,399,383	$ 4,231,079
Beginning balance, shares at Dec. 31, 2012	157,501,635
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)				(111,418)	(111,418)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Unrealized net gain (loss) on investment securities			(256)		(256)
Unrealized net gain (loss) on investment securities, net of tax			(256)		(256)
Foreign currency translation adjustment			2,073		2,073
Stock Withheld and Retired Value		(2,811)			(2,811)
Stock Withheld and Retired Shares	(119,070)
Stock Repurchased and Retired During Period, Shares	(426,883)
Stock Repurchased and Retired During Period, Value		(10,627)			(10,627)
Vesting of restricted stock assumed with acquisition	210,951
Exercise of stock options, value		6,263			6,263
Exercise of stock options, shares	(470,712)
Tax benefit (expense) from stock-based compensation		(1,185)			(1,185)
Cash dividends declared				(12,759)	(12,759)
Stock Issued During Period, Shares, Share-based Compensation	1,154,032
Stock-based compensation expense, net of forfeitures	$ 1	26,071			26,072
Shares issued under Employee Stock Purchase Plan, value		5,013			$ 5,013
Shares issued under Employee Stock Purchase Plan, shares	185,407				185,407
Exercise of stock options, shares	426,883
Ending balance, value at Dec. 31, 2013	$ 159	2,873,579	(17,500)	1,275,206	$ 4,131,444
Ending balance, shares at Dec. 31, 2013	158,976,784
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)				257,817	257,817
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Reclassification Adjustment of unrealized net loss on available-for-sale securities, Net of Tax			(1,153)		(1,153)
Foreign currency translation adjustment			(19,933)		(19,933)
Stock Withheld and Retired Value		(7,315)			(7,315)
Stock Withheld and Retired Shares	(267,340)
Stock Repurchased and Retired During Period, Shares	(10,246,091)
Stock Repurchased and Retired During Period, Value	$ (10)	(299,734)			(299,744)
Incremental common shares from restricted stock units	95,914
Vesting of restricted stock assumed with acquisition	114,839
Exercise of stock options, value	$ 1	10,560			10,561
Exercise of stock options, shares	(880,687)
Tax benefit (expense) from stock-based compensation		6,160			6,160
Cash dividends declared				(37,483)	(37,483)
Stock Issued During Period, Shares, Share-based Compensation	(152,447)
Stock-based compensation expense, net of forfeitures		30,982			30,982
Shares issued under Employee Stock Purchase Plan, value		6,096			$ 6,096
Shares issued under Employee Stock Purchase Plan, shares					246,480
Exercise of stock options, shares	10,246,091
Ending balance, value at Dec. 31, 2014	$ 150	2,620,328	(36,280)	1,495,540	$ 4,079,738
Ending balance, shares at Dec. 31, 2014	149,648,826
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income (loss)				(1,854,718)	(1,854,718)
Other Comprehensive Income (Loss), Net of Tax [Abstract]
Foreign currency translation adjustment			(9,414)		(9,414)
Stock Withheld and Retired Value		(5,696)			(5,696)
Stock Withheld and Retired Shares	(323,537)
Stock Repurchased and Retired During Period, Shares	(506,029)
Incremental common shares from restricted stock units	460,400
Restricted stock grant and expense, net of forefeitures, shares	(48,374)
Vesting of restricted stock assumed with acquisition	61,319
Exercise of stock options, value	$ 1	8,819			$ 8,820
Exercise of stock options, shares					506,029
Tax benefit (expense) from stock-based compensation		(2,174)			$ (2,174)
Cash dividends declared				(48,984)	(48,984)
Stock-based compensation expense, net of forfeitures		32,661			32,661
Shares issued to pay performance share unit, value		5,011			5,011
Shares issued to pay performance share unit, shares	224,303
Shares issued under Employee Stock Purchase Plan, value		5,568			$ 5,568
Shares issued under Employee Stock Purchase Plan, shares	332,534				332,467
Exercise of stock options, shares	506,029
Ending balance, value at Dec. 31, 2015	$ 151	$ 2,664,517	$ (45,694)	$ (408,162)	$ 2,210,812
Ending balance, shares at Dec. 31, 2015	150,861,500