CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($)	Total	Additional Paid-in Capital	Retained Earnings (Accumulated Deficit)	Treasury Stock	Accumulated Other Comprehensive Income (Loss)	Common Class A	Common Stock	Warrant
Balance at Dec. 31, 2013	$ 1,964,716,000	$ 2,087,287,000	$ (121,482,000)	$ 0	$ (1,188,000)	$ 2,000	$ 97,000
Balance (shares) at Dec. 31, 2013				0		2,020,000	97,667,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock in connection with exercise of stock options	125,897,000	125,893,000					$ 4,000
Issuance of Common Stock in connection with exercise of stock options (shares)							3,468,000
Common Stock tendered upon exercise of stock options in connection with employee tax obligations	(267,584,000)	(267,583,000)					$ (1,000)
Common Stock tendered upon exercise of stock options in connection with employee tax obligations (in shares)							(754,000)
Issuance of Common Stock in connection with conversion of convertible senior notes	691,356,000	691,354,000					$ 2,000
Issuance of Common Stock in connection with conversion of convertible senior notes (in shares)							2,018,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution	13,125,000	13,125,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution (shares)							21,000
Issuance of restricted Common Stock under Long-Term Incentive Plan	0
Issuance of restricted Common Stock under Long-Term Incentive Plan (shares)							8,000
Conversion of Class A Stock to Common Stock (shares)						(47,000)	47,000
Stock-based compensation charges	326,815,000	326,815,000
Excess tax benefit from stock-based compensation	439,278,000	439,278,000
Acquisition of Common Stock in connection with exercise of convertible note hedges	0	169,530,000		$ (169,530,000)
Acquisition of Common Stock in connection with exercise of convertible note hedges (in shares)				(2,018,000)
Reduction of warrants	(294,552,000)	(294,552,000)
Reclassification of warrant liability	(148,496,000)	(148,496,000)
Reduction of equity component of convertible senior notes	(691,869,000)	(691,869,000)
Net income	338,126,000		338,126,000
Other comprehensive income (loss), net of tax	53,439,000				53,439,000
Balance at Dec. 31, 2014	2,550,251,000	2,450,782,000	216,644,000	$ (169,530,000)	52,251,000	$ 2,000	$ 102,000
Balance (shares) at Dec. 31, 2014				(2,018,000)		1,973,000	102,475,000
Other Liabilities, Fair Value Disclosure								$ 87,500,000
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock in connection with exercise of stock options	215,462,000	215,460,000					$ 2,000
Issuance of Common Stock in connection with exercise of stock options (shares)							2,457,000
Common Stock tendered upon exercise of stock options in connection with employee tax obligations	(160,538,000)	(160,538,000)					$ 0
Common Stock tendered upon exercise of stock options in connection with employee tax obligations (in shares)							(298,000)
Issuance of Common Stock in connection with conversion of convertible senior notes	818,360,000	818,358,000					$ 2,000
Issuance of Common Stock in connection with conversion of convertible senior notes (in shares)							1,625,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution	15,382,000	15,382,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution (shares)							31,000
Issuance of restricted Common Stock under Long-Term Incentive Plan	0
Issuance of restricted Common Stock under Long-Term Incentive Plan (shares)							28,000
Conversion of Class A Stock to Common Stock (shares)						(60,000)	60,000
Stock-based compensation charges	464,022,000	464,022,000
Excess tax benefit from stock-based compensation	405,317,000	405,317,000
Acquisition of Common Stock in connection with exercise of convertible note hedges	0	136,539,000		$ (136,539,000)
Acquisition of Common Stock in connection with exercise of convertible note hedges (in shares)				(1,625,088)
Reduction of warrants	(449,456,000)	(449,456,000)
Reclassification of warrant liability	23,317,000	23,317,000
Reduction of equity component of convertible senior notes	(819,657,000)	(819,657,000)
Net income	636,056,000		636,056,000
Other comprehensive income (loss), net of tax	(43,679,000)				(43,679,000)
Balance at Dec. 31, 2015	3,654,837,000	3,099,526,000	852,700,000	$ (306,069,000)	8,572,000	$ 2,000	$ 106,000
Balance (shares) at Dec. 31, 2015				(3,643,000)		1,913,000	106,378,000
Other Liabilities, Fair Value Disclosure								0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Issuance of Common Stock in connection with exercise of stock options	115,182,000	115,180,000					$ 2,000
Issuance of Common Stock in connection with exercise of stock options (shares)							1,697,000
Common Stock tendered upon exercise of stock options in connection with employee tax obligations	(143,182,000)	(143,182,000)					$ 0
Common Stock tendered upon exercise of stock options in connection with employee tax obligations (in shares)							(382,000)
Issuance of Common Stock in connection with conversion of convertible senior notes	48,004,000	48,004,000					$ 0
Issuance of Common Stock in connection with conversion of convertible senior notes (in shares)							121,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution	16,561,000	16,561,000
Issuance of Common Stock in connection with Company 401(k) Savings Plan contribution (shares)							27,000
Issuance of restricted Common Stock under Long-Term Incentive Plan	0
Issuance of restricted Common Stock under Long-Term Incentive Plan (shares)							17,000
Conversion of Class A Stock to Common Stock (shares)						(2,000)	2,000
Stock-based compensation charges	574,887,000	574,887,000
Acquisition of Common Stock in connection with exercise of convertible note hedges	0	10,171,000		$ (10,171,000)
Acquisition of Common Stock in connection with exercise of convertible note hedges (in shares)				(121,048)
Reduction of warrants	(643,365,000)	(643,365,000)
Reduction of equity component of convertible senior notes	(47,789,000)	(47,789,000)
Net income	895,522,000		895,522,000
Other comprehensive income (loss), net of tax	(21,412,000)				(21,412,000)
Balance at Dec. 31, 2016	$ 4,449,245,000	$ 3,029,993,000	$ 1,748,222,000	$ (316,240,000)	$ (12,840,000)	$ 2,000	$ 108,000
Balance (shares) at Dec. 31, 2016				(3,764,000)		1,911,000	107,860,000
Other Liabilities, Fair Value Disclosure								$ 0