Unaudited Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock Class A Common Stock	Common Stock Class B Convertible Common Stock	Common Stock Class C Common Stock	Additional Paid-in-Capital	Retained Earnings	Accumulated Other Comprehensive Income (Loss)
Beginning balance (shares) at Dec. 31, 2018		187,710	34,450	226,422
Beginning balance at Dec. 31, 2018	$ 2,016,871	$ 62	$ 11	$ 75	$ 916,628	$ 1,139,082	$ (38,987)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)		355		271
Exercise of stock options	1,638				1,638
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares)		(15)		(217)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	(4,088)					(4,088)
Issuance of common stock, net of forfeitures (shares)		151		2,405
Issuance of common stock, net of forfeitures	4,138			$ 1	4,137
Stock-based compensation expense	38,048				38,048
Comprehensive income (loss)	97,059					107,443	(10,384)
Ending balance (shares) at Sep. 30, 2019		188,201	34,450	228,881
Ending balance at Sep. 30, 2019	2,153,666	$ 62	$ 11	$ 76	960,451	1,242,437	(49,371)
Beginning balance (shares) at Jun. 30, 2019		188,144	34,450	228,653
Beginning balance at Jun. 30, 2019	2,048,274	$ 62	$ 11	$ 76	946,488	1,141,129	(39,492)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)		40		34
Exercise of stock options	265				265
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares)				(59)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	(1,007)					(1,007)
Issuance of common stock, net of forfeitures (shares)		17		253
Issuance of common stock, net of forfeitures	1,285				1,285
Stock-based compensation expense	12,413				12,413
Comprehensive income (loss)	92,436					102,315	(9,879)
Ending balance (shares) at Sep. 30, 2019		188,201	34,450	228,881
Ending balance at Sep. 30, 2019	2,153,666	$ 62	$ 11	$ 76	960,451	1,242,437	(49,371)
Beginning balance (shares) at Dec. 31, 2019		188,290	34,450	229,028
Beginning balance at Dec. 31, 2019	2,150,087	$ 62	$ 11	$ 76	973,717	1,226,986	(50,765)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)		147		135
Exercise of stock options	517				517
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares)		(1)		(233)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	(3,285)					(3,285)
Issuance of common stock, net of forfeitures (shares)		98		2,755
Issuance of common stock, net of forfeitures	3,638			$ 1	3,637
Stock-based compensation expense	32,770				32,770
Equity Component value of convertible note issuance, net	40,342				40,342
Comprehensive income (loss)	(753,723)					(733,630)	(20,093)
Ending balance (shares) at Sep. 30, 2020		188,534	34,450	231,685
Ending balance at Sep. 30, 2020	1,470,346	$ 62	$ 11	$ 77	1,050,983	490,071	(70,858)
Beginning balance (shares) at Jun. 30, 2020		188,461	34,450	231,354
Beginning balance at Jun. 30, 2020	1,423,414	$ 62	$ 11	$ 77	1,044,055	450,750	(71,541)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Exercise of stock options (shares)		2		2
Exercise of stock options	18				18
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements (shares)				(57)
Shares withheld in consideration of employee tax obligations relative to stock-based compensation arrangements	375					375
Issuance of common stock, net of forfeitures (shares)		71		386
Issuance of common stock, net of forfeitures	978				978
Stock-based compensation expense	9,513				9,513
Equity Component value of convertible note issuance, net	(3,581)				(3,581)
Comprehensive income (loss)	39,629					38,946	683
Ending balance (shares) at Sep. 30, 2020		188,534	34,450	231,685
Ending balance at Sep. 30, 2020	$ 1,470,346	$ 62	$ 11	$ 77	$ 1,050,983	$ 490,071	$ (70,858)