CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Unaudited) - USD ($) $ in Thousands	Total	Common Stock Issued [Member]	Treasury Stock [Member]	Additional Paid-In Capital [Member]	Additional Paid-In Capital [Member] Cumulative Effect Period Of Adoption Adjustment [Member] Revision Of Prior Period Accounting Standards Update Adjustment [Member]	Retained Earnings (Accumulated Deficit) [Member]	Retained Earnings (Accumulated Deficit) [Member] Cumulative Effect Period Of Adoption Adjustment [Member] Revision Of Prior Period Accounting Standards Update Adjustment [Member]	Accumulated Other Comprehensive Loss [Member]
Beginning Balance, Shares at Dec. 31, 2020		274,558,000	(134,616,000)
Beginning Balance at Dec. 31, 2020	$ 1,666,243	$ 2,745	$ (870,558)	$ 1,902,776		$ 633,118		$ (1,838)
Stock-based compensation	8,701
Common stock issued under stock compensation plans, net of shares withheld for employee taxes, Shares		683,000
Common stock issued under stock compensation plans, net of shares withheld for employee taxes		$ 6		(5,980)
Treasury Stock Shares Acquired			0
Purchase of treasury stock, Shares			0
Purchase of treasury stock			$ 0
Warrants issued				1,037
Net income (loss)						9,057
Foreign currency translation adjustments, net	99							99
Unrecognized gain (loss) on derivatives qualifying as cash flow hedges, net of tax								(505)
Ending Balance, Shares at Mar. 31, 2021		275,241,000	(134,616,000)
Ending Balance at Mar. 31, 2021	1,678,658	$ 2,751	$ (870,558)	1,906,534		642,175		(2,244)
Ending Balance (ASU 2020-06 [Member]) at Mar. 31, 2021					$ 0		$ 0
Beginning Balance, Shares at Dec. 31, 2020		274,558,000	(134,616,000)
Beginning Balance at Dec. 31, 2020	$ 1,666,243	$ 2,745	$ (870,558)	1,902,776		633,118		(1,838)
Common stock issued under stock compensation plans, net of shares withheld for employee taxes, Shares	2,200,000
Ending Balance, Shares at Dec. 31, 2021	276,705,000	276,705,000	(160,591,000)
Ending Balance at Dec. 31, 2021	$ 1,408,138	$ 2,766	$ (1,321,805)	1,962,386		767,556		(2,765)
Stock-based compensation	$ 10,822
Common stock issued under stock compensation plans, net of shares withheld for employee taxes, Shares	1,000,000.0	991,000
Common stock issued under stock compensation plans, net of shares withheld for employee taxes		$ 10		(13,301)
Treasury Stock Shares Acquired			(2,313,000)
Purchase of treasury stock, Shares			2,313,000
Purchase of treasury stock			$ (49,679)
Warrants issued				1,037
Net income (loss)						22,857
Accounting Standards Update [Extensible List]	Stock-based compensation
Foreign currency translation adjustments, net	$ (150)							(150)
Unrecognized gain (loss) on derivatives qualifying as cash flow hedges, net of tax								(187)
Ending Balance, Shares at Mar. 31, 2022	277,696,000	277,696,000	(162,904,000)
Ending Balance at Mar. 31, 2022	$ 1,353,106	$ 2,776	$ (1,371,484)	$ 1,922,026		$ 802,890		$ (3,102)
Ending Balance (ASU 2020-06 [Member]) at Mar. 31, 2022					$ (38,918)		$ 12,477