Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Capital in Excess of Par Value	Accumulated Other Comprehensive Loss	Accumulated Deficit
Beginning Balance (in shares) at Dec. 31, 2018		173,530
Beginning Balance at Dec. 31, 2018	$ 1,717,575	$ 17	$ 3,147,925	$ (6,316)	$ (1,424,051)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under equity compensation plans (in shares)		2,975
Shares issued under equity compensation plans	23,377	$ 0	23,377
Stock-based compensation	99,795		99,795
Comprehensive loss	(435,356)			5,311	(440,667)
Ending Balance (in shares) at Dec. 31, 2019		176,505
Ending Balance at Dec. 31, 2019	1,405,391	$ 17	3,271,097	(1,005)	(1,864,718)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under equity compensation plans (in shares)		3,586
Shares issued under equity compensation plans	23,373	$ 1	23,372
Stock-based compensation	94,261		94,261
Comprehensive loss	(445,730)			(1,290)	(444,440)
Ending Balance (in shares) at Dec. 31, 2020		180,091
Ending Balance at Dec. 31, 2020	1,077,295	$ 18	3,388,730	(2,295)	(2,309,158)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Shares issued under equity compensation plans (in shares)		5,377
Shares issued under equity compensation plans	33,238	$ 1	33,237
Stock-based compensation	94,674		94,674
Comprehensive loss	(525,699)			(1,862)	(523,837)
Ending Balance (in shares) at Dec. 31, 2021		185,468
Ending Balance at Dec. 31, 2021	$ 679,508	$ 19	$ 3,516,641	$ (4,157)	$ (2,832,995)