Unaudited Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Common stock	Additional paid-in capital	Accumulated deficit	Accumulated other comprehensive loss	Treasury stock
Balance as of Beginning of period at Dec. 31, 2018	$ 24,945
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Reclassification of mandatorily redeemable noncontrolling interests	(22,428)
Net income (loss)	0
Balance as of End of period at Mar. 31, 2019	2,517
Balance (in shares) at Dec. 31, 2018		48,044				0
Balance at Dec. 31, 2018	607,595	$ 5	$ 1,569,725	$ (961,689)	$ (446)	$ 0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for stock options, restricted stock units and employee stock purchase plan (in shares)		211
Common stock issued for stock options and restricted stock units	283		283
Stock-based compensation	2,443		2,443
Tax payments from shares withheld for equity awards	(2,425)		(2,425)
Cumulative translation adjustment	107				107
Net (loss) income	62,170			62,170
Balance (in shares) at Mar. 31, 2019		48,255				0
Balance at Mar. 31, 2019	668,537	$ 5	1,570,026	(901,155)	(339)	$ 0
Balance as of Beginning of period at Dec. 31, 2019	0
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net income (loss)	0
Balance as of End of period at Mar. 31, 2020	$ 0
Balance (in shares) at Dec. 31, 2019	47,753	49,059				(1,306)
Balance at Dec. 31, 2019	$ 643,515	$ 5	1,586,972	(914,791)	(272)	$ (28,399)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Common stock issued for stock options, restricted stock units and employee stock purchase plan (in shares)		89
Common stock issued for stock options and restricted stock units	0	$ 0	0
Stock-based compensation	(1,201)		(1,201)
Tax payments from shares withheld for equity awards	(917)		(917)
Cumulative translation adjustment	272				272
Net (loss) income	$ (315,494)			(315,494)
Balance (in shares) at Mar. 31, 2020	47,842	49,148				(1,306)
Balance at Mar. 31, 2020	$ 326,175	$ 5	$ 1,584,854	$ (1,230,285)	$ 0	$ (28,399)