Consolidated Statements of Stockholders' Equity - USD ($) shares in Thousands, $ in Thousands	Total	Preferred Stock	Common Stock	Additional Paid-In Capital	Accumulated Deficit	Accumulated Other Comprehensive Loss
Balance at Dec. 31, 2019	$ 1,141,068	$ 0	$ 668	$ 1,515,109	$ (367,067)	$ (7,642)
Balance, Shares at Dec. 31, 2019		0	66,764
Net income (loss)	(787,434)				(787,434)
Other comprehensive income (loss), net of tax	(6,811)					(6,811)
Shares issued in connection with stock-based compensation plans, net	(904)		$ 2	(906)
Shares issued in connection with stock-based compensation plans, net, Shares			197
Stock-based compensation	1,971			1,971
Balance at Mar. 31, 2020	347,890	$ 0	$ 670	1,516,174	(1,154,501)	(14,453)
Balance, Shares at Mar. 31, 2020		0	66,961
Balance at Dec. 31, 2019	1,141,068	$ 0	$ 668	1,515,109	(367,067)	(7,642)
Balance, Shares at Dec. 31, 2019		0	66,764
Net income (loss)	(824,339)
Balance at Sep. 30, 2020	322,373	$ 0	$ 672	1,525,114	(1,191,406)	(12,007)
Balance, Shares at Sep. 30, 2020		0	67,206
Balance at Mar. 31, 2020	347,890	$ 0	$ 670	1,516,174	(1,154,501)	(14,453)
Balance, Shares at Mar. 31, 2020		0	66,961
Net income (loss)	(24,644)				(24,644)
Other comprehensive income (loss), net of tax	645					645
Shares issued in connection with stock-based compensation plans, net	595		$ 2	593
Shares issued in connection with stock-based compensation plans, net, Shares			239
Stock-based compensation	4,295			4,295
Balance at Jun. 30, 2020	328,781	$ 0	$ 672	1,521,062	(1,179,145)	(13,808)
Balance, Shares at Jun. 30, 2020		0	67,200
Net income (loss)	(12,261)				(12,261)
Other comprehensive income (loss), net of tax	1,801					1,801
Shares issued in connection with stock-based compensation plans, net	(20)		$ 0	(20)
Shares issued in connection with stock-based compensation plans, net, Shares			6
Stock-based compensation	4,072			4,072
Balance at Sep. 30, 2020	322,373	$ 0	$ 672	1,525,114	(1,191,406)	(12,007)
Balance, Shares at Sep. 30, 2020		0	67,206
Balance at Dec. 31, 2020	340,176	$ 0	$ 674	1,530,493	(1,184,187)	(6,804)
Balance, Shares at Dec. 31, 2020		0	67,387
Net income (loss)	5,278				5,278
Other comprehensive income (loss), net of tax	1,200					1,200
Shares issued in connection with stock-based compensation plans, net	(5,630)		$ 11	(5,641)
Shares issued in connection with stock-based compensation plans, net, Shares			1,144
Stock-based compensation	4,978			4,978
Balance at Mar. 31, 2021	346,002	$ 0	$ 685	1,529,830	(1,178,909)	(5,604)
Balance, Shares at Mar. 31, 2021		0	68,531
Balance at Dec. 31, 2020	340,176	$ 0	$ 674	1,530,493	(1,184,187)	(6,804)
Balance, Shares at Dec. 31, 2020		0	67,387
Net income (loss)	13,675
Balance at Sep. 30, 2021	366,560	$ 0	$ 690	1,539,583	(1,170,512)	(3,201)
Balance, Shares at Sep. 30, 2021		0	69,025
Balance at Mar. 31, 2021	346,002	$ 0	$ 685	1,529,830	(1,178,909)	(5,604)
Balance, Shares at Mar. 31, 2021		0	68,531
Net income (loss)	5,966				5,966
Other comprehensive income (loss), net of tax	1,201					1,201
Shares issued in connection with stock-based compensation plans, net	(1,419)		$ 5	(1,424)
Shares issued in connection with stock-based compensation plans, net, Shares			433
Stock-based compensation	5,692			5,692
Balance at Jun. 30, 2021	357,442	$ 0	$ 690	1,534,098	(1,172,943)	(4,403)
Balance, Shares at Jun. 30, 2021		0	68,964
Net income (loss)	2,431				2,431
Other comprehensive income (loss), net of tax	1,202					1,202
Shares issued in connection with stock-based compensation plans, net	(1)		$ 0	(1)
Shares issued in connection with stock-based compensation plans, net, Shares			61
Stock-based compensation	5,486			5,486
Balance at Sep. 30, 2021	$ 366,560	$ 0	$ 690	$ 1,539,583	$ (1,170,512)	$ (3,201)
Balance, Shares at Sep. 30, 2021		0	69,025