Condensed Consolidated Statements of Stockholders' Equity (Deficit) - USD ($) $ in Thousands	Common Stock	Paid-in Capital	Retained Earnings	Treasury Stock, at cost	Accumulated Other Comprehensive Income (Loss)	Total
Beginning Balance at Dec. 31, 2019	$ 252	$ 730,551	$ 731,425	$ (827,381)	$ 5,689	$ 640,536
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Dividends on common shares			(7,834)			(7,834)
Total comprehensive income (loss)			(25,299)		(17,403)	(42,702)
Employee stock-based compensation		3,962				3,962
Purchase of common stock under share repurchase program		(198)				(198)
Ending Balance at Mar. 31, 2020	252	734,315	698,292	(827,381)	(11,714)	593,764
Beginning Balance at Dec. 31, 2020	253	767,484	378,906	(827,381)	(35,701)	283,561
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Total comprehensive income (loss)			(6,042)		1,337	(4,705)
Employee stock-based compensation		3,885	18			3,903
Issuance of shares of common stock under long-term incentive plan	1					1
Common stock withheld related to net share settlement of equity awards		(1,317)				(1,317)
Ending Balance at Mar. 31, 2021	$ 254	$ 770,052	$ 372,882	$ (827,381)	$ (34,364)	$ 281,443