Condensed Consolidated Statements of Changes in Stockholders' Equity - USD ($) $ in Thousands	Total	Common Stock	Additional paid-in capital	Warrants	Accumulated deficit	Accumulated other comprehensive income (loss)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Total stockholders' equity				$ 1,076
Beginning balance (in shares) at Dec. 31, 2019		42,313,000
Beginning balance at Dec. 31, 2019	$ 353,277	$ 423	$ 501,615	1,076	$ (105,283)	$ (44,554)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(269,939)				(269,939)
Dividends accrued for preferred stock	(5,994)		(5,994)
Share-based compensation expense (in shares)		442,000
Share-based compensation expense	2,707	$ 4	2,703
Restricted shares forgiven for taxes (in shares)		(8,000)
Restricted shares forgiven for taxes	(30)	$ 0	(30)
Change in fair value of interest rate swap, net of tax	(12,464)					(12,464)
Reclassification of interest rate swap settlement to net income (loss), net of tax	3,690					3,690
Foreign currency translation gain (loss)	(13,348)					(13,348)
Ending balance (in shares) at Jun. 30, 2020		42,747,000
Ending balance at Jun. 30, 2020	57,899	$ 427	498,294	1,076	(375,222)	(66,676)
Beginning balance (in shares) at Mar. 31, 2020		42,757,000
Beginning balance at Mar. 31, 2020	78,902	$ 428	499,925		(353,474)	(69,053)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(21,748)				(21,748)
Dividends accrued for preferred stock	(3,043)		(3,043)
Share-based compensation expense (in shares)		(10,000)
Share-based compensation expense	1,411	$ (1)	1,412
Change in fair value of interest rate swap, net of tax	(1,255)					(1,255)
Reclassification of interest rate swap settlement to net income (loss), net of tax	2,638					2,638
Foreign currency translation gain (loss)	994					994
Ending balance (in shares) at Jun. 30, 2020		42,747,000
Ending balance at Jun. 30, 2020	57,899	$ 427	498,294	1,076	(375,222)	(66,676)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Total stockholders' equity				$ 1,076
Total stockholders' equity	254,152
Beginning balance (in shares) at Dec. 31, 2020		42,686,000
Beginning balance at Dec. 31, 2020	254,152	$ 427	493,332		(205,875)	(33,732)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(10,304)				(10,304)
Dividends accrued for preferred stock	$ (16,740)		(16,740)
Shares issues for option exercises (in shares)	6,000	6,000
Stock Issued During Period, Value, Stock Options Exercised	$ 48	$ 0	48
Share-based compensation expense (in shares)		394,000
Share-based compensation expense	1,986	$ 4	1,982
Restricted shares forgiven for taxes (in shares)		(52,000)
Restricted shares forgiven for taxes	(363)	$ (1)	(362)
Change in estimate of share-based award vesting	(337)		(337)
Change in fair value of interest rate swap, net of tax	0
Reclassification of interest rate swap settlement to net income (loss), net of tax	2,851					2,851
Foreign currency translation gain (loss)	1,062					1,062
Ending balance (in shares) at Jun. 30, 2021		43,034,000
Ending balance at Jun. 30, 2021	232,355	$ 430	477,923		(216,179)	(29,819)
Beginning balance (in shares) at Mar. 31, 2021		43,049,000
Beginning balance at Mar. 31, 2021	234,755	$ 430	479,341		(210,788)	(34,228)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Net loss	(5,391)				(5,391)
Dividends accrued for preferred stock	(2,211)		(2,211)
Shares issues for option exercises (in shares)		6,000
Stock Issued During Period, Value, Stock Options Exercised	48	$ 0	48
Share-based compensation expense (in shares)		(19,000)
Share-based compensation expense	1,100	$ 0	1,100
Restricted shares forgiven for taxes (in shares)		(2,000)
Restricted shares forgiven for taxes	(18)	$ 0	(18)
Change in estimate of share-based award vesting	(337)		(337)
Change in fair value of interest rate swap, net of tax	0
Reclassification of interest rate swap settlement to net income (loss), net of tax	0
Foreign currency translation gain (loss)	4,409					4,409
Ending balance (in shares) at Jun. 30, 2021		43,034,000
Ending balance at Jun. 30, 2021	232,355	$ 430	$ 477,923		$ (216,179)	$ (29,819)
Stockholders' Equity Attributable to Noncontrolling Interest [Roll Forward]
Total stockholders' equity	$ 232,355