CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Retained Earnings	Accumulated Other Comprehensive Losses	Treasury Stock
Balance at beginning of period (in shares) at Dec. 31, 2019		53,473,620
Balance at beginning of period at Dec. 31, 2019	$ 520,988	$ 750	$ 638,917	$ 221,841	$ (3,978)	$ (336,542)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	(106,647)			(106,647)
Foreign currency translation	(1,636)				(1,636)
Stock-based compensation (in shares)		141,223
Stock-based compensation	(917)	$ 3	(920)
Stock repurchase (in shares)		(766,122)
Stock repurchase	(10,051)					(10,051)
Common stock dividends	(3,885)			(3,885)
Unrealized gain (loss) on derivative instruments	(3,883)				(3,883)
Balance at end of period (in shares) at Mar. 31, 2020		52,848,721
Balance at end of period at Mar. 31, 2020	393,969	$ 753	637,997	111,309	(9,497)	(346,593)
Balance at beginning of period (in shares) at Dec. 31, 2020		52,536,482
Balance at beginning of period at Dec. 31, 2020	404,879	$ 755	644,695	107,233	7,633	(355,437)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income (loss)	3,217			3,217
Foreign currency translation	(303)				(303)
Stock-based compensation (in shares)		101,083
Stock-based compensation	2,032	$ 1	2,031
Stock repurchase (in shares)		(1,038,674)
Stock repurchase	(19,321)					(19,321)
Common stock dividends	(3,967)			(3,967)
Unrealized gain (loss) on derivative instruments	14,530				14,530
Stock option exercises (in shares)		112,400
Stock option exercises	1,235	$ 1	1,234
Balance at end of period (in shares) at Mar. 31, 2021		51,711,291
Balance at end of period at Mar. 31, 2021	$ 402,302	$ 757	$ 647,960	$ 106,483	$ 21,860	$ (374,758)