Consolidated Statements of Changes in Stockholders' Equity (Unaudited) - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Retained Deficit	Accumulated Other Comprehensive Income (Loss)
Balance (in shares) at Dec. 31, 2018		39,506,000
Balance at Dec. 31, 2018	$ 223,590	$ 40	$ 453,193	$ (218,646)	$ (10,997)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	32,637	0	0	32,637	0
Foreign currency translation	214	0	0	0	214
Interest rate swaps, net of the change in taxes	(269)	$ 0	0	0	(269)
Repurchases of common stock, net of retirements (shares)		(155,000)
Repurchases of common stock, net of retirements	(23,097)	$ (1)	0	(23,096)	0
Share-based compensation	3,259	$ 0	3,259	0	0
Issuance of shares under share-based compensation plans (shares)		328,000
Issuance of stock under share-based compensation plans	7,071	$ 1	7,070	0	0
Declaration of cash dividends	(17,819)	0	0	(17,819)	0
Balance at Mar. 31, 2019	$ 224,877	$ 40	463,522	(227,633)	(11,052)
Balance (in shares) at Mar. 31, 2019	39,679,157	39,679,000
Balance (in shares) at Dec. 31, 2019	40,074,160	40,074,000
Balance at Dec. 31, 2019	$ 410,180	$ 40	485,239	(64,740)	(10,359)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net Income	30,912	0	0	30,912	0
Foreign currency translation	(5,430)	0	0	0	(5,430)
Interest rate swaps, net of the change in taxes	(8,510)	$ 0	0	0	(8,510)
Repurchases of common stock, net of retirements (shares)		(362,000)
Repurchases of common stock, net of retirements	(66,619)	$ 0	0	(66,619)	0
Share-based compensation	3,654	$ 0	3,654	0	0
Issuance of shares under share-based compensation plans (shares)		219,000
Issuance of stock under share-based compensation plans	6,358	$ 0	6,358	0	0
Declaration of cash dividends	(22,147)	0	0	(22,147)	0
Balance at Mar. 31, 2020	$ 348,398	$ 40	$ 495,251	$ (122,594)	$ (24,299)
Balance (in shares) at Mar. 31, 2020	39,930,962	39,931,000