UNAUDITED CONDENSED CONSOLIDATED STATEMENT OF CHANGES IN STOCKHOLDERS’ EQUITY - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock	Additional Paid-In Capital	Accumulated Other Comprehensive Loss	Retained Earnings	Treasury Stock
Shares at beginning of period (in shares) at Dec. 31, 2018		71,856				45,822
Balance at beginning of period at Dec. 31, 2018	$ 168,331	$ 719	$ 447,337	$ 1,296	$ 237,308	$ (518,329)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	26,855				26,855
Reclassification of stranded tax effects	0			168	(168)
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		4
Issuance for stock-based compensation and dividends, net of forfeitures	0	$ 0	233		(233)
Stock-based compensation expense	2,620		2,620
Employee stock purchase plan (in shares)						(5)
Employee stock purchase plan	140		86			$ 54
Dividends	(4,406)				(4,406)
Change in fair value of interest rate swaps, net of tax	(280)			(280)
Repurchases of common stock (in shares)						432
Repurchases of common stock	(14,688)					$ (14,688)
Shares at end of period (in shares) at Mar. 31, 2019		71,860				46,249
Balance at end of period at Mar. 31, 2019	178,572	$ 719	450,276	1,184	259,356	$ (532,963)
Shares at beginning of period (in shares) at Dec. 31, 2019		72,202				49,277
Balance at beginning of period at Dec. 31, 2019	167,263	$ 722	459,545	(1,526)	350,545	$ (642,023)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	9,106				9,106
Issuance for stock-based compensation and dividends, net of forfeitures (in shares)		4
Issuance for stock-based compensation and dividends, net of forfeitures	0		218		(218)
Stock-based compensation expense	2,896		2,896
Employee stock purchase plan (in shares)						(4)
Employee stock purchase plan	142		93			$ 49
Dividends	(4,293)				(4,293)
Change in fair value of interest rate swaps, net of tax	(1,121)			(1,121)
Repurchases of common stock (in shares)						685
Repurchases of common stock	(20,380)					$ (20,380)
Shares at end of period (in shares) at Mar. 31, 2020		72,198				49,958
Balance at end of period at Mar. 31, 2020	$ 153,399	$ 722	$ 462,752	$ (2,647)	$ 354,926	$ (662,354)