Consolidated Statements of Stockholders' Equity - USD ($) $ in Thousands	Total	Capital Stock, Common	Additional Paid-in Capital	Retained Earnings	Treasury Stock
Balance at Dec. 31, 2017	$ 574,645	$ 907	$ 3,518	$ 694,174	$ (123,954)
Net income	13,378	0	0	13,378	0
Dividends on common stock, $0.02 per share	(1,667)	0	0	(1,667)	0
Repurchases of common stock	(1,293)	0	0	0	(1,293)
Stock-based compensation, net of tax	26	0	(104)	0	130
Balance at Mar. 31, 2018	585,089	907	3,414	705,885	(125,117)
Balance at Dec. 31, 2018	615,972	907	3,454	760,262	(148,651)
Net income	17,318	0	0	17,318	0
Dividends on common stock, $0.02 per share	(1,640)	0	0	(1,640)	0
Stock-based compensation, net of tax	177	0	(30)	0	207
Balance at Mar. 31, 2019	$ 631,827	$ 907	$ 3,424	$ 775,940	$ (148,444)