Consolidated Statements of Shareholders' Equity - 6 months ended Jun. 30, 2017 - USD ($) $ in Thousands	Common Stock	Treasury Stock	Additional Paid-In Capital	Other Comprehensive Income (Loss)	Retained Earnings	Total
Beginning Balance, shares at Dec. 31, 2016	1,824	1,596
Beginning Balance, amount at Dec. 31, 2016	$ 342	$ (114,274)	$ 37,448	$ (474)	$ 239,946	$ 162,988
Net Income					19,976	19,976
Other comprehensive income (loss)				66		66
Stock-based compensation transactions, shares	46	(46)
Stock-based compensation transactions, amount		$ 583	10,569			11,152
Shares surrendered in stock transactions	$ (34)	34
Shares surrendered in stock transactions, amount		$ (17,972)				(17,972)
Dividends					(3,887)	(3,887)
Ending Balance, Shares at Jun. 30, 2017	1,836	1,584
Ending Balance, Amount at Jun. 30, 2017	$ 342	$ (131,663)	$ 48,017	$ (408)	$ 256,035	$ 172,323