Consolidated Statements of Stockholders' Equity - 3 months ended Mar. 31, 2017 - USD ($) shares in Thousands, $ in Thousands	Total	Common Stock [Member]	Paid-in Capital [Member]	Retained Earnings [Member]
Balance at Dec. 31, 2016	$ 205,898	$ 211	$ 0	$ 205,687
Balance (in shares) at Dec. 31, 2016		52,651
Net income	10,217
Stock options exercised and restricted stock awards vested	898		898
Stock options exercised and restricted stock awards vested (in shares)		170
Share-based compensation	1,645		1,645
Stock repurchased and retired	(6,863)	$ (1)	(2,543)	(4,319)
Stock repurchased and retired (in shares)		(198)
Balance at Mar. 31, 2017	$ 211,795	$ 210	$ 0	$ 211,585
Balance (in shares) at Mar. 31, 2017		52,623