Stockholders' Equity - Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Equity [Abstract]
Net income	$ 4,763	$ 1,147	$ 5,523	$ 6,431
Weighted average number of common shares outstanding (in shares)	29,875	29,449	29,874	29,449
Dilutive effect of restricted stock grants after application of the treasury stock method (in shares)	612	652	505	334
Dilutive shares outstanding (in shares)	30,487	30,101	30,379	29,783
Basic and diluted earnings per share (in dollars per share)	$ 0.16	$ 0.04	$ 0.18	$ 0.22