Stockholders' Equity - Diluted Earnings per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Equity [Abstract]
Net income	$ 131	$ 2,720	$ 760	$ 5,283
Weighted average number of common shares outstanding (in shares)	29,874	29,449	29,873	29,449
Dilutive effect of restricted stock grants after application of the treasury stock method (in shares)	581	307	452	183
Dilutive shares outstanding (in shares)	30,455	29,756	30,325	29,632
Basic and diluted earnings per share attributable to common stockholders (in dollars per share)	$ 0.00	$ 0.09	$ 0.03	$ 0.18