Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Numerator:
Net income	$ 6,146	$ 6,175	$ 13,633	$ 21,421
Less: Net income allocated to participating securities	0	(25)	0	(103)
Net income available to common shareholders	$ 6,146	$ 6,150	$ 13,633	$ 21,318
Denominator:
Weighted average common shares outstanding	15,805	20,788	17,489	20,662
Weighted average dilutive securities	372	426	328	451
Weighted average common shares outstanding, diluted	16,177	21,214	17,817	21,113
Income per common share, basic (in dollars per share)	$ 0.39	$ 0.3	$ 0.78	$ 1.03
Income per common share, diluted (in dollars per share)	$ 0.38	$ 0.29	$ 0.77	$ 1.01