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
Earnings Per Share [Abstract]
Net income	$ 7,337	$ 8,873	$ 7,956	$ 22,646
Basic-weighted average shares outstanding (in shares)	27,818	27,701	27,785	27,636
Effect of dilutive potential securities (in shares)	133	197	161	217
Diluted- weighted average shares outstanding (in shares)	27,951	27,898	27,946	27,853
Basic (in dollars per share)	$ 0.26	$ 0.32	$ 0.29	$ 0.82
Diluted (in dollars per share)	$ 0.26	$ 0.32	$ 0.28	$ 0.81
Antidilutive securities excluded from computation of earnings per share (in shares)	1,600		1,400