Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2015	Sep. 30, 2014	Sep. 30, 2015	Sep. 30, 2014
Earnings Per Share [Abstract]
Net income	$ 8,873	$ 1,972	$ 22,646	$ 20,853
Basic-weighted average shares outstanding	27,701	27,454	27,636	27,354
Effect of dilutive potential securities	197	234	217	423
Diluted- weighted average shares outstanding	27,898	27,688	27,853	27,777
Basic (in dollars per share)	$ 0.32	$ 0.07	$ 0.82	$ 0.76
Diluted (in dollars per share)	$ 0.32	$ 0.07	$ 0.81	$ 0.75