Earnings per Share (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 3,996	$ 9,029
Weighted average shares outstanding	31,688,000	31,423,000
Common stock options and restricted stock (in shares)	566,000	367,000
Diluted	32,254,000	31,790,000
Common shares
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Antidilutive securities excluded from earnings per share calculation (in shares)	526,000	723,000