Earnings per Common Share (Details) - Schedule of earnings per common share - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Earnings Per Share [Abstract]
Net income available to common stockholders									$ 43,220	$ 31,060	$ 41,199
Earnings allocated to participating securities									(141)	(147)	(157)
Income attributable to common stock									$ 43,079	$ 30,913	$ 41,042
Weighted average common shares outstanding, including participating securities									31,943	30,453	29,989
Weighted average participating securities									(41)	(54)	(51)
Weighted average common shares outstanding									31,902	30,399	29,938
Incremental shares from assumed conversions of options, performance units and restricted shares									335	291	346
Weighted average common and equivalent shares outstanding									32,237	30,690	30,284
Earnings per common share:
Basic	$ 0.33	$ 0.41	$ 0.24	$ 0.37	$ (0.07)	$ 0.39	$ 0.36	$ 0.35	$ 1.35	$ 1.02	$ 1.37
Diluted	$ 0.33	$ 0.41	$ 0.24	$ 0.37	$ (0.07)	$ 0.39	$ 0.36	$ 0.34	$ 1.34	$ 1.01	$ 1.36