Income Per Share - (Schedule of Computation of Basic and Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 7,231	$ 8,314	$ 24,698	$ 13,069
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic	(14)	(12)	(43)	(37)
Income available to common stockholders (numerator)	$ 7,217	$ 8,302	$ 24,655	$ 13,032
Weighted average common shares outstanding (denominator)	26,947,821	27,654,827	26,902,128	28,991,094
Weighted average shares outstanding for diluted earnings per common share	27,628,734	27,898,756	27,636,675	29,111,322
Income per share-basic (in dollars per share)	$ 0.27	$ 0.30	$ 0.92	$ 0.45
Income per share-diluted (in dollars per share)	$ 0.26	$ 0.30	$ 0.89	$ 0.45
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities	680,913	173,747	723,304	92,885
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities		70,182	11,243	27,343