Income Per Share - (Schedule of Computation of Basic and Diluted Income Per Share) (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended												12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2014	Mar. 31, 2014	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Net income	$ 9,991	$ 8,314	$ 4,504	$ 251	$ 3,340	$ 1,636	$ (1,341)	$ 1,246	$ 2,279	$ 3,337	$ 2,129	$ 1,431	$ 23,060	$ 4,881	$ 9,176
Undistributed Earnings (Loss) Allocated to Participating Securities, Basic													(52)	(53)	(38)
Income available to common stockholders (numerator)													$ 23,008	$ 4,828	$ 9,138
Weighted average common shares outstanding (denominator)													28,313,061	34,349,996	42,404,609
Weighted average shares outstanding for diluted earnings per common share													29,091,343	34,363,487	42,421,014
Income per share-basic (in dollars per share)	$ 0.38	$ 0.30	$ 0.15	$ 0.01	$ 0.11	$ 0.05	$ (0.04)	$ 0.03	$ 0.06	$ 0.08	$ 0.05	$ 0.03	$ 0.81	$ 0.14	$ 0.22
Income per share-diluted (in dollars per share)	$ 0.36	$ 0.30	$ 0.15	$ 0.01	$ 0.11	$ 0.05	$ (0.04)	$ 0.03	$ 0.06	$ 0.08	$ 0.05	$ 0.03	$ 0.79	$ 0.14	$ 0.22
Equity Option [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities													704,831	9,321	16,405
Warrant [Member]
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]
Dilutive Convertible Securities													73,451	4,170