Earnings Per Share - Diluted (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Diluted earnings per share
Net income available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ 6,835	$ 12,306	$ 25,140	$ 12,780
Weighted average shares of common stock outstanding
Issued and outstanding	38,351,465	34,305,052	38,264,139	34,305,052
Weighted average number of shares of common stock outstanding	38,351,465	34,738,733	38,264,139	34,641,497
Diluted Earnings per share	$ 0.18	$ 0.35	$ 0.66	$ 0.37
Anti-dilutive shares excluded from computation of EPS	1,151,260		383,294
Class A
Weighted average shares of common stock outstanding
Issued and outstanding	38,351,465	34,305,052	38,264,139	34,305,052
2015 Management Incentive Plan | Class A
Weighted average shares of common stock outstanding
Issuable pursuant to 2015 Management Incentive Plan		433,681		336,445