Earnings Per Share - Diluted (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
Diluted earnings per share
Net income available for common stockholders, net of dividends and undistributed earnings allocated to participating securities	$ (13,832)	$ 6,835	$ (9,034)	$ 25,140
Weighted average shares of common stock outstanding
Issued and outstanding	79,199,142	38,351,465	53,520,346	38,264,139
Weighted average number of shares of common stock outstanding	79,199,142	38,351,465	53,520,346	38,264,139
Diluted Earnings per share	$ (0.17)	$ 0.18	$ (0.17)	$ 0.66
Anti-dilutive shares excluded from computation of EPS	1,578,617	1,151,260	1,704,307	383,294
Class A
Weighted average shares of common stock outstanding
Issued and outstanding	79,199,142	38,351,465	53,520,346	38,264,139