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Earnings Per Share - Diluted (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Diluted earnings per share    
Net income available for common stockholders, net of dividends and undistributed earnings allocated to participating securities $ 171,538 $ 4,227
Weighted average shares of common stock outstanding    
Issued and outstanding (in shares) 90,699,321 40,398,381
Weighted average shares of common stock outstanding (in shares) 92,406,318 40,398,381
Diluted Earnings per share (in dollars per share) $ 1.86 $ 0.10
Anti-dilutive shares excluded from computation of EPS   774,529
Class A    
Weighted average shares of common stock outstanding    
Issued and outstanding (in shares) 90,699,321 40,398,381
Issuable pursuant to 2015 Management Incentive Plan (in shares) 1,706,996 0
Weighted average shares of common stock outstanding (in shares) 92,406,317 40,398,381