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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($)
 3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Basic net income per share calculation:    
Numerator - Net income $ 83,510,000 $ 39,653,000
Denominator - Weighted average common shares outstanding (in shares) 77,077,957 48,022,342
Basic net income per common share (in dollars per share) $ 1.08 $ 0.83
Diluted net income per share calculation:    
Numerator – Net income $ 83,510,000 $ 39,653,000
Denominator - Weighted average common shares outstanding (in shares) 77,077,957 48,022,342
Dilutive shares contingently issuable (in shares) 287,707 495,578
Weighted average diluted common shares outstanding (in shares) 77,365,664 48,517,920
Diluted net income per common share (in dollars per share) $ 1.08 $ 0.82