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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($)
 3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Basic net income per share calculation:        
Numerator - Net income $ 86,865,000 $ 43,086,000 $ 170,375,000 $ 82,739,000
Denominator - Weighted average common shares outstanding (in shares) 77,123,854 53,097,776 77,101,816 50,574,079
Basic net income per common share (in dollars per share) $ 1.13 $ 0.81 $ 2.21 $ 1.64
Diluted net income per share calculation:        
Numerator – Net income $ 86,865,000 $ 43,086,000 $ 170,375,000 $ 82,739,000
Denominator - Weighted average common shares outstanding (in shares) 77,123,854 53,097,776 77,101,816 50,574,079
Dilutive shares contingently issuable (in shares) 344,228 568,149 316,114 531,917
Weighted average diluted common shares outstanding (in shares) 77,468,082 53,665,925 77,417,930 51,105,996
Diluted net income per common share (in dollars per share) $ 1.12 $ 0.80 $ 2.20 $ 1.62