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Summary of Significant Accounting Policies - Basic and Diluted Net Income Per Share Calculations (Details) - USD ($)
$ / shares in Units, $ in Thousands
 3 Months Ended 9 Months Ended
Sep. 30, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Basic net income per share calculation:        
Numerator - Net income $ 110,521 $ 93,747 $ 304,802 $ 264,122
Denominator - Weighted average common shares outstanding (in shares) 76,301,010 77,145,023 76,480,757 77,116,377
Basic net income per common share (in dollars per share) $ 1.45 $ 1.22 $ 3.99 $ 3.42
Diluted net income per share calculation:        
Numerator – Net income $ 110,521 $ 93,747 $ 304,802 $ 264,122
Denominator - Weighted average common shares outstanding (in shares) 76,301,000 77,145,000 76,481,000 77,116,000
Dilutive shares contingently issuable (in shares) 255,000 346,000 280,000 326,000
Weighted average diluted common shares outstanding (in shares) 76,556,309 77,490,977 76,761,167 77,442,554
Diluted net income per common share (in dollars per share) $ 1.44 $ 1.21 $ 3.97 $ 3.41