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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 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Basic net income per common share calculation:        
Numerator - Net income $ 62,444 $ 100,321 $ 90,800 $ 194,281
Denominator - Weighted average common shares outstanding (in shares) 75,210,869 76,343,608 75,507,136 76,572,120
Basic net income per common share (in dollars per share) $ 0.83 $ 1.31 $ 1.20 $ 2.54
Diluted net income per common share calculation:        
Numerator – Net income $ 62,444 $ 100,321 $ 90,800 $ 194,281
Denominator - Weighted average common shares outstanding (in shares) 75,211,000 76,344,000 75,507,000 76,572,000
Dilutive shares contingently issuable (in shares) 112,000 268,000 139,000 294,000
Weighted average diluted common shares outstanding (in shares) 75,323,259 76,611,657 75,645,768 76,866,163
Diluted net income per common share (in dollars per share) $ 0.83 $ 1.31 $ 1.20 $ 2.53