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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
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Mar. 31, 2020 | Mar. 31, 2019
Basic net income per share calculation: |  |
Numerator - Net income | $ 28,356 | $ 93,960
Denominator - Weighted average common shares outstanding (in shares) | 75,803,402 | 76,803,171
Basic net income per common share (in dollars per share) | $ 0.37 | $ 1.22
Diluted net income per share calculation: |  |
Numerator – Net income | $ 28,356 | $ 93,960
Denominator - Weighted average common shares outstanding (in shares) | 75,803,000 | 76,803,000
Dilutive shares contingently issuable (in shares) | 163,000 | 325,000
Weighted average diluted common shares outstanding (in shares) | 75,966,295 | 77,127,692
Diluted net income per common share (in dollars per share) | $ 0.37 | $ 1.22

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