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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
	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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The amount of net income (loss) for the period per each share of common stock or unit outstanding during the reporting period.

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