Quarterly report pursuant to Section 13 or 15(d)

Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details)

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Summary of Significant Accounting Policies - Cash and Cash Equivalents (Details) - USD ($)
$ in Thousands
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]        
Cash and cash equivalents $ 310,655 $ 281,046    
Tax like-kind exchange escrow 1,978 1,978    
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 312,633 $ 283,024 $ 223,743 $ 303,645