Annual report pursuant to Section 13 and 15(d)

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

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Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Accounting Policies [Abstract]        
Cash and cash equivalents $ 303,645 $ 119,647    
Tax like-kind exchange escrow 0 3,799    
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 303,645 $ 123,446 $ 79,580 $ 49,418