Quarterly report pursuant to Section 13 or 15(d)

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

v3.19.3
Summary of Significant Accounting Policies - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Sep. 30, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 249,881 $ 119,647    
Tax like-kind exchange escrow 0 3,799    
Total cash, cash equivalents and restricted cash shown in the statement of cash flows $ 249,881 $ 123,446 $ 110,617 $ 79,580