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Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Mar. 31, 2020
Dec. 31, 2019
Accounting Policies [Abstract]    
Cash and cash equivalents $ 116,465 $ 70,629
Overnight money market funds 0 39,600
Restricted cash $ 216,902 $ 64,035