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Summary of Significant Accounting Policies (Cash and Cash Equivalents) (Details) - USD ($)
$ in Thousands
Sep. 30, 2019
Dec. 31, 2018
Accounting Policies [Abstract]    
Cash and cash equivalents $ 154,193 $ 51,965
Overnight money market funds 130,400 30,000
Restricted cash $ 38,998 $ 36,744