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
Mar. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Accounting Policies [Abstract]        
Cash and cash equivalents $ 104,951   $ 48,602  
Restricted cash 0   10,389  
Cash, cash equivalents and restricted cash at end of period $ 104,951 $ 149,285 $ 58,991 $ 141,549