Annual report pursuant to Section 13 and 15(d)

NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Cash, Cash Equivalents and Restricted Cash (Details)

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NATURE OF OPERATIONS AND ACCOUNTING POLICIES - Cash, Cash Equivalents and Restricted Cash (Details) - USD ($)
$ in Thousands
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Cash and Cash Equivalents [Abstract]        
Cash and cash equivalents $ 117,366 $ 50,753 $ 13,583  
Restricted cash 0 0 3,250  
Total cash, cash equivalents and restricted cash shown in the Consolidated Statement of Cash Flows $ 117,366 $ 50,753 $ 16,833 $ 30,727