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Condensed Consolidated Statements of Cash Flows (Cash Reconciliation) - USD ($)
$ in Thousands
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2016
Statement of Cash Flows [Abstract]      
Cash and cash equivalents $ 50,943 $ 35,629 $ 35,629
Restricted cash 1,200 2,010 2,010
Total cash, cash equivalents and restricted cash $ 52,143 $ 37,639 $ 37,639