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Condensed Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Statement of Cash Flows [Abstract]      
Restricted cash, beginning balance $ 119 $ 5,282 $ 5,287
Restricted cash, ending balance $ 114 $ 119 $ 5,282