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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash and cash equivalents $ 30,657 $ 31,238 $ 27,160  
Restricted cash 108,704   13,776  
Total cash and cash equivalents and restricted cash shown in the statements of cash flows $ 139,361 $ 47,321 $ 40,936 $ 35,578