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Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Jun. 30, 2018
Dec. 31, 2017
Jun. 30, 2017
Dec. 31, 2016
Statement of Cash Flows [Abstract]        
Cash $ 2,799 $ 5,230 $ 3,678 $ 4,446
Restricted cash 26,356 16,787 10,630 8,297
Total cash and restricted cash $ 29,155 $ 22,017 $ 14,308 $ 12,743