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Consolidated Statements of Cash Flows (Unaudited) (Parenthetical) - USD ($)
$ in Thousands
Mar. 31, 2019
Dec. 31, 2018
Mar. 31, 2018
Dec. 31, 2017
Statement of Cash Flows [Abstract]        
Cash $ 2,331 $ 3,657 $ 3,247 $ 5,230
Restricted cash 38,917 46,484 19,064 16,787
Total cash and restricted cash $ 41,248 $ 50,141 $ 22,311 $ 22,017