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CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) Statement - USD ($)
$ in Thousands
Mar. 31, 2018
Dec. 31, 2017
Mar. 31, 2017
Dec. 31, 2016
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents [Abstract]        
Cash and cash equivalents $ 39,161 $ 31,238 $ 32,272  
Restricted cash 14,080   3,126  
Total cash and cash equivalents and restricted cash shown in the statements of cash flows $ 53,241 $ 47,321 $ 35,398 $ 35,578