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SUPPLEMENTAL CASH FLOW INFORMATION (Tables)
3 Months Ended
Mar. 31, 2018
Supplemental Cash Flow Elements [Abstract]  
Reconciliation of cash and cash equivalents and restricted cash
    March 31,
    2018   2017
         
Cash and cash equivalents   $ 40,899     $ 52,817  
Restricted cash (cash held in escrow)     38,784       30,751  
Restricted cash (certificate of deposits)     10,652        
Restricted cash (held with Trustee)     5,947       2,975  
    $ 96,282     $ 86,543