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Cash and Cash Equivalents (Tables)
 6 Months Ended
Jun. 30, 2018
CASH AND CASH EQUIVALENTS [Abstract]  
Cash and cash equivalents

 

 

 

 

June 30,
2018

 

December 31,
2017

 

Cash and cash equivalents

$                  40,577 

$                   24,047 

Restricted cash

402 

5,886 

 

 

 

Total cash and cash equivalents and restricted cash

$                  40,979 

$                   29,933