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Cash and Cash Equivalents (Tables)
 6 Months Ended
Jun. 30, 2019
CASH AND CASH EQUIVALENTS [Abstract]  
Cash and cash equivalents

 

June 30,
2019

 

December 31,
2018

 

Cash and cash equivalents

$33,884 

$58,590 

Restricted cash

1,336 

2,865 

 

 

 

Total cash and cash equivalents and restricted cash

$35,220 

$61,455