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Segment Information (Tables)
 6 Months Ended
Jun. 30, 2019
SEGMENT INFORMATION [Abstract]  
Revenue By Geographic Region

 

Three Month
Period ended
June 30, 2019

 

Three Month
Period ended
June 30, 2018

 

Six Month
Period ended
June 30, 2019

 

Six Month
Period ended
June 30, 2018

 

Asia

$27,266 

$33,574 

$53,917 

$63,945 

Europe

20,334 

17,770 

38,245 

33,290 

North America

145 

5,200 

1,124 

11,025 

Australia

— 

1,652 

1,277 

2,988 

 

 

 

 

 

Total

$47,745 

$58,196 

$94,563 

$111,248