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Segment Information (Tables)
12 Months Ended
Dec. 31, 2016
SEGMENT INFORMATION [Abstract]  
Segments Summarized Financial Information
 
 
 
 
 
 
 
Year Ended
December 31,
2016
 
 
Year Ended
December 31,
2015
 
 
Year Ended
December 31,
2014
 
Asia
$      112,019      
 
$      133,542      
 
$      125,572      
Europe
      54,006      
 
      70,121      
 
      64,858      
North America
      13,364      
 
      10,557      
 
      19,943      
Australia
      11,135      
 
      9,456      
 
      16,983      
 
 
 
 
 
 
Total
$      190,524
 
$      223,676      
 
$      227,356