XML 63 R49.htm IDEA: XBRL DOCUMENT v3.8.0.1
SEGMENT INFORMATION (Details)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2017
USD ($)
Sep. 30, 2017
USD ($)
Jun. 30, 2017
USD ($)
Mar. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Sep. 30, 2016
USD ($)
Jun. 30, 2016
USD ($)
Mar. 31, 2016
USD ($)
Dec. 31, 2017
USD ($)
segment
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Segment information                      
Number of operating segments | segment                 1    
Revenues derived from foreign subsidiaries $ 65,355 $ 64,968 $ 60,335 $ 61,354 $ 55,343 $ 61,040 $ 65,835 $ 63,675 $ 252,012 $ 245,893 $ 232,434
Identifiable assets 187,922       179,919       $ 187,922 $ 179,919  
Revenues                      
Segment information                      
Percentage of concentration risk                 18.00% 19.00% 24.00%
Trade receivables                      
Segment information                      
Percentage of concentration risk                 15.00%    
Outside the United States                      
Segment information                      
Revenues derived from foreign subsidiaries                 $ 119,212 $ 111,993 $ 80,029
Identifiable assets $ 84,652       $ 73,378       84,652 73,378  
Wholly owned foreign subsidiaries                      
Segment information                      
Revenues derived from foreign subsidiaries                 $ 107,039 $ 99,061 $ 75,509