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SEGMENT REPORTING (Details 5) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue $ 142,535 $ 111,006 $ 399,573 $ 359,333  
Long-lived assets 96,235   96,235   $ 85,292
United States          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 120,789 92,198 340,322 312,252  
Long-lived assets 88,546   88,546   78,921
United Kingdom          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 16,537 13,423 46,516 37,170  
Other countries          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 5,209 $ 5,385 12,735 $ 9,911  
Long-lived assets $ 7,689   $ 7,689   $ 6,371