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SEGMENT REPORTING (Details 5) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue $ 138,010 $ 125,056 $ 257,038 $ 248,327  
Long-lived assets 94,044   94,044   $ 85,292
United States          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 117,865 109,862 219,533 220,054  
Long-lived assets 87,389   87,389   78,921
United Kingdom          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 16,289 12,415 29,979 23,747  
Other countries          
Revenue and long-lived assets excluding intangible assets, by geographical area          
Revenue 3,856 $ 2,779 7,526 $ 4,526  
Long-lived assets $ 6,655   $ 6,655   $ 6,371