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OPERATING SEGMENTS - Summary of operating results for business segments - (Details) (USD $)
In Thousands, unless otherwise specified
 3 Months Ended 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Sep. 30, 2014
Sep. 30, 2013
Segment profit:        
Exit activities, restructuring and impairments $ 56 $ 274 $ 3,001 $ 1,206
Loss from operations (3,035) (1,354) (12,086) (1,632)
Non-operating expenses (6,550) (2,496) (20,331) (8,003)
Loss before income taxes and equity in (earnings) of equity-method investment (9,585) (3,850) (32,417) (9,635)
Operating segments
        
Revenues:        
Total revenues 84,667 69,572 250,696 209,255
Direct costs of network, sales and services, exclusive of depreciation and amortization:        
Total direct costs of network, sales and services, exclusive of depreciation and amortization 37,148 32,795 109,470 98,319
Segment profit:        
Total segment profit 47,519 36,777 141,226 110,936
Operating segments | Data center services
        
Revenues:        
Total revenues 61,640 45,488 181,318 135,461
Direct costs of network, sales and services, exclusive of depreciation and amortization:        
Total direct costs of network, sales and services, exclusive of depreciation and amortization 27,716 23,171 80,170 68,461
Segment profit:        
Total segment profit 33,924 22,317 101,148 67,000
Operating segments | IP services
        
Revenues:        
Total revenues 23,027 24,084 69,378 73,794
Direct costs of network, sales and services, exclusive of depreciation and amortization:        
Total direct costs of network, sales and services, exclusive of depreciation and amortization 9,432 9,624 29,300 29,858
Segment profit:        
Total segment profit 13,595 14,460 40,078 43,936
Segment reconciling items
        
Segment profit:        
Exit activities, restructuring and impairments 56 274 3,001 1,206
Other operating expenses, including direct costs of customer support, depreciation and amortization 50,498 37,857 150,311 111,362
Loss from operations (3,035) (1,354) (12,086) (1,632)
Non-operating expenses 6,550 2,496 20,331 8,003
Loss before income taxes and equity in (earnings) of equity-method investment $ (9,585) $ (3,850) $ (32,417) $ (9,635)