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SEGMENT REPORTING (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 6 Months Ended
Jun. 30, 2014
Jun. 30, 2013
Jun. 30, 2014
item
Jun. 30, 2013
Dec. 31, 2013
SEGMENT REPORTING          
Number of reportable segments     4    
Revenue          
Revenue $ 83,269 $ 71,626 $ 158,443 $ 136,458  
Depreciation and amortization 12,930 12,195 24,910 24,183  
Non-cash stock-based compensation 1,323 1,166 2,379 1,972  
Operating income (loss) 21,607 15,907 37,855 27,986  
Segment Assets          
Net fixed assets 253,027   253,027   254,632
Goodwill 45,077   45,077   45,077
Total assets 830,764   830,764   859,719
Capital Expenditures          
Capital expenditures     25,104 39,696  
U.S. wireless
         
Revenue          
Revenue 37,456 26,589 65,848 47,802  
International wireless
         
Revenue          
Revenue 22,422 21,837 45,570 43,267  
Wireline
         
Revenue          
Revenue 21,283 20,877 42,813 41,441  
Equipment and other
         
Revenue          
Revenue 2,108 2,323 4,212 3,948  
Reconciling Items
         
Revenue          
Depreciation and amortization 1,284 309 1,899 587  
Non-cash stock-based compensation 1,323 1,166 2,379 1,972  
Operating income (loss) (7,224) (5,439) (12,480) (10,164)  
Segment Assets          
Net fixed assets 13,778   13,778   6,731
Total assets 266,314   266,314   390,944
Capital Expenditures          
Capital expenditures     1,253 1,623  
U.S. Wireless | Discontinued operations
         
Segment Assets          
Total assets 169   169   4,748
U.S. Wireless | Operating segments
         
Revenue          
Revenue 37,815 26,844 66,538 48,312  
Depreciation and amortization 3,453 3,997 6,756 8,080  
Operating income (loss) 22,651 12,934 36,239 22,179  
Segment Assets          
Net fixed assets 72,244   72,244   73,592
Goodwill 32,148   32,148   32,148
Total assets 244,308   244,308   151,094
Capital Expenditures          
Capital expenditures     14,845 23,357  
U.S. Wireless | Operating segments | U.S. wireless
         
Revenue          
Revenue 37,456 26,589 65,848 47,802  
U.S. Wireless | Operating segments | Wireline
         
Revenue          
Revenue 152 152 305 305  
U.S. Wireless | Operating segments | Equipment and other
         
Revenue          
Revenue 207 103 386 205  
International Integrated Telephony | Operating segments
         
Revenue          
Revenue 21,397 22,208 43,195 44,900  
Depreciation and amortization 4,400 4,535 8,713 8,925  
Operating income (loss) 4,594 6,235 10,229 12,568  
Segment Assets          
Net fixed assets 114,557   114,557   118,917
Total assets 200,209   200,209   197,903
Capital Expenditures          
Capital expenditures     6,072 6,116  
International Integrated Telephony | Operating segments | International wireless
         
Revenue          
Revenue 6,758 6,530 13,655 13,284  
International Integrated Telephony | Operating segments | Wireline
         
Revenue          
Revenue 14,445 15,170 29,151 30,853  
International Integrated Telephony | Operating segments | Equipment and other
         
Revenue          
Revenue 194 508 389 763  
Island Wireless | Operating segments
         
Revenue          
Revenue 17,305 16,962 35,228 32,856  
Depreciation and amortization 2,607 2,560 5,215 5,155  
Operating income (loss) 2,552 2,301 5,978 3,935  
Segment Assets          
Net fixed assets 26,450   26,450   29,310
Goodwill 5,438   5,438   5,438
Total assets 76,897   76,897   74,427
Capital Expenditures          
Capital expenditures     1,958 1,911  
Island Wireless | Operating segments | International wireless
         
Revenue          
Revenue 15,664 15,307 31,915 29,983  
Island Wireless | Operating segments | Equipment and other
         
Revenue          
Revenue 1,641 1,655 3,313 2,873  
U.S. Wireline | Operating segments
         
Revenue          
Revenue 6,752 5,612 13,482 10,390  
Depreciation and amortization 1,186 794 2,327 1,436  
Operating income (loss) (966) (124) (2,040) (532)  
Segment Assets          
Net fixed assets 25,987   25,987   26,082
Goodwill 7,491   7,491   7,491
Total assets 43,034   43,034   45,351
Capital Expenditures          
Capital expenditures     976 6,689  
U.S. Wireline | Operating segments | Wireline
         
Revenue          
Revenue 6,686 5,555 13,357 10,283  
U.S. Wireline | Operating segments | Equipment and other
         
Revenue          
Revenue $ 66 $ 57 $ 125 $ 107