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SEGMENT REPORTING (Details) (USD $) In Thousands, unless otherwise specified | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2013 | Sep. 30, 2013 | Jun. 30, 2013 | Mar. 31, 2013 | Dec. 31, 2012 | Sep. 30, 2012 | Jun. 30, 2012 | Mar. 31, 2012 | Dec. 31, 2013 item | Dec. 31, 2012 | Dec. 31, 2011
SEGMENT REPORTING |  |  |  |  |  |  |  |  |  |  |
Number of reportable segments |  |  |  |  |  |  |  |  | 4 |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue | $ 77,028 | $ 79,350 | $ 71,625 | $ 64,832 | $ 69,912 | $ 73,312 | $ 68,827 | $ 65,745 | $ 292,835 | $ 277,796 | $ 262,807
Depreciation and amortization |  |  |  |  |  |  |  |  | 48,737 | 50,587 | 51,250
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 4,454 | 3,323 | 2,737
Operating income (loss) | 16,063 | 20,038 | 15,906 | 12,078 | 21,120 | 16,171 | 10,933 | 8,414 | 64,085 | 56,638 | 43,362
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 254,632 |  |  |  | 238,324 |  |  |  | 254,632 | 238,324 |
Goodwill | 45,077 |  |  |  | 45,077 |  |  |  | 45,077 | 45,077 | 45,077
Total assets | 859,719 |  |  |  | 910,875 |  |  |  | 859,719 | 910,875 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 69,316 | 42,154 | 41,331
U.S. Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 107,930 | 102,817 | 98,704
International wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 91,432 | 81,463 | 73,004
Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 84,585 | 85,524 | 84,957
Equipment and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 8,888 | 7,992 | 6,142
Reconciling Items |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Depreciation and amortization |  |  |  |  |  |  |  |  | 2,967 | 2,625 | 1,889
Non-cash stock-based compensation |  |  |  |  |  |  |  |  | 3,805 | 3,324 | 2,766
Operating income (loss) |  |  |  |  |  |  |  |  | (25,978) | (21,040) | (16,920)
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 6,731 |  |  |  | 11,954 |  |  |  | 6,731 | 11,954 |
Total assets | 395,692 |  |  |  | 448,676 |  |  |  | 395,692 | 448,676 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 3,881 | 2,956 | 3,420
Reconciling Items | Discontinued operations |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Total assets | 4,748 |  |  |  | 380,765 |  |  |  | 4,748 | 380,765 |
U.S. Wireless |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 32,148 |  |  |  | 32,148 |  |  |  | 32,148 | 32,148 | 32,148
U.S. Wireless | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 109,005 | 103,768 | 99,260
Depreciation and amortization |  |  |  |  |  |  |  |  | 14,308 | 16,072 | 18,266
Operating income (loss) |  |  |  |  |  |  |  |  | 54,867 | 60,290 | 41,021
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 73,592 |  |  |  | 47,148 |  |  |  | 73,592 | 47,148 |
Goodwill | 32,148 |  |  |  | 32,148 |  |  |  | 32,148 | 32,148 |
Total assets | 146,346 |  |  |  | 161,038 |  |  |  | 146,346 | 161,038 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 34,895 | 9,792 | 7,773
U.S. Wireless | Operating segments | U.S. Wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 107,930 | 102,817 | 98,704
U.S. Wireless | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 610 | 603 | 556
U.S. Wireless | Operating segments | Equipment and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 465 | 348 |
International Integrated Telephony | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 93,446 | 94,135 | 92,441
Depreciation and amortization |  |  |  |  |  |  |  |  | 17,975 | 17,963 | 18,058
Operating income (loss) |  |  |  |  |  |  |  |  | 28,212 | 23,203 | 26,734
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 118,917 |  |  |  | 127,988 |  |  |  | 118,917 | 127,988 |
Total assets | 197,903 |  |  |  | 193,153 |  |  |  | 197,903 | 193,153 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 12,452 | 14,369 | 19,317
International Integrated Telephony | Operating segments | International wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 30,334 | 27,084 | 27,138
International Integrated Telephony | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 61,475 | 65,313 | 64,471
International Integrated Telephony | Operating segments | Equipment and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 1,637 | 1,738 | 832
Island Wireless |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 5,438 |  |  |  | 5,438 |  |  |  | 5,438 | 5,438 | 5,438
Island Wireless | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 67,653 | 60,096 | 51,176
Depreciation and amortization |  |  |  |  |  |  |  |  | 10,305 | 11,067 | 9,855
Operating income (loss) |  |  |  |  |  |  |  |  | 8,610 | (3,334) | (7,728)
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 29,310 |  |  |  | 33,745 |  |  |  | 29,310 | 33,745 |
Goodwill | 5,438 |  |  |  | 5,438 |  |  |  | 5,438 | 5,438 |
Total assets | 74,427 |  |  |  | 77,120 |  |  |  | 74,427 | 77,120 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 5,536 | 4,529 | 7,485
Island Wireless | Operating segments | International wireless |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 61,098 | 54,379 | 45,866
Island Wireless | Operating segments | Equipment and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 6,555 | 5,717 | 5,310
U.S. Wireline |  |  |  |  |  |  |  |  |  |  |
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Goodwill | 7,491 |  |  |  | 7,491 |  |  |  | 7,491 | 7,491 | 7,491
U.S. Wireline | Operating segments |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,731 | 19,797 | 19,930
Depreciation and amortization |  |  |  |  |  |  |  |  | 3,182 | 2,860 | 3,182
Operating income (loss) |  |  |  |  |  |  |  |  | (1,076) | (2,481) | 255
Segment Assets |  |  |  |  |  |  |  |  |  |  |
Net fixed assets | 26,082 |  |  |  | 17,489 |  |  |  | 26,082 | 17,489 |
Goodwill | 7,491 |  |  |  | 7,491 |  |  |  | 7,491 | 7,491 |
Total assets | 45,351 |  |  |  | 30,888 |  |  |  | 45,351 | 30,888 |
Capital Expenditures |  |  |  |  |  |  |  |  |  |  |
Capital expenditures |  |  |  |  |  |  |  |  | 12,552 | 10,508 | 3,336
U.S. Wireline | Operating segments | Wireline |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | 22,500 | 19,608 | 19,930
U.S. Wireline | Operating segments | Equipment and Other |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  |  |  |
Revenue |  |  |  |  |  |  |  |  | $ 231 | $ 189 |

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