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LONG-TERM DEBT (Details) (USD $) |  | 1 Months Ended | 12 Months Ended | 0 Months Ended | 9 Months Ended | 0 Months Ended | 9 Months Ended | 12 Months Ended |  |  | 0 Months Ended | 9 Months Ended | 0 Months Ended | 12 Months Ended |  | 12 Months Ended |  | 12 Months Ended |  | 0 Months Ended |  |  |
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Dec. 31, 2012 | May 31, 2011 Bermuda wireless operations | Dec. 31, 2013 Bermuda wireless operations | Sep. 20, 2013 Amended Credit Facility One-week LIBOR | Sep. 20, 2013 Amended Credit Facility One-week LIBOR | Sep. 20, 2013 Amended Credit Facility One-month LIBOR | Sep. 20, 2013 Amended Credit Facility One-month LIBOR | Sep. 20, 2013 Amended Credit Facility Prime Rate | Dec. 31, 2013 Term loans | Sep. 20, 2013 Term loans item | Dec. 31, 2012 Term loans | May 18, 2012 Term loans Amended Credit Facility item | Sep. 20, 2013 Term loans Amended Credit Facility LIBOR | Sep. 20, 2013 Term loans Amended Credit Facility Base rate | Sep. 20, 2013 Term loans Amended Credit Facility Minimum LIBOR | Sep. 20, 2013 Term loans Amended Credit Facility Minimum Base rate | Sep. 20, 2013 Term loans Amended Credit Facility Maximum LIBOR | Sep. 20, 2013 Term loans Amended Credit Facility Maximum Base rate | Dec. 31, 2013 Revolver loan Minimum LIBOR | Dec. 31, 2013 Revolver loan Minimum Base rate | Dec. 31, 2013 Revolver loan Maximum LIBOR | Dec. 31, 2013 Revolver loan Maximum Base rate | May 18, 2012 Revolver loan Amended Credit Facility | Dec. 31, 2013 Revolver loan Amended Credit Facility LIBOR | Dec. 31, 2013 Revolver loan Amended Credit Facility Base rate | Dec. 31, 2013 Revolver loan Amended Credit Facility Minimum | Dec. 31, 2013 Revolver loan Amended Credit Facility Maximum | May 18, 2012 Swingline sub-facility Amended Credit Facility | Dec. 31, 2013 Swingline sub-facility Amended Credit Facility Base rate | Dec. 31, 2013 Swingline sub-facility Amended Credit Facility Minimum Base rate | Dec. 31, 2013 Swingline sub-facility Amended Credit Facility Maximum Base rate | Jun. 30, 2013 Letter of credit sub-facility | Nov. 14, 2013 Letter of credit sub-facility Alltel Mobility Funds | Jun. 17, 2013 Letter of credit sub-facility Amended Credit Facility | Dec. 31, 2013 Letter of credit sub-facility Amended Credit Facility | Dec. 31, 2012 Note payable - other | May 02, 2011 Note payable - other M3 Wireless, Ltd. Keytech Ltd.
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt | $ 272,072,000 |  |  |  |  |  |  |  |  |  | $ 268,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 4,072,000 |
Less: current portion | (15,680,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 256,392,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: debt discount | (5,492,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount | 250,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  | 10,000,000 |  |  |  |  |  |  | 55,000,000 |  |
Outstanding letters of credit |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 29,800,000 |  | 29,800,000 | 9,900,000 |  |
Amount of pending awards of mobility fund grants |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 68,800,000 |  |  |
Termination of facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 19,900,000 |  |  |  |
Number of term loans |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate additional borrowings subject to lender approval |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of loans repaid in full |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expenses |  |  |  |  |  |  |  |  | 4,700,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  |  | one-week LIBOR |  | one-month LIBOR | Prime Rate |  |  |  |  | LIBOR | Base Rate |  |  |  |  |  |  |  |  |  | LIBOR | Base Rate |  |  |  | Base Rate |  |  |  |  |  |  |  |
Basis spread on variable rate (as a percent) |  |  |  | 1.50% |  | 1.50% |  |  |  |  |  |  |  |  | 2.00% | 1.00% | 4.00% | 3.00% | 2.00% | 1.00% | 3.50% | 2.50% |  |  |  |  |  |  |  | 0.50% | 2.00% |  |  |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.50% |  |  |  |  |  |  | 1.75% |  |  |
Term loan assumed |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
Ownership interest held by minority shareholder (as a percent) |  | 42.00% | 42.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00%

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