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LONG-TERM DEBT (Details) (USD $) |  |  | 1 Months Ended | 0 Months Ended | 3 Months Ended |  |  | 0 Months Ended |  | 3 Months Ended |  | 3 Months Ended |  |  | 3 Months Ended |  |  | 3 Months Ended |  | 1 Months Ended |  |  |  |  |
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Mar. 31, 2013 | Dec. 31, 2012 | May 31, 2011 Bermuda wireless operations | Sep. 16, 2011 Credit facility LIBOR | Sep. 16, 2011 Credit facility Base rate | Mar. 31, 2013 Amended Credit Facility | Mar. 31, 2013 Amended Credit Facility One-week LIBOR | Mar. 31, 2013 Amended Credit Facility One-month LIBOR | Mar. 31, 2013 Amended Credit Facility Maximum | Mar. 31, 2013 Term loans | Dec. 31, 2012 Term loans | May 18, 2012 Term loans Amended Credit Facility item | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility LIBOR | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility Base rate | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility Minimum LIBOR | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility Minimum Base rate | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility Maximum LIBOR | Mar. 31, 2013 Term Loan A-1 Amended Credit Facility Maximum Base rate | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility LIBOR | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility Base rate | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility Minimum LIBOR | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility Minimum Base rate | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility Maximum LIBOR | Mar. 31, 2013 Term Loan A-2 Amended Credit Facility Maximum Base rate | Mar. 31, 2013 Revolver loan Minimum LIBOR | Mar. 31, 2013 Revolver loan Minimum Base rate | Mar. 31, 2013 Revolver loan Maximum LIBOR | Mar. 31, 2013 Revolver loan Maximum Base rate | May 18, 2012 Revolver loan Amended Credit Facility | Mar. 31, 2013 Revolver loan Amended Credit Facility LIBOR | Mar. 31, 2013 Revolver loan Amended Credit Facility Base rate | Mar. 31, 2013 Revolver loan Amended Credit Facility Minimum | Mar. 31, 2013 Revolver loan Amended Credit Facility Maximum | Mar. 31, 2013 Swingline sub-facility Credit facility Minimum Base rate | Mar. 31, 2013 Swingline sub-facility Credit facility Maximum Base rate | May 18, 2012 Swingline sub-facility Amended Credit Facility | Mar. 31, 2013 Swingline sub-facility Amended Credit Facility Base rate | Mar. 31, 2013 Swingline sub-facility Amended Credit Facility Minimum Base rate | Mar. 31, 2013 Swingline sub-facility Amended Credit Facility Maximum Base rate | Oct. 31, 2012 Letter of credit sub-facility Amended Credit Facility | Mar. 31, 2013 Letter of credit sub-facility Amended Credit Facility | Oct. 29, 2012 Letter of credit sub-facility Amended Credit Facility | Mar. 31, 2013 Note Payable - Other | Dec. 31, 2012 Note Payable - Other | May 02, 2011 Note Payable - Other M3 Wireless, Ltd. Keytech Ltd.
Long-term debt |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Outstanding debt | $ 272,143,000 | $ 272,072,000 |  |  |  |  |  |  |  | $ 268,000,000 | $ 268,000,000 |  | $ 125,000,000 |  |  |  |  |  |  | $ 150,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 100,000 |  | $ 4,143,000 | $ 4,072,000 |
Less: current portion | (19,600,000) | (15,680,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total long-term debt | 252,543,000 | 256,392,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: debt discount | (5,237,000) | (5,492,000) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net carrying amount | 247,306,000 | 250,900,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum borrowing capacity |  |  |  |  |  |  |  |  |  |  |  | 275,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  | 10,000,000 |  |  |  |  |  | 55,000,000 |  |  |
Mobility Fund letters of credit outstanding |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |
Number of term loans |  |  |  |  |  |  |  |  |  |  |  | 2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum aggregate additional borrowings subject to lender approval |  |  |  |  |  |  |  |  |  |  |  | 100,000,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Description of variable rate basis |  |  |  | LIBOR | Base Rate |  | one-week LIBOR | one-month LIBOR |  |  |  |  |  | LIBOR | Base 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% | 3.50% | 2.50% |  |  |  | 2.50% | 1.50% | 4.00% | 3.00% | 2.00% | 1.00% | 3.50% | 2.50% |  |  |  |  |  | 0.50% | 2.00% |  |  | 0.50% | 2.00% |  |  |  |  |  |
Percentage of equity interests in certain domestic subsidiaries pledged |  |  |  |  |  | 100.00% |  |  | 65.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Weighted-average interest rate (as a percent) |  |  |  |  |  | 4.37% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Availability under the facility |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 99,900,000 |  |  |  |
Commitment fee (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 0.25% | 0.50% |  |  |  |  |  |  | 1.75% |  |  |  |  |
Term loan owed to related party |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 7,000,000
Ownership interest held by minority shareholder (as a percent) |  |  | 42.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Effective interest rate (as a percent) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 7.00%

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