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LONG-TERM DEBT (Details) (USD $)
12 Months Ended 1 Months Ended 0 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 0 Months Ended 12 Months Ended 1 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
May 31, 2011
Bermuda wireless operations
Sep. 16, 2011
Credit facility
LIBOR
Sep. 16, 2011
Credit facility
Base rate
Sep. 16, 2011
Credit facility
Minimum
LIBOR
Sep. 16, 2011
Credit facility
Minimum
Base rate
Sep. 16, 2011
Credit facility
Maximum
LIBOR
Sep. 16, 2011
Credit facility
Maximum
Base rate
Dec. 31, 2012
Amended Credit Facility
Dec. 31, 2012
Amended Credit Facility
One-week LIBOR
Dec. 31, 2012
Amended Credit Facility
One-month LIBOR
Dec. 31, 2012
Amended Credit Facility
Maximum
Dec. 31, 2012
Term loans
Dec. 31, 2011
Term loans
Sep. 30, 2010
Term loans
Credit facility
May 18, 2012
Term loans
Amended Credit Facility
Item
May 18, 2012
Term Loan A-1
Amended Credit Facility
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
LIBOR
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
Base rate
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
Minimum
LIBOR
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
Minimum
Base rate
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
Maximum
LIBOR
Dec. 31, 2012
Term Loan A-1
Amended Credit Facility
Maximum
Base rate
May 18, 2012
Term Loan A-2
Amended Credit Facility
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
LIBOR
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
Base rate
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
Minimum
LIBOR
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
Minimum
Base rate
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
Maximum
LIBOR
Dec. 31, 2012
Term Loan A-2
Amended Credit Facility
Maximum
Base rate
Dec. 31, 2011
Revolver loan
Sep. 30, 2010
Revolver loan
Credit facility
May 18, 2012
Revolver loan
Amended Credit Facility
Dec. 31, 2012
Revolver loan
Amended Credit Facility
LIBOR
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Base rate
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Minimum
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Minimum
LIBOR
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Minimum
Base rate
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Maximum
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Maximum
LIBOR
Dec. 31, 2012
Revolver loan
Amended Credit Facility
Maximum
Base rate
Sep. 30, 2010
Swingline sub-facility
Credit facility
Sep. 16, 2011
Swingline sub-facility
Credit facility
Base rate
Sep. 16, 2011
Swingline sub-facility
Credit facility
Minimum
Base rate
Sep. 16, 2011
Swingline sub-facility
Credit facility
Maximum
Base rate
May 18, 2012
Swingline sub-facility
Amended Credit Facility
Dec. 31, 2012
Swingline sub-facility
Amended Credit Facility
Base rate
Dec. 31, 2012
Swingline sub-facility
Amended Credit Facility
Minimum
Base rate
Dec. 31, 2012
Swingline sub-facility
Amended Credit Facility
Maximum
Base rate
Oct. 31, 2012
Letter of credit sub-facility
Amended Credit Facility
Dec. 31, 2012
Letter of credit sub-facility
Amended Credit Facility
Oct. 29, 2012
Letter of credit sub-facility
Amended Credit Facility
Dec. 31, 2012
Note Payable - Other
Dec. 31, 2011
Note Payable - Other
May 02, 2011
Note Payable - Other
M3 Wireless, Ltd.
Keytech Ltd.
Long-term debt                                                                                                                  
Outstanding debt $ 272,072,000 $ 286,021,000                         $ 268,000,000 $ 252,113,000     $ 125,000,000             $ 150,000,000             $ 28,156,000                                       $ 100,000   $ 4,072,000 $ 5,752,000  
Less: current portion (15,680,000) (25,068,000)                                                                                                              
Total long-term debt 256,392,000 260,953,000                                                                                                              
Less: debt discount (5,492,000) (3,807,000)                                                                                                              
Net carrying amount 250,900,000 257,146,000                                                                                                              
Maximum borrowing capacity                                 275,000,000 275,000,000                               100,000,000 100,000,000                 10,000,000       10,000,000           55,000,000      
Number of term loans                                   2                                                                              
Maximum aggregate additional borrowings subject to lender approval                                 50,000,000 100,000,000                                                                              
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       Base Rate                
Basis spread on variable rate (as a percent)             2.75% 1.75% 4.25% 3.25%   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%     1.25% 2.75%     0.50% 2.00%            
Percentage of equity interests in certain domestic subsidiaries pledged                     100.00%                                                                                            
Percentage of equity interests in certain foreign subsidiaries pledged                           65.00%                                                                                      
Weighted-average interest rate (as a percent)                     4.36%                                                                                            
Availability under the facility                                                                                                         99,900,000        
Payment of debt issuance costs 3,564,000 1,037,000 4,321,000               3,600,000                                                                                            
Deferred financing costs                     700,000                                                                                            
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%
Commitment fee (as a percent)                                                                           0.25%     0.50%                     1.75%          
Future principal repayments                                                                                                                  
2013 15,680,000                                                                                                                
2014 15,900,000                                                                                                                
2015 14,492,000                                                                                                                
2016 14,000,000                                                                                                                
2017 70,250,000                                                                                                                
Thereafter 141,750,000                                                                                                                
Total principal repayments $ 272,072,000 $ 286,021,000                         $ 268,000,000 $ 252,113,000     $ 125,000,000             $ 150,000,000             $ 28,156,000                                       $ 100,000   $ 4,072,000 $ 5,752,000