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DISCONTINUED OPERATIONS - SALE OF U.S. RETAIL WIRELESS BUSINESS (Details) (USD $) | 3 Months Ended | 9 Months Ended |  |  | 0 Months Ended | 1 Months Ended | 3 Months Ended | 9 Months Ended | 1 Months Ended
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Sep. 30, 2013 | Sep. 30, 2013 | Sep. 30, 2014 | Dec. 31, 2013 | Sep. 20, 2013 Alltel Sale AT&T Mobility | Sep. 30, 2014 Alltel Sale AT&T Mobility | Mar. 31, 2014 Alltel Sale AT&T Mobility | Sep. 30, 2013 Alltel Sale AT&T Mobility | Sep. 30, 2014 Alltel Sale AT&T Mobility | Sep. 30, 2013 Alltel Sale AT&T Mobility | Mar. 31, 2015 Alltel Sale AT&T Mobility Subsequent event
SALE OF U.S. RETAIL WIRELESS BUSINESS |  |  |  |  |  |  |  |  |  |  |
Cash proceeds |  |  |  |  | $ 780,000,000 |  |  |  |  |  |
Working capital adjustments |  |  |  |  | 16,800,000 |  |  |  |  |  |
Total cash proceeds including working capital adjustments |  |  |  |  | 796,800,000 |  |  |  |  |  |
Cash held in escrow |  |  |  |  | 78,000,000 |  |  |  |  |  |
First release of amount of escrowed cash |  |  |  |  |  | 19,500,000 | 19,500,000 |  | 39,000,000 |  |
Restricted cash |  |  | 39,293,000 | 39,000,000 |  | 39,000,000 |  |  | 39,000,000 |  |
Third release of amount of escrowed cash |  |  |  |  |  |  |  |  |  |  | 39,000,000
Minority shareholders' interests in sale of operations | 28,699,000 | 28,699,000 |  |  |  |  |  |  | 7,300,000 |  |
Revenues and income from discontinued operations |  |  |  |  |  |  |  |  |  |  |
Revenue from discontinued operations |  |  |  |  |  |  |  | 88,036,000 |  | 299,519,000 |
Income from discontinued operations, net of tax expense (benefit) | (1,960,000) | 5,166,000 |  |  |  |  |  | (1,960,000) |  | 5,166,000 |
Income from discontinued operations, tax expense (benefit) |  |  |  |  |  |  |  | $ (1,900,000) |  | $ 5,200,000 |

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