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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
	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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