DISCONTINUED OPERATIONS - SALE OF U.S. RETAIL WIRELESS BUSINESS (Details) (USD $)	3 Months Ended			0 Months Ended	1 Months Ended	3 Months Ended		1 Months Ended
	Mar. 31, 2013	Mar. 31, 2014	Dec. 31, 2013	Sep. 20, 2013 Alltel Sale AT&T Mobility	Mar. 31, 2014 Alltel Sale AT&T Mobility	Mar. 31, 2014 Alltel Sale AT&T Mobility	Mar. 31, 2013 Alltel Sale AT&T Mobility	Mar. 31, 2015 Alltel Sale AT&T Mobility Subsequent event	Sep. 30, 2014 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 escrowed cash					19,500,000
Restricted cash		58,796,000	39,000,000		58,500,000	58,500,000
Second release of escrowed cash									19,500,000
Third release of escrowed cash								39,500,000
Minority shareholders' interests in sold operations						10,200,000
Revenues and income from discontinued operations
Revenue from discontinued operations							108,037,000
Income from discontinued operations, net of tax expense	4,034,000						4,034,000
Income from discontinued operations, tax expense							$ 2,417,000