LONG-TERM DEBT (Details) - USD ($) $ in Thousands			12 Months Ended			16 Months Ended
	Nov. 14, 2013	Jun. 17, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Sep. 20, 2013	Dec. 19, 2014	Aug. 31, 2013
Long-term debt
Total long-term debt			$ 26,575	$ 32,794
Amended Credit Facility [Member]
Long-term debt
Borrowings			0
Amended Credit Facility [Member] | Universal Service Administrative Company
Long-term debt
Outstanding letters of credit		$ 29,800
Ahana Debt
Long-term debt
Outstanding debt			$ 32,900
Term loans
Long-term debt
Interest expenses				$ 4,700
Term loans | Credit facility | One-week LIBOR
Long-term debt
Basis spread on variable rate (as a percent)						1.50%
Term loans | Credit facility | One-month LIBOR
Long-term debt
Basis spread on variable rate (as a percent)						1.50%
Term loans | Credit facility | Minimum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)						2.00%
Term loans | Credit facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)						1.00%
Term loans | Credit facility | Maximum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)						4.00%
Term loans | Credit facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)						3.00%
Revolving credit facility | Credit facility | Minimum
Long-term debt
Commitment fee (as a percent)				0.25%
Revolving credit facility | Credit facility | Minimum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)				2.00%
Revolving credit facility | Credit facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)				1.00%
Revolving credit facility | Credit facility | Maximum
Long-term debt
Commitment fee (as a percent)				0.50%
Revolving credit facility | Credit facility | Maximum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)				3.50%
Revolving credit facility | Credit facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)				2.50%
Revolving credit facility | Amended Credit Facility [Member]
Long-term debt
Maximum borrowing capacity							$ 225,000
Revolving credit facility | Amended Credit Facility [Member] | Minimum
Long-term debt
Commitment fee (as a percent)			0.175%
Revolving credit facility | Amended Credit Facility [Member] | Minimum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)			1.50%
Revolving credit facility | Amended Credit Facility [Member] | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)			0.50%
Revolving credit facility | Amended Credit Facility [Member] | Maximum
Long-term debt
Commitment fee (as a percent)			0.25%
Revolving credit facility | Amended Credit Facility [Member] | Maximum | LIBOR
Long-term debt
Basis spread on variable rate (as a percent)			1.75%
Revolving credit facility | Amended Credit Facility [Member] | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)			0.75%
Swingline sub-facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)			0.50%
Swingline sub-facility | Credit facility | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)				0.50%
Swingline sub-facility | Credit facility | Maximum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)				2.00%
Swingline sub-facility | Amended Credit Facility [Member]
Long-term debt
Maximum borrowing capacity							10,000
Swingline sub-facility | Amended Credit Facility [Member] | Minimum | Base rate
Long-term debt
Basis spread on variable rate (as a percent)			1.00%
Letter of credit sub-facility
Long-term debt
Outstanding letters of credit			$ 10,600					$ 10,600
Letter of credit sub-facility | Alltel Mobility Funds
Long-term debt
Termination of facility	$ 19,900
Letter of credit sub-facility | Amended Credit Facility [Member]
Long-term debt
Maximum borrowing capacity			55,000
Commitment fee (as a percent)					1.75%
Letter of credit sub-facility | Amended Credit Facility [Member] | Universal Service Administrative Company
Long-term debt
Outstanding letters of credit					$ 9,900
Letter of credit sub-facility | Amended Credit Facility [Member] | Alltel Mobility Funds
Long-term debt
Maximum borrowing capacity							$ 25,000
Amount of pending awards of mobility fund grants		$ 68,800
Ahana Renewables
Long-term debt
Long-term debt			$ 38,900
Ahana Renewables | Public Service Electric & Gas
Long-term debt
Effective interest rate (as a percent)			11.30%
Ahana Renewables | Minimum
Long-term debt
Effective interest rate (as a percent)			4.50%
Ahana Renewables | Maximum
Long-term debt
Effective interest rate (as a percent)			6.00%