COMMITMENTS AND CONTINGENCIES (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Operating leases of lessee
Total rental expense	$ 24,900,000	$ 27,000,000	$ 22,400,000
Minimum lease payment obligations under operating leases
2014	9,728,000
2015	6,503,000
2016	6,592,000
2017	6,688,000
2018	5,831,000
Thereafter	121,998,000
Total	157,340,000
Rights-of-way payments	6,100,000	7,400,000	6,600,000
Office Space and Other
Minimum lease payment obligations under operating leases
2014	3,551,000
2015	3,653,000
2016	3,742,000
2017	3,838,000
2018	2,981,000
Thereafter	8,627,000
Total	26,392,000
Equipment
Minimum lease payment obligations under operating leases
2014	3,314,000
Total	3,314,000
Land Leases
Minimum lease payment obligations under operating leases
2014	2,863,000
2015	2,850,000
2016	2,850,000
2017	2,850,000
2018	2,850,000
Thereafter	113,371,000
Total	$ 127,634,000