PROPERTY AND EQUIPMENT, NET (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Property and equipment
Total cost	$ 90,831	$ 78,987
Accumulated depreciation	(43,630)	(32,688)
Net book value	47,201	46,299
Depreciation expense	9,212	7,624	5,470
Maximum
Property and equipment
Useful life	3 years
Minimum
Property and equipment
Useful life	25 years
Broadcasting equipment
Property and equipment
Total cost	50,465	45,476
Broadcasting equipment | Maximum
Property and equipment
Useful life	7 years
Broadcasting equipment | Minimum
Property and equipment
Useful life	2 years 9 months
Office equipment and other
Property and equipment
Total cost	16,842	14,080
Office equipment and other | Maximum
Property and equipment
Useful life	5 years
Office equipment and other | Minimum
Property and equipment
Useful life	3 years
Buildings
Property and equipment
Total cost	15,483	12,152
Buildings | Maximum
Property and equipment
Useful life	25 years
Buildings | Minimum
Property and equipment
Useful life	10 years
Leasehold improvements
Property and equipment
Useful life	10 years
Total cost	6,779	6,232
Construction in progress
Property and equipment
Total cost	$ 1,262	$ 1,047