SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 3) (USD $)	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Variable Interest Entities
Net broadcast revenues	$ 252,925,000	$ 190,888,000
Station production expenses	80,433,000	59,797,000
Income from equity and cost method investments	(1,052,000)	1,276,000
VIEs which are not primary beneficiary
Variable Interest Entities
Carrying amount	31,903,000		30,983,000
Maximum exposure	31,903,000		30,983,000
Income from equity and cost method investments	400,000	1,400,000
Unfunded commitments related to private equity investment funds	17,900,000		8,900,000
Freedom
Variable Interest Entities
Net broadcast revenues		10,000,000
Station production expenses		7,800,000
Investments in real estate ventures
Variable Interest Entities
Carrying amount	3,621,000		3,648,000
Maximum exposure	3,621,000		3,648,000
Investments in investment companies
Variable Interest Entities
Carrying amount	28,282,000		27,335,000
Maximum exposure	$ 28,282,000		$ 27,335,000