SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 3) (USD $)	3 Months Ended		6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013	Jun. 30, 2012	Dec. 31, 2012
Variable Interest Entities
Net broadcast revenues	$ 279,270,000	$ 217,582,000	$ 532,195,000	$ 408,470,000
Station production expenses	85,694,000	62,596,000	166,127,000	122,393,000
Income from equity and cost method investments	(404,000)	5,148,000	(1,456,000)	6,424,000
VIEs which are not primary beneficiary
Variable Interest Entities
Carrying amount	30,658,000		30,658,000		30,983,000
Maximum exposure	30,658,000		30,658,000		30,983,000
Income from equity and cost method investments	300,000	5,300,000	700,000	6,700,000
Unfunded commitments related to private equity investment funds	16,900,000		16,900,000		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	3,517,000		3,517,000		3,648,000
Maximum exposure	3,517,000		3,517,000		3,648,000
Investments in investment companies
Variable Interest Entities
Carrying amount	27,141,000		27,141,000		27,335,000
Maximum exposure	$ 27,141,000		$ 27,141,000		$ 27,335,000