SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 3) (USD $)	3 Months Ended		9 Months Ended		3 Months Ended		9 Months Ended			3 Months Ended	9 Months Ended
	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Sep. 30, 2013 VIEs which are not primary beneficiary	Sep. 30, 2012 VIEs which are not primary beneficiary	Sep. 30, 2013 VIEs which are not primary beneficiary	Sep. 30, 2012 VIEs which are not primary beneficiary	Dec. 31, 2012 VIEs which are not primary beneficiary	Jun. 30, 2012 Freedom	Sep. 30, 2012 Freedom	Sep. 30, 2013 Investments in real estate ventures	Dec. 31, 2012 Investments in real estate ventures	Sep. 30, 2013 Investments in investment companies	Dec. 31, 2012 Investments in investment companies
Variable Interest Entities
Net broadcast revenues	$ 303,028,000	$ 225,023,000	$ 835,223,000	$ 633,493,000							$ 10,000,000
Station production expenses	98,939,000	61,705,000	265,066,000	184,098,000						7,800,000
Carrying amount					29,609,000		29,609,000		30,983,000			3,545,000	3,648,000	26,064,000	27,335,000
Maximum exposure					29,609,000		29,609,000		30,983,000			3,545,000	3,648,000	26,064,000	27,335,000
Income from equity and cost method investments	1,571,000	1,919,000	115,000	8,343,000	700,000	300,000	1,400,000	7,000,000
Unfunded commitments related to private equity investment funds					$ 16,900,000		$ 16,900,000		$ 8,900,000