NATURE OF OPERATIONS AND SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES: (Details 3) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Variable Interest Entities
Net broadcast revenues	$ 1,782,726,000	$ 1,217,504,000	$ 920,593,000
Station production expenses	577,013,000	385,104,000	255,556,000
Income (loss) from equity and cost method investments	2,313,000	621,000	9,670,000
VIEs which are not primary beneficiary
Variable Interest Entities
Carrying amount	22,700,000	26,700,000
Income (loss) from equity and cost method investments	$ 2,200,000	$ 2,100,000	$ 6,400,000