GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS: (Details Textual) (USD $)	3 Months Ended	12 Months Ended
	Dec. 31, 2010	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		$ 313,000	$ 14,500,000	$ 36,100,000
Indefinite-Lived License Agreements		673,994,000	674,307,000
Goodwill, Impairment Loss	16,100,000		14,500,000
Amortization Of Intangible Assets		28,400,000	26,200,000	7,000,000
Deferred Finance Costs, Net	3,000,000	4,500,000	4,700,000	3,000,000
Interim Impairment Testing 2012 [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		313,000
Annual Impairment Testing 2011 [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			14,500,000
Year End Impairment Testing 2011 [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)			7,800,000
Licensing Agreements [Member]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)		313,000
Indefinite-Lived License Agreements		$ 674,000,000