GOODWILL, RADIO BROADCASTING LICENSES AND OTHER INTANGIBLE ASSETS: (Details 1) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Radio Broadcasting Licenses	$ 673,994	$ 674,307
Indefinite-Lived Intangible Assets, Impairment Losses	(313)	(14,500)	(36,100)
Unit Of Accounting 2 [Member]
Radio Broadcasting Licenses	3,086	3,086
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 4 [Member]
Radio Broadcasting Licenses	9,169	9,482
Indefinite-Lived Intangible Assets, Impairment Losses	(313)
Unit Of Accounting 5 [Member]
Radio Broadcasting Licenses	18,657	18,657
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 7 [Member]
Radio Broadcasting Licenses	16,165	16,165
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 14 [Member]
Radio Broadcasting Licenses	20,434	20,434
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 15 [Member]
Radio Broadcasting Licenses	20,886	20,886
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 11 [Member]
Radio Broadcasting Licenses	21,135	21,135
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 9 [Member]
Radio Broadcasting Licenses	34,270	34,270
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 6 [Member]
Radio Broadcasting Licenses	26,242	26,242
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 16 [Member]
Radio Broadcasting Licenses	52,965	52,965
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 13 [Member]
Radio Broadcasting Licenses	52,556	52,556
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 8 [Member]
Radio Broadcasting Licenses	66,715	66,715
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 12 [Member]
Radio Broadcasting Licenses	58,779	58,779
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 1 [Member]
Radio Broadcasting Licenses	93,394	93,394
Indefinite-Lived Intangible Assets, Impairment Losses	0
Unit Of Accounting 10 [Member]
Radio Broadcasting Licenses	179,541	179,541
Indefinite-Lived Intangible Assets, Impairment Losses	$ 0