Broadcast Rights and Other Broadcast Commitments (Details Textual) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Broadcast Rights and Other Broadcast Commitments (Additional Textual) [Abstract]
Commitments under license agreements	$ 18.3
Commitments for right to sell available advertising time for third party radio station	2.2
Broadcast licenses [Member]
Broadcast Rights and Other Broadcast Commitments (Textual) [Abstract]
Broadcast rights acquired under contractual arrangements	$ 9.8	$ 10.8	$ 11.9