Selling Arrangement (Narrative) (Details) (News America Settlement Agreement [Member], USD $) In Thousands, unless otherwise specified	1 Months Ended	3 Months Ended		9 Months Ended
	Feb. 28, 2011	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
News America Settlement Agreement [Member]
Gain Contingencies [Line Items]
Settlement agreement, amount received	$ 125,000				$ 125,000
Settlement agreement, amount paid	4,000
Settlement agreement, term	10 years
Settlement agreement, amortization expense		100	100	300	183
Settlement agreement, expected yearly amortization expense, year one		400		400
Settlement agreement, expected yearly amortization expense, year two		400		400
Settlement agreement, expected yearly amortization expense, year three		400		400
Settlement agreement, expected yearly amortization expense, year four		400		400
Settlement agreement, expected yearly amortization expense, year five		$ 400		$ 400
Settlement agreement, expected yearly amortization expense, term				5 years