CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) (USD $) In Thousands, except Share data, unless otherwise specified	Mar. 31, 2014	Dec. 31, 2013
Current Assets:
Accounts and notes receivable (less allowances)	$ 8,108	$ 6,853
SNI shareholders' equity:
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized (in shares)	25,000,000	25,000,000
Preferred stock, outstanding (in shares)	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Class A [Member]
SNI shareholders' equity:
Common stock, authorized (in shares)	240,000,000	240,000,000
Common stock, issued (in shares)	109,568,940	111,891,667
Common stock, outstanding (in shares)	109,568,940	111,891,667
Voting Common Stock [Member]
SNI shareholders' equity:
Common stock, authorized (in shares)	60,000,000	60,000,000
Common stock, issued (in shares)	34,317,171	34,317,171
Common stock, outstanding (in shares)	34,317,171	34,317,171