CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets:
Allowance for doubtful accounts receivable, current	$ 12,569	$ 7,889
Accumulated depreciation of property and equipment	$ 299,153	$ 278,552
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
Common Class A [Member]
SNI shareholders’ equity:
Common stock, authorized (in shares)	240,000,000	240,000,000
Common stock, issued (in shares)	94,838,600	97,789,910
Common stock, outstanding (in shares)	94,838,600	97,789,910
Voting Common Stock [Member]
SNI shareholders’ equity:
Common stock, authorized (in shares)	60,000,000	60,000,000
Common stock, issued (in shares)	33,850,481	34,317,171
Common stock, outstanding (in shares)	33,850,481	34,317,171