CONDENSED CONSOLIDATED BALANCE SHEETS (UNAUDITED) (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2016	Dec. 31, 2015
Current assets:
Allowance for doubtful accounts receivable, current	$ 16,253	$ 12,569
Accumulated depreciation of property and equipment	$ 324,982	$ 299,153
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)	95,170,859	94,838,600
Common stock, outstanding (in shares)	95,170,859	94,838,600
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	33,850,481
Common stock, outstanding (in shares)	33,850,481	33,850,481