Investments Total Investments (Details) - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 28, 2014
Investments [Abstract]
Equity method investments	$ 1,642,737	$ 1,689,996
Cost method investments	20,918	18,238
Marketable equity securities	5,926	8,958
Total investments	$ 1,669,581	$ 1,717,192