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Significant Accounting Policies (Details) - USD ($)
shares in Thousands, $ in Thousands
9 Months Ended 12 Months Ended
Jun. 24, 2015
Sep. 30, 2015
Dec. 31, 2014
Marketable and Non-Marketable Securities      
Net unrealized gains (losses) recorded in accumulated other comprehensive income (loss)   $ 9,700 $ 103,900
Carrying value of investments under the cost method   181,400 167,100
Gain on sale of investment   80,187  
Other-than-temporary non-cash charges   0 $ 0
Available for sale securities      
Marketable and Non-Marketable Securities      
Marketable securities   $ 216,800  
Number of shares owned 5,710    
Proceeds received from the sale of investments $ 454,000    
Available for sale securities | Securities in captive insurance subsidiary portfolio | Minimum      
Marketable and Non-Marketable Securities      
Investment maturity period   1 year  
Available for sale securities | Securities in captive insurance subsidiary portfolio | Maximum      
Marketable and Non-Marketable Securities      
Investment maturity period   10 years  
Available for sale securities | Other Income.      
Marketable and Non-Marketable Securities      
Gain on sale of investment   $ 80,200