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Accumulated Other Comprehensive Income (Loss) (Details) - Jun. 30, 2015 - USD ($)
$ in Thousands
Total
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income, Balance at December 28, 2014 $ (46,541)
Other comprehensive income (loss) (9,398)
Accumulated Other Comprehensive Income, Balance at June 30, 2015 (55,939)
Unrecognized Benefit Plan Gains and Losses  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income, Balance at December 28, 2014 (49,323)
Other comprehensive income (loss) (2,687)
Accumulated Other Comprehensive Income, Balance at June 30, 2015 (52,010)
Foreign Currency Translation Adjustments  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income, Balance at December 28, 2014 (2,665)
Other comprehensive income (loss) (4,868)
Accumulated Other Comprehensive Income, Balance at June 30, 2015 (7,533)
Unrealized Holding Gains on Marketable Securities  
Accumulated Other Comprehensive Income (Loss) [Line Items]  
Accumulated Other Comprehensive Income, Balance at December 28, 2014 5,447
Other comprehensive income (loss) (1,843)
Accumulated Other Comprehensive Income, Balance at June 30, 2015 $ 3,604