Supplemental Stockholders' Equity Information Changes in Accumulated Other Comprehensive Income (Details) - USD ($) $ in Thousands		3 Months Ended		6 Months Ended
		Jun. 28, 2015	Jun. 29, 2014	Jun. 28, 2015	Jun. 29, 2014
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning				$ (533,795)
Income tax (benefit)/expense		$ 4,256	$ 2,440	20,576	$ 5,141
Other comprehensive income, net of tax		6,793	$ 3,977	31,284	7,871
Balance, ending		(502,562)		(502,562)
Foreign Currency Translation Adjustments
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning				5,705
Other comprehensive income before reclassifications, before tax	[1]			(6,620)
Amounts reclassified from accumulated other comprehensive loss, before tax	[1]			0
Income tax (benefit)/expense	[1]			(2,571)
Other comprehensive income, net of tax				(4,049)
Balance, ending		1,656		1,656
Funded Status of Plans
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning				(539,500)
Other comprehensive income before reclassifications, before tax	[1]			0
Amounts reclassified from accumulated other comprehensive loss, before tax	[1]			58,429
Income tax (benefit)/expense	[1]			23,147
Other comprehensive income, net of tax				35,282
Balance, ending		(504,218)		(504,218)
Total Accumulated Other Comprehensive Loss
Accumulated Other Comprehensive Income (Loss) [Roll Forward]
Balance, beginning				(533,795)
Other comprehensive income before reclassifications, before tax	[1]			(6,620)
Amounts reclassified from accumulated other comprehensive loss, before tax	[1]			58,429
Income tax (benefit)/expense	[1]			20,576
Other comprehensive income, net of tax				31,233	$ 7,871
Balance, ending		$ (502,562)		$ (502,562)

[1] All amounts are shown net of noncontrolling interest.