Employee Benefit Plans (Benefits Expected to be Paid in Future Years) (Details) (USD $)	12 Months Ended
	Dec. 31, 2014	Dec. 25, 2013
Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	$ 2,500,000	$ 2,800,000
Benefits expected to be paid:
2015	3,608,000
2016	3,530,000
2017	3,480,000
2018	3,529,000
2019	3,627,000
2020 through 2024	20,548,000
Other Defined Benefit Plans [Member]
Defined Benefit Plan Disclosure [Line Items]
Employer contributions	424,000	195,000
Estimated employer contributions during 2015	200,000
Benefits expected to be paid:
2015	224,000
2016	280,000
2017	232,000
2018	236,000
2019	420,000
2020 through 2024	1,169,000
Minimum [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions during 2015	6,000,000
Maximum [Member] | Pension Plan [Member]
Defined Benefit Plan Disclosure [Line Items]
Estimated employer contributions during 2015	$ 8,000,000