Employee Benefit Plans (Change in Benefit Obligation and Plan Assets) (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2014	Dec. 25, 2013	Dec. 26, 2012
Pension Plan [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	$ 64,391	$ 73,926
Service cost	380	400	380
Interest cost	3,099	2,977	3,200
Actuarial losses (gains)	12,313	(7,836)
Benefits paid	(5,975)	(5,076)
Settlements	0	0
Benefit obligation at end of year	74,208	64,391	73,926
Accumulated benefit obligation	74,208	64,391
Change in Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	61,094	58,006
Actual return on plan assets	5,201	5,364
Employer contributions	2,500	2,800
Benefits paid	(5,975)	(5,076)
Settlements	0	0
Fair value of plan assets at end of year	62,820	61,094	58,006
Funded status	(11,388)	(3,297)
Other Defined Benefit Plans [Member]
Change in Benefit Obligation [Roll Forward]
Benefit obligation at beginning of year	2,716	2,837
Service cost	0	0
Interest cost	123	111	116
Actuarial losses (gains)	298	(37)
Benefits paid	(195)	(195)
Settlements	(229)	0
Benefit obligation at end of year	2,713	2,716	2,837
Accumulated benefit obligation	2,713	2,716
Change in Plan Assets [Roll Forward]
Fair value of plan assets at beginning of year	0	0
Actual return on plan assets	0	0
Employer contributions	424	195
Benefits paid	(195)	(195)
Settlements	(229)	0
Fair value of plan assets at end of year	0	0	0
Funded status	$ (2,713)	$ (2,716)