Defined Benefit Plans (Details) (USD $)			3 Months Ended		6 Months Ended		3 Months Ended		6 Months Ended
	Jun. 25, 2014	Dec. 25, 2013	Jun. 25, 2014 Pension Plan [Member]	Jun. 26, 2013 Pension Plan [Member]	Jun. 25, 2014 Pension Plan [Member]	Jun. 26, 2013 Pension Plan [Member]	Jun. 25, 2014 Other Defined Benefit Plans [Member]	Jun. 26, 2013 Other Defined Benefit Plans [Member]	Jun. 25, 2014 Other Defined Benefit Plans [Member]	Jun. 26, 2013 Other Defined Benefit Plans [Member]
Components of net periodic benefit cost [Abstract]
Service cost			$ 95,000	$ 100,000	$ 190,000	$ 200,000
Interest cost			771,000	734,000	1,550,000	1,488,000	31,000	28,000	62,000	56,000
Expected return on plan assets			(988,000)	(1,120,000)	(1,977,000)	(2,244,000)
Amortization of net loss			231,000	408,000	462,000	827,000	16,000	18,000	31,000	36,000
Settlement loss recognized							25,000	0	25,000	0
Net periodic benefit cost			109,000	122,000	225,000	271,000	72,000	46,000	118,000	92,000
Maximum contributions made to qualified pension plan and other defined benefit plans					1,300,000	2,800,000			200,000	100,000
Maximum expected additional contributions to be made to qualified pension plan and other defined benefit plans					1,300,000				200,000
Additional minimum pension liability	$ 18,400,000	$ 18,700,000