Fair Value Measurements (Carrying Amounts and Fair Value of Assets) (Details) (Fair Value, Measurements, Recurring, Carrying (Reported) Amount, Fair Value Disclosure, USD $) In Thousands, unless otherwise specified	Dec. 31, 2013		Dec. 25, 2012
Fixed Income Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	$ 4,909	[1]	$ 4,344	[1]
Fixed Income Securities | Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	1,409	[1]	369	[1]
Fixed Income Securities | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,500	[1]	3,975	[1]
Fixed Income Securities | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Equity Securities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	9,015	[1]	5,833	[1]
Equity Securities | Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	5,778	[1]	3,144	[1]
Equity Securities | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,237	[1]	2,689	[1]
Equity Securities | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Money Market Funds
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	13,948	[2]	17,619	[2]
Money Market Funds | Fair Value, Inputs, Level 1
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[2]	0	[2]
Money Market Funds | Fair Value, Inputs, Level 2
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	13,948	[2]	17,619	[2]
Money Market Funds | Fair Value, Inputs, Level 3
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	$ 0	[2]	$ 0	[2]

[1] These investments relate to the Deferred Compensation Plan and the POWR Plan and are located in the other assets line item on the Consolidated Balance Sheets. The investments categorized as level 2 in the fair value hierarchy are valued by using available market information which includes quoted market prices for identical or similar assets in non-active markets.

[2] The money market fund is short-term in nature and is classified in cash and cash equivalents on the Consolidated Balance Sheets. It is valued at amortized cost which reflects the market-based fair value.