Fair Value Measurements (Carrying Amounts and Fair Value of Assets) (Details) (USD $)	Apr. 01, 2014		Dec. 31, 2013
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Deferred compensation plan	$ 800,000		$ 600,000
Cash and cash equivalents fair value disclosure	2,600,000		13,300,000
Equities
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	9,614,000	[1]	9,015,000
Equities | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	9,614,000	[1]	9,015,000	[1]
Equities | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	6,410,000	[1]	5,778,000	[1]
Equities | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,204,000	[1]	3,237,000	[1]
Equities | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Fixed income
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	5,275,000	[1]	4,909,000
Fixed income | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	5,275,000	[1]	4,909,000	[1]
Fixed income | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	1,504,000	[1]	1,409,000	[1]
Fixed income | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,771,000	[1]	3,500,000	[1]
Fixed income | Level 3 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[1]	0	[1]
Money market fund
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,403,000	[2]	13,948,000
Money market fund | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,403,000	[2]	13,948,000	[2]
Money market fund | Level 1 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	0	[2]	0	[2]
Money market fund | Level 2 Inputs | Fair Value, Measurements, Recurring
Fair Value, Balance Sheet Grouping, Financial Statement Captions [Line Items]
Investments, fair value disclosure	3,403,000	[2]	13,948,000	[2]
Money market fund | Level 3 Inputs | Fair Value, Measurements, Recurring
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] At April 1, 2014 and December 31, 2013, $0.8 million and $0.6 million, respectively, related to the Deferred Compensation and POWR Plans, were located in the other assets line item on the Consolidated Balance Sheets. At April 1, 2014 and December 31, 2013 the remaining $2.6 million and $13.3 million, respectively, were short-term in nature and were classified in cash and cash equivalents on the Consolidated Balance Sheets. Money market funds are valued at amortized cost which reflects the market-based fair value.