Fair Value Disclosure (Details) (USD $)	Dec. 31, 2012		Dec. 31, 2011
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	$ 7,623,000	[1]	$ 7,957,000	[2]
Bond [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,972,000		1,968,000
Large Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,980,000		1,463,000
International [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	917,000		1,053,000
Mid Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	383,000		915,000
Small Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	509,000		560,000
Balanced [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	354,000		234,000
Total Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	6,115,000		6,193,000
Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,508,000		1,764,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	7,623,000	[1]	7,957,000	[2]
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Bond [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,972,000		1,968,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Large Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,980,000		1,463,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | International [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	917,000		1,053,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Mid Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	383,000		915,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Small Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	509,000		560,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Balanced [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	354,000		234,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Total Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	6,115,000		6,193,000
Quoted Prices in Active Markets for Identical Assets (Level 1) [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	1,508,000		1,764,000
Significant Other Observable Inputs (Level 2) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0	[1]	0	[2]
Significant Other Observable Inputs (Level 2) [Member] | Bond [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Large Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | International [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Mid Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Small Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Balanced [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Total Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Other Observable Inputs (Level 2) [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0	[1]	0	[2]
Significant Unobservable Inputs (Level 3) [Member] | Bond [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Large Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | International [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Mid Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Small Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Balanced [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Total Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Significant Unobservable Inputs (Level 3) [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Assets, Fair Value Disclosure	0		0
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred Compensation Plan Assets	300,000		800,000
Other Non-Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred Compensation Plan Assets	$ 7,300,000		$ 7,100,000

[1] As of December 31, 2012, $0.3 million and $7.3 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.

[2] As of December 31, 2011, $0.8 million and $7.1 million are included in “Prepaid expenses and other current assets” (liability offset in “Other accrued expenses and other current liabilities”) and “Other non-current assets” (liability offset in “Deferred compensation”), respectively, in the consolidated balance sheets reflecting the non-qualified Deferred Compensation Plan assets.