Fair Value Disclosures (Details) (USD $)	Mar. 31, 2013		Dec. 31, 2012
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	$ 8,008,000	[1]	$ 7,623,000	[2]
Prepaid Expenses and Other Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred compensation plan assets	400,000		800,000
Other Non-Current Assets [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Deferred compensation plan assets	7,600,000		7,100,000
Total Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	6,580,000		6,115,000
Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	2,023,000		1,972,000
Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	2,096,000		1,980,000
International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	1,099,000		917,000
Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	408,000		383,000
Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	571,000		509,000
Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	383,000		354,000
Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	1,428,000		1,508,000
Level 1 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	8,008,000	[1]	7,623,000	[2]
Level 1 [Member] | Total Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	6,580,000		6,115,000
Level 1 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	2,023,000		1,972,000
Level 1 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	2,096,000		1,980,000
Level 1 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	1,099,000		917,000
Level 1 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	408,000		383,000
Level 1 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	571,000		509,000
Level 1 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	383,000		354,000
Level 1 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	1,428,000		1,508,000
Level 2 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0	[1]	0	[2]
Level 2 [Member] | Total Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 2 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0	[1]	0	[2]
Level 3 [Member] | Total Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets			0
Level 3 [Member] | Bond Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | Large Cap Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | International Mutual Fund [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | Mid Cap Mutual Cap [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | Small Cap Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | Balanced Mutual Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	0		0
Level 3 [Member] | Money Market Funds [Member]
Fair Value, Concentration of Risk, Financial Statement Captions [Line Items]
Fair value of assets	$ 0		$ 0

[1] At March 31, 2013, $0.4 million and $7.6 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 sheet reflecting the non-qualified Deferred Compensation Plan assets.

[2] At December 31, 2012, $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 sheet reflecting the non-qualified Deferred Compensation Plan assets.