Commitments, Contingencies And Guarantees (Narrative) (Details) (USD $)	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Payment Required Upon Termination Of Employment [Line Items]
Rent expense charged to operations	$ 15,400,000	$ 15,500,000	$ 14,300,000
Minimum royalty payments due through 2027	4,800,000
Commitments outstanding for additional purchase price payments	7,500,000
Purchase Obligation	14,900,000
Outstanding letters of credit to insurance company as security for workers' compensation claims	1,300,000
Period for continued vesting of outstanding equity awards upon termination of CEO without cause other than following a change in control, years	two years
Payment Required To CEO Upon Termination Of Employment Without Cause Other Than Following Change In Control [Member]
Payment Required Upon Termination Of Employment [Line Items]
Employee agreement contingencies	1,400,000
Payment Required To Officers Upon Termination Of Employment Following Change Of Control [Member]
Payment Required Upon Termination Of Employment [Line Items]
Employee agreement contingencies	20,700,000
Workers Compensation Insurance Policies [Member]
Payment Required Upon Termination Of Employment [Line Items]
Retained claim liability per incident	250,000
Loss contingency, range of possible loss, maximum	2,000,000	2,000,000	2,900,000
Self Insurance Reserve	1,200,000	700,000
Workers Compensation Insurance Policies [Member] | Cumulative Expense For Claims Incurred In 2012 [Member]
Payment Required Upon Termination Of Employment [Line Items]
General insurance expense	700,000
Workers Compensation Insurance Policies [Member] | Cumulative Expense For Claims Incurred In 2011 [Member]
Payment Required Upon Termination Of Employment [Line Items]
General insurance expense	400,000
Workers Compensation Insurance Policies [Member] | Cumulative Expense For Claims Incurred In 2010 [Member]
Payment Required Upon Termination Of Employment [Line Items]
General insurance expense	800,000
Employee Health Care Insurance Policy [Member]
Payment Required Upon Termination Of Employment [Line Items]
Retained claim liability per incident	300,000	275,000	250,000
General insurance expense	23,000,000	21,000,000	22,600,000
Self Insurance Reserve	$ 3,200,000	$ 3,900,000