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Debt, Commitments and Contingencies (Narrative) (Details) (USD $)
6 Months Ended
Jul. 01, 2011
May 06, 2011
Jul. 01, 2011
Floating Per Annum Rate [Member]
Maximum [Member]
Jul. 01, 2011
Floating Per Annum Rate [Member]
Minimum [Member]
Jul. 01, 2011
Reserve-Adjusted Fixed Per Annum Rate [Member]
Maximum [Member]
Jul. 01, 2011
Reserve-Adjusted Fixed Per Annum Rate [Member]
Minimum [Member]
Jul. 01, 2011
Maximum [Member]
Jul. 01, 2011
Minimum [Member]
Jul. 01, 2011
2011 Credit Facility [Member]
May 06, 2011
2011 Credit Facility [Member]
Jul. 01, 2011
Promissory Notes and Other [Member]
Dec. 31, 2010
Promissory Notes and Other [Member]
Unsecured revolving credit agreement, available borrowing capacity                   $ 1,100,000,000    
Unsecured revolving credit facility, additional borrowing capacity                   300,000,000    
Unsecured revolving credit facility, initiation date                 May 6, 2011      
Unsecured revolving credit facility, expiration date                 May 6, 2016      
Credit facility initial borrowing amount   151,000,000                    
Credit facility maximum borrowing amount                   700,000,000    
Credit facility term period, years                   5    
Term loan credit facility maximum borrowing amount                   400,000,000    
Term loan credit facility term period, years                   5    
Credit facility commitment fee, percentage             0.40% 0.20%        
Amortization of credit facility, percentage, year one                 5.00%      
Amortization of credit facility, percentage, year two                 5.00%      
Amortization of credit facility, percentage, year three                 10.00%      
Amortization of credit facility, percentage, year four                 10.00%      
Amortization of credit facility, percentage, year five                 70.00%      
Credit facility interest rate in addition to specific base rates     1.25% 0.25% 2.25% 1.25%            
Maximum leverage and minimum interest coverage ratio                 3.5      
Credit facility, amount outstanding 125,000,000                      
Debt Instrument, Face Amount                     2,300,000 2,200,000
Outstanding notes payable                     1,900,000  
Interest rate on notes                     6.00%  
Unconditional purchase obligations 66,600,000                      
Acquisition-related earn-outs as current liabilities 7,400,000                      
Acquisition-related holdbacks as non-current liabilities 7,900,000                      
Maximum remaining payments under business acquisition $ 26,300,000