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Revolving Credit Facility Narrative (Details) (USD $)
9 Months Ended
Sep. 30, 2013
Sep. 29, 2013
Debt Instrument [Line Items]    
Maximum borrowing capacity $ 205,000,000 $ 175,000,000
Line Of Credit Facility, Percent Of Tangible Net Worth Limit For Acquisition Investments 20.00% 10.00%
Line of Credit Facility, Capacity Available for Specific Purpose Other than for Trade Purchases 60,000,000  
Line of credit facility expiration date Feb. 28, 2015  
Amount outstanding 152,500,000  
Remaining borrowing capacity 52,500,000  
Unsecured credit facility interest rate 2.19%  
Proceeds from the unsecured credit facility $ 50,000,000  
30-day LIBOR [Member]
   
Debt Instrument [Line Items]    
Basis spread on variable rate 2.00%