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- Narrative (Details)
ft² in Thousands, $ in Thousands
1 Months Ended 9 Months Ended
Mar. 06, 2009
USD ($)
ft²
Sep. 29, 2019
USD ($)
Sep. 29, 2019
USD ($)
Dec. 30, 2018
USD ($)
Sale Leaseback Transaction [Line Items]        
Rentable square feet | ft² 750      
Amortization period     10 years  
Option To Repurchase Headquarters Building 2019        
Sale Leaseback Transaction [Line Items]        
Sale price for Condo Interest $ 225,000      
Principal amount   $ 245,339 $ 245,339 $ 250,000
Credit Facility        
Sale Leaseback Transaction [Line Items]        
Unsecured revolving credit facility, maximum borrowing capacity   $ 250,000 $ 250,000  
Unsecured revolving credit facility, term   5 years    
Unsecured revolving credit facility, unused commitment fee (quarterly)   0.20%