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Leases - Narrative (Details) - USD ($)
$ in Thousands
6 Months Ended
Jun. 30, 2019
Dec. 30, 2018
Real Estate [Line Items]    
Right-of-Use Asset $ 5,000  
Finance lease payments, undiscounted 7,000  
Finance lease, interest offset 100  
Present value of finance lease liabilities 6,900  
Accumulated depreciation and amortization $ 940,034 $ 911,845
Office Space Leased To Third Parties ( as a percent ) 39.00%  
Headquarters Redesign and Consolidation    
Real Estate [Line Items]    
Investment Building and Building Improvements $ 508,000  
Accumulated depreciation and amortization $ 195,000