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Debt Obligations - Debt Information (Details)
1 Months Ended 12 Months Ended
Mar. 31, 2009
USD ($)
renerwal_option
Dec. 28, 2014
USD ($)
Nov. 30, 2010
USD ($)
Notes Due 2016 [Member]      
Debt Information      
Debt instrument, face amount     $ 225,000,000
Interest rate on debt     6.625%
Redemption of long-term debt   $ 18,400,000  
Option To Repurchase Headquarters Building 2019 [Member]      
Debt Information      
Sale leaseback transaction, sale price for the Condo Interest $ 225,000,000    
Proceeds from sale-leaseback financing $ 211,000,000    
Sale leaseback financing, lease term 15 years    
Sale leaseback financing, number of lease renewal options | renerwal_option 3    
Sale leaseback financing, lease renewal term 20 years    
Sale leaseback purchase option price $ 250,000,000    
Debt instrument, fee amount $ 39,000,000    
Sale leaseback financing, amortization period 10 years    
Debt instrument, interest rate, effective percentage 13.00%