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Debt (York Property Mortgage) (Details) - USD ($)
12 Months Ended
Jul. 03, 2017
Jul. 01, 2017
Nov. 21, 2016
Jul. 01, 2015
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Jun. 21, 2017
Jun. 20, 2017
Jun. 30, 2015
Feb. 06, 2009
Debt [Line Items]                      
Annual prepayments         $ 39,667,000 $ 7,302,000 $ 223,440,000        
Equity         616,940,000 505,602,000          
Interest rate swap                      
Debt [Line Items]                      
Derivative contract term     2 years                
Minimum | York Property Mortgage                      
Debt [Line Items]                      
Debt instrument stated interest percentage                   5.60%  
Maximum | York Property Mortgage                      
Debt [Line Items]                      
Debt instrument stated interest percentage                   10.60%  
Mortgages                      
Debt [Line Items]                      
Annual prepayments $ 32,000,000                    
Mortgages | New Mortgage Loan                      
Debt [Line Items]                      
Debt term       7 years              
Principal amount       $ 325,000,000              
Net cash proceeds from debt       $ 98,000,000              
Derivative contract term       7 years              
Maximum Loan-To-Value ratio under agreement (as a percent)       65.00%              
Minimum debt yield under agreement (as a percent)       8.50%              
Restricted cash and cash equivalents         3,100,000 $ 4,600,000          
Minimum net worth under agreement         325,000,000            
Mortgages | New Mortgage Loan | Interest rate swap                      
Debt [Line Items]                      
Derivative contract term       2 years              
Mortgages | New Mortgage Loan | Collar                      
Debt [Line Items]                      
Derivative contract term       5 years              
Mortgages | New Mortgage Loan | LIBOR                      
Debt [Line Items]                      
Basis spread on variable rate (as a percent)       2.25%              
Mortgages | York Property Mortgage                      
Debt [Line Items]                      
Debt term   7 years                  
Amortization period       25 years              
Minimum net worth required for compliance               $ 325,000,000 $ 425,000,000    
Mortgages | York Property Mortgage | Interest rate swap                      
Debt [Line Items]                      
Derivative contract term       2 years              
Mortgages | Maximum                      
Debt [Line Items]                      
Annual prepayments 25,000,000                    
Assumption Of Existing Mortgage                      
Debt [Line Items]                      
Components of purchase price of land and buildings                     $ 235,000,000
Parent Company                      
Debt [Line Items]                      
Equity         $ 616,900,000            
Cash | Mortgages                      
Debt [Line Items]                      
Annual prepayments 25,000,000                    
Restricted Cash | Mortgages                      
Debt [Line Items]                      
Annual prepayments $ 7,000,000                    
Standard & Poor's, B Rating | Mortgages | York Property Mortgage                      
Debt [Line Items]                      
Required debt service         12 months            
Standard & Poor's, B Plus Rating | Mortgages | York Property Mortgage                      
Debt [Line Items]                      
Required debt service         6 months