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Debt - York Property Mortgage Narrative (Details) - USD ($)
3 Months Ended
Jul. 03, 2017
Jul. 01, 2017
Nov. 21, 2016
Jul. 01, 2015
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Jun. 20, 2017
Debt [Line Items]                
Equity         $ 591,008,000 $ 490,380,000 $ 616,940,000  
Annual prepayments         2,015,000 1,932,000    
Interest rate swap                
Debt [Line Items]                
Derivative contract term     2 years          
Mortgages                
Debt [Line Items]                
Annual prepayments $ 32,000,000              
Mortgages | York Property Mortgage                
Debt [Line Items]                
Debt term   7 years   7 years        
Principal amount       $ 325,000,000        
Unsecured debt retired         $ 273,100,000      
Amortization period       25 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         $ 4,300,000 $ 6,100,000 $ 3,100,000  
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 | York Property Mortgage | LIBOR                
Debt [Line Items]                
Basis spread on variable rate (as a percent)       2.25%        
Mortgages | Maximum                
Debt [Line Items]                
Annual prepayments 25,000,000              
Parent Company                
Debt [Line Items]                
Equity         $ 591,000,000      
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      
Cash | Mortgages                
Debt [Line Items]                
Annual prepayments 25,000,000              
Restricted Cash | Mortgages                
Debt [Line Items]                
Annual prepayments $ 7,000,000