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Debt - Narrative (Details)
3 Months Ended
Jun. 28, 2018
USD ($)
Apr. 27, 2018
USD ($)
property
entity
Oct. 22, 2015
USD ($)
entity
Mar. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]          
Weighted average interest rate (percent)       4.18%  
Number of wholly owned SPE | entity   4 6    
Number of properties owned by special purpose entities | property   4      
Outstanding pursuant on loan       $ 500,055,000 $ 490,055,000
Long-term debt       492,349,000 481,955,000
Mortgage Debt          
Debt Instrument [Line Items]          
Outstanding pursuant on loan       376,970,000 376,970,000
Term Loan | Notes Payable, Other Payables          
Debt Instrument [Line Items]          
Outstanding pursuant on loan       $ 123,000,000 113,000,000
Revolving credit facility | Line of Credit          
Debt Instrument [Line Items]          
Initial term of debt instrument       4 years  
Revolving credit facility, extension term       1 year  
Outstanding pursuant on loan       $ 85,000 85,000
BofA/KeyBank Loan | Mortgage Debt          
Debt Instrument [Line Items]          
Contractual interest rate       4.32%  
Outstanding pursuant on loan       $ 250,000,000 250,000,000
BofA/KeyBank Loan | Term Loan          
Debt Instrument [Line Items]          
Initial term of debt instrument   10 years      
Loan amount borrowed   $ 250,000,000      
Contractual interest rate   4.32%      
Prior notice period required   30 days      
Outstanding pursuant on loan       $ 250,000,000  
AIG Loan | Mortgage Debt          
Debt Instrument [Line Items]          
Duration monthly payments of interest only       5 years  
Contractual interest rate       4.15%  
Outstanding pursuant on loan       $ 126,970,000 $ 126,970,000
AIG Loan | Notes Payable, Other Payables          
Debt Instrument [Line Items]          
Duration monthly payments of interest only     5 years    
Initial term of debt instrument     10 years    
Contractual interest rate     4.15%    
Prior notice period required     30 days    
Long-term debt     $ 127,000,000    
Revolving Credit Facility | Revolving credit facility          
Debt Instrument [Line Items]          
Initial term of debt instrument 4 years        
Revolving credit facility, extension term 1 year        
Revolving credit facility current borrowing capacity $ 550,000,000        
Revolving credit facility, maximum borrowing capacity $ 1,250,000,000.00        
Remaining Borrowing Capacity       $ 214,400,000  
Proceeds used to pay down portion of credit facility   $ 249,800,000      
Number of wholly owned SPEs released from guarantor obligations | entity   4      
Revolving Credit Facility | Key Bank Term Loan          
Debt Instrument [Line Items]          
Initial term of debt instrument 5 years        
Revolving credit facility current borrowing capacity $ 200,000,000        
London Interbank Offered Rate (LIBOR)          
Debt Instrument [Line Items]          
LIBOR as of the balance sheet date (percent)       2.50%  
London Interbank Offered Rate (LIBOR) | Term Loan | Notes Payable, Other Payables          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       1.25%  
London Interbank Offered Rate (LIBOR) | Revolving credit facility | Line of Credit          
Debt Instrument [Line Items]          
Debt Instrument, Basis Spread on Variable Rate       1.30%