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DEBT - Narrative (Details)
12 Months Ended
Dec. 28, 2017
USD ($)
Dec. 11, 2017
USD ($)
Sep. 30, 2017
USD ($)
Sep. 26, 2017
USD ($)
Apr. 21, 2015
USD ($)
Dec. 31, 2017
USD ($)
Property
Oct. 02, 2017
USD ($)
Jun. 30, 2017
USD ($)
Dec. 31, 2016
USD ($)
Jan. 15, 2016
USD ($)
Apr. 07, 2015
USD ($)
Sep. 05, 2013
USD ($)
Debt Instrument [Line Items]                        
Weighted average interest rate for all borrowings           3.89%     3.69%      
Debt instrument, collateral, number of real estate properties | Property           50            
Unsecured debt | Senior unsecured credit facility $450 Million                        
Debt Instrument [Line Items]                        
Loan amount           $ 450,000,000.0     $ 450,000,000      
Maximum borrowing capacity           450,000,000.0       $ 450,000,000.0    
Line of credit outstanding           165,000,000.0            
Amount available for borrowing           285,000,000.0            
Maximum increase in borrowing capacity available through accordion feature option           $ 150,000,000.0            
Unsecured debt | Senior unsecured credit facility $300 Million                        
Debt Instrument [Line Items]                        
Maximum borrowing capacity                 300,000,000.0      
Unsecured debt | Term Loan $150 Million                        
Debt Instrument [Line Items]                        
Loan amount                   150,000,000.0    
Fixed interest rate           3.40%            
Unsecured debt | 2015 Term Loan                        
Debt Instrument [Line Items]                        
Loan amount                     $ 125,000,000.0  
Amount drawn         $ 15,000,000              
Maximum increase in borrowing capacity available through accordion feature option                     $ 75,000,000  
Accordion feature increase to total commitment         $ 15,000,000              
Effective interest rate           3.51%            
Unsecured debt | 2017 Term Loan                        
Debt Instrument [Line Items]                        
Loan amount   $ 225,000,000.0   $ 225,000,000.0                
Amount drawn   $ 100,000,000   125,000,000                
Maximum increase in borrowing capacity available through accordion feature option       $ 175,000,000.0                
Effective interest rate           3.11%            
Unsecured debt | Revolving credit facility $300 Million                        
Debt Instrument [Line Items]                        
Loan amount                   $ 300,000,000    
Unsecured debt | Revolving credit facility $225 Million                        
Debt Instrument [Line Items]                        
Loan amount                 225,000,000      
Revolving credit facility                        
Debt Instrument [Line Items]                        
Effective interest rate           3.21%            
Revolving credit facility | Unsecured debt | Senior unsecured credit facility $300 Million                        
Debt Instrument [Line Items]                        
Fixed interest rate           3.21%            
Option One | Unsecured debt | 2017 Term Loan | LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       1.45%                
Option One | Unsecured debt | 2017 Term Loan | LIBOR | Maximum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       2.20%                
Option One | Revolving credit facility | LIBOR | Minimum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis           1.50%            
Option One | Revolving credit facility | LIBOR | Maximum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis           2.25%            
Option Two | Unsecured debt | 2017 Term Loan | LIBOR                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       1.00%                
Option Two | Unsecured debt | 2017 Term Loan | Base Rate | Minimum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       0.45%                
Option Two | Unsecured debt | 2017 Term Loan | Base Rate | Maximum                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       1.20%                
Option Two | Unsecured debt | 2017 Term Loan | Federal funds rate                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis       0.50%                
Option Two | Revolving credit facility | Minimum                        
Debt Instrument [Line Items]                        
Debt instrument, base rate margin           0.50%            
Option Two | Revolving credit facility | Maximum                        
Debt Instrument [Line Items]                        
Debt instrument, base rate margin           1.25%            
Option Two | Revolving credit facility | LIBOR                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis           1.00%            
Option Two | Revolving credit facility | Federal funds rate                        
Debt Instrument [Line Items]                        
Interest rate margin on variable rate basis           0.50%            
Interest rate swaps                        
Debt Instrument [Line Items]                        
Notional value of derivative             $ 100,000,000          
Interest rate swaps | Designated as hedges                        
Debt Instrument [Line Items]                        
Notional value of derivative           $ 275,000,000     $ 75,000,000      
Cash flow hedges | Interest rate swaps | Designated as hedges                        
Debt Instrument [Line Items]                        
Notional value of derivative                       $ 75,000,000.0
Fixed interest rate           2.04%            
MetaBank | Secured debt | Non-recourse loan                        
Debt Instrument [Line Items]                        
Loan amount               $ 47,600,000.0        
Fixed interest rate           4.44%            
Amount drawn from secured debt $ 22,600,000   $ 25,000,000                  
Debt interest only payments term           18 months            
Loan amortization period after interest only payments period           25 years