XML 58 R45.htm IDEA: XBRL DOCUMENT v3.10.0.1
Debt - Unsecured Revolving Credit and Term Loan Facility (Details)
 1 Months Ended 12 Months Ended
Aug. 31, 2017
USD ($)
option
Dec. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Line of Credit Facility [Line Items]        
Loss on early extinguishment of debt   $ 0 $ 2,157,000 $ 552,000
Unsecured facility   0 0  
Unsecured revolving credit facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Loss on early extinguishment of debt     2,200,000  
Current borrowing capacity $ 1,100,000,000.0      
Unsecured facility   0 0  
Option to extend maturity, number | option 2      
Extension period 6 months      
Maximum leverage ratio 60.00%      
Maximum consolidated secured indebtedness to asset value 40.00%      
Minimum tangible net worth $ 1,200,000,000.0      
Tangible net worth, minimum percent of net equity proceeds received 75.00%      
Minimum adjusted EBITDA to consolidated fixed charges 1.50      
Minimum net operating income to unsecured debt 1.75      
Maximum ratio of unsecured debt to unencumbered asset value 60.00%      
Unsecured Revolving Credit Facility And Term Loan | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Maximum borrowing capacity $ 1,365,000,000.000      
Unsecured revolving credit facility higher borrowing capacity option 1,750,000,000.00      
Term Loan | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Current borrowing capacity 265,000,000      
Unsecured facility $ 265,000,000 $ 265,000,000 $ 265,000,000  
Minimum | Unsecured revolving credit facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Extension fee percent of outstanding commitments under revolving credit facility 0.0625%      
Maximum | Unsecured revolving credit facility | Revolving Credit Facility        
Line of Credit Facility [Line Items]        
Extension fee percent of outstanding commitments under revolving credit facility 0.075%