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Debt and Capital Markets (Schedule of Long-term Debt Instruments) (Details)
3 Months Ended 6 Months Ended
Jul. 07, 2017
USD ($)
Apr. 06, 2017
shares
Apr. 05, 2017
USD ($)
Jun. 30, 2017
USD ($)
loans
properties
shares
Jun. 30, 2016
USD ($)
Jun. 30, 2017
USD ($)
loans
properties
shares
Jun. 30, 2016
USD ($)
Jul. 03, 2017
USD ($)
properties
May 23, 2017
USD ($)
Dec. 31, 2016
shares
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount       $ 48,100,000            
Number Of Mortgage Notes Receivable | loans       6   6        
Number of Properties Securing Mortgage Note | properties       6   6        
Common Shares, shares issued | shares       76,393,409   76,393,409       66,263,487
Net proceeds from issuance of common shares           $ 68,352,000 $ 142,279,000      
Gain on Extinguishment of Debt       $ 977,000 $ 0 $ 977,000 $ 0      
direct share purchase plan [Member]                    
Debt Instrument [Line Items]                    
Common Shares, shares issued | shares       928,219   928,219        
Net proceeds from issuance of common shares           $ 67,900,000        
Subsequent Event [Member]                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount $ 24,900,000                  
Number Of Mortgage Notes Receivable               3    
Number of Properties Securing Mortgage Note | properties               3    
Common Stock [Member]                    
Debt Instrument [Line Items]                    
Stock Issued During Period, Shares, Acquisitions | shares   8,851,264       8,851,264        
Mortgage note, due July 6, 2017 [Member]                    
Debt Instrument [Line Items]                    
Extinguishment of Debt, Amount       $ 87,000,000            
Number of Properties Securing Mortgage Note | properties       11   11        
Gain on Extinguishment of Debt     $ 1,000,000              
Senior Unsecured Notes Payable, 4.50 Percent, Due June 1, 2027 [Member] | Unsecured Debt [Member]                    
Debt Instrument [Line Items]                    
Debt Instrument, Face Amount                 $ 450,000,000  
Long-term Debt, Percentage Bearing Fixed Interest, Percentage Rate       4.50%   4.50%        
Senior Unsecured Notes Payable, Percent of Principal Amount Issued       0.99393   0.99393        
Debt Covenant, Debt to Adjusted Total Assets Ratio, Maximum           0.6        
Debt Covenant, Secured Debt to Adjusted Total Assets Ratio, Maximum           0.4        
Debt Covenant, Debt Service Coverage Ratio, Minimum           1.5        
Debt Covenant, Total Unencumbered Assets to Outstanding Unsecured Debt Ratio, Minimum           150.00%