Quarterly report pursuant to Section 13 or 15(d)

Noncontrolling Interests In Subsidiaries (Narrative) (Details)

v3.8.0.1
Noncontrolling Interests In Subsidiaries (Narrative) (Details)
$ in Millions
3 Months Ended
Mar. 31, 2018
USD ($)
property
shares
Dec. 31, 2017
Noncontrolling Interest [Line Items]    
Number of common shares received upon redemption of common units | shares 1  
Rebalance of ownership percentage | $ $ 0.6  
Percentage of noncontrolling interest 10.20% 10.40%
Participation Rights [Member]    
Noncontrolling Interest [Line Items]    
Number of properties 2  
Excess net cash flow remaining after the distribution to the Company 50.00%  
Internal rate of return 10.00%  
Future Developments [Member] | Participation Rights [Member]    
Noncontrolling Interest [Line Items]    
Number of properties 1