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 |