Significant Credit and Revenue Concentration - Narrative (Details) |
3 Months Ended | 9 Months Ended | 12 Months Ended | |
|---|---|---|---|---|
|
Sep. 30, 2015
Customer
tenant
|
Sep. 30, 2014 |
Sep. 30, 2015
Customer
tenant
|
Dec. 31, 2014
Customer
tenant
|
|
| Revenue, Major Customer [Line Items] | ||||
| Number of tenants | 435 | 435 | 454 | |
| Revenues | ||||
| Revenue, Major Customer [Line Items] | ||||
| Number of tenants | Customer | 0 | 0 | 0 | |
| Revenues | Minimum | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 5.00% | 5.00% | ||
| Shopko | Revenues | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 9.90% | 14.30% | ||
| Shopko | Total assets | Customer Concentration Risk | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 7.70% | 10.70% | ||
| Shopko | Real estate investment portfolio | Customer Concentration Risk | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 9.90% | 13.10% | ||