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Significant Credit and Revenue Concentration - Narrative (Details)
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12 Months Ended | 3 Months Ended | ||
|---|---|---|---|---|
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Dec. 31, 2014
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Dec. 31, 2013
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Dec. 31, 2014
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Dec. 31, 2013
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| Revenue, Major Customer [Line Items] | ||||
| Number of tenants | 454 | 377 | 454 | 377 |
| Sales [Member] | Customer Concentration Risk [Member] | ||||
| Revenue, Major Customer [Line Items] | ||||
| Number of tenants | 0 | 0 | 0 | 0 |
| Shopko and Pamida [Member] | Customer Concentration Risk [Member] | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue by combined properties operated by tenants | 13.10% | 14.40% | ||
| Shopko and Pamida [Member] | Sales [Member] | Customer Concentration Risk [Member] | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 14.00% | 14.80% | ||
| Minimum [Member] | Sales [Member] | Customer Concentration Risk [Member] | ||||
| Revenue, Major Customer [Line Items] | ||||
| Rental revenue in percentage of total revenue | 5.00% | 10.00% | ||