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Significant Credit and Revenue Concentration - Narrative (Details)
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3 Months Ended | 12 Months Ended | |
|---|---|---|---|
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Mar. 31, 2015
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Mar. 31, 2014
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Dec. 31, 2014
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|
| Revenue, Major Customer [Line Items] | |||
| Number of tenants | 474 | 454 | |
| Shopko | |||
| Revenue, Major Customer [Line Items] | |||
| Rental revenue in percentage of total revenue | 12.80% | 14.00% | |
| Rental revenue by combined properties operated by tenants | 12.30% | 13.10% | |
| Revenues | |||
| Revenue, Major Customer [Line Items] | |||
| Number of tenants | 0 | 0 | |
| Revenues | Minimum | |||
| Revenue, Major Customer [Line Items] | |||
| Rental revenue in percentage of total revenue | 5.00% | 5.00% | |