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Investment in Unconsolidated Joint Ventures (Details) (USD $)
In Thousands, unless otherwise specified
3 Months Ended 12 Months Ended
Mar. 31, 2014
item
property
Mar. 31, 2013
Dec. 31, 2013
item
property
Investment in Unconsolidated Joint Ventures      
Number of unconsolidated joint ventures 5   5
Number of properties owned and operated by each unconsolidated joint venture 1   1
Investment in unconsolidated joint ventures $ 4,916   $ 4,906
Equity in earnings of unconsolidated joint ventures $ 133 $ 334