Annual report pursuant to Section 13 and 15(d)

Schedule III - Reconciliation of Real Estate Property (Details)

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Schedule III - Reconciliation of Real Estate Property (Details) (USD $)
In Thousands, unless otherwise specified
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Reconciliation of Carrying Amount of Real Estate Investments [Roll Forward]      
Balance, beginning of year $ 1,947,352 $ 1,916,045 $ 1,576,214
Acquisitions 255,107 0 304,572
Improvements 50,283 34,633 42,161
Dispositions and assets held for sale (2,923) (3,326) (6,902)
Balance, end of year $ 2,249,819 $ 1,947,352 $ 1,916,045