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Risk Management and Derivatives (Risk Concentrations, Geography) (Details) (USD $)
In Thousands, unless otherwise specified
Dec. 31, 2013
Dec. 31, 2012
Investment [Line Items]    
Real Estate Investment Property, Accumulated Depreciation $ 424,453 $ 378,306
Financing receivable, allowance for credit losses, collectively evaluated for impairment $ 29,200 [1] $ 33,100 [1]
[1] The carrying value of these loans include unamortized discounts, premiums, deferred fees and costs aggregating to a net discount of $4.6 million and $3.8 million as of December 31, 2013 and 2012, respectively.