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Operating Property (Narrative) (Details) (USD $)
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Operating Property [Abstract]      
Depreciation $ 14,400,000us-gaap_Depreciation $ 14,000,000us-gaap_Depreciation $ 14,900,000us-gaap_Depreciation
Property impairment $ 0us-gaap_ImpairmentOfRealEstate $ 0us-gaap_ImpairmentOfRealEstate