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Real Estate (Tenant Reimbursements) (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Real Estate [Abstract]      
Tenant reimbursements $ 30.0us-gaap_TenantReimbursements $ 31.8us-gaap_TenantReimbursements $ 30.9us-gaap_TenantReimbursements