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Accounting Policies Fair value of in place leases (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Tenant Origination Costs Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross $ 55,664 $ 56,327
Finite-Lived Intangible Assets, Accumulated Amortization 41,138 35,463
Finite-Lived Intangible Assets, Net 14,526 20,864
Leasing Commissions Absorption Costs Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 97,678 93,729
Finite-Lived Intangible Assets, Accumulated Amortization 75,014 60,289
Finite-Lived Intangible Assets, Net 22,664 33,440
Net Lease Intangible Assets Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 19,655 19,724
Finite-Lived Intangible Assets, Accumulated Amortization 12,434 9,495
Finite-Lived Intangible Assets, Net 7,221 10,229
Net Lease Intangible Liabilities Member    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-lived Intangible Liabilities, Net Lease, Gross 34,027 34,027
Finite-lived Intangible Liabilities, Net Lease, Accumulated Amortization 23,444 20,974
Finite-lived Intangible Liabilities, Net Lease, Net 10,583 13,053
Leases, Acquired-in-Place, Below-Market Ground Lease [Member]    
Acquired Finite-Lived Intangible Assets [Line Items]    
Finite-Lived Intangible Assets, Gross 12,080 12,080
Finite-Lived Intangible Assets, Accumulated Amortization 1,524 1,335
Finite-Lived Intangible Assets, Net $ 10,556 $ 10,745