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Accounting Policies Amortization of leased assets acquired (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Finite-Lived Intangible Assets [Line Items]      
Deferred leasing costs amortization $ 5,983 $ 4,699 $ 4,279
Leases, Acquired-in-Place [Member]      
Finite-Lived Intangible Assets [Line Items]      
Deferred leasing costs amortization 22,244 19,854 17,923
Amortization of Intangible Assets Included in Revenue 538 456 (633)
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue $ 22,782 $ 20,310 $ 17,290