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Intangible Leases and Goodwill Intangible Assets and Liabilities Amortization Expense (Details) - USD ($)
$ in Thousands
 12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 31,921 $ 27,604 $ 29,149
Amortization of intangible liabilities (7,133) (6,436) (6,640)
Management Contracts      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 2,900 0 0
Acquired In-place Leases      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets 30,966 28,812 29,970
Acquired Above-market Leases      
Acquired Finite-Lived Intangible Assets [Line Items]      
Amortization of intangible assets $ 5,188 $ 5,228 $ 5,819