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Accounting Policies Acquired finite-lived intangible assets (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Finite-Lived Intangible Assets [Line Items]  
2016 $ 194,033
2017 175,606
2018 150,901
2019 134,234
2020 115,195
Leases, Acquired-in-Place [Member]  
Finite-Lived Intangible Assets [Line Items]  
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months 12,574
Finite-Lived Intangible Assets, Amortization Expense, Year Two 8,860
Finite-Lived Intangible Assets, Amortization Expense, Year Three 6,078
Finite-Lived Intangible Assets, Amortization Expense, Year Four 3,572
Finite-Lived Intangible Assets, Amortization Expense, Year Five 2,349
2016 372
2017 (185)
2018 (668)
2019 (530)
2020 (321)
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue, Next Twelve Months 12,946
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue, Year Two 8,675
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue, Year Three 5,410
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue, Year Four 3,042
Finite-Lived Intangible Assets, Amortization Expense, Net of Revenue, Year Five $ 2,028