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Accounting Policies Acquired finite-lived intangible assets (Details) $ in Thousands | Dec. 31, 2015 USD ($)
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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

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