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Indebtedness - Amortization and Maturity Schedule (Details)
$ in Thousands
Dec. 31, 2015
USD ($)
Debt Instrument [Line Items]  
2016 $ 326,398
2017 307,580
2018 392,572
2019 56,709
2020 420,721
2021 67,417
2022 402,172
2023 302,281
2024 452,385
2025 and thereafter 426,752
Debt Instrument, Face Amount 3,154,987
Debt, reconciling items to carrying amount (7,971)
Long-term Debt, Maturities Total $ 3,147,016
Long-term Debt, Weighted Average Interest Rate 4.42%
Principal Amortization, Mortgages [Member]  
Debt Instrument [Line Items]  
2016 $ 9,518
2017 8,688
2018 6,470
2019 6,666
2020 3,351
2021 2,326
2022 2,172
2023 2,281
2024 2,385
2025 and thereafter 24,806
Debt Instrument, Face Amount 68,663
Debt, reconciling items to carrying amount 8,464
Long-term Debt, Maturities Total 77,127
Principal Maturities, Mortgages [Member]  
Debt Instrument [Line Items]  
2016 16,880
2017 2,349
2018 27,102
2019 50,043
2020 67,370
2021 65,091
2022 0
2023 0
2024 0
2025 and thereafter 1,946
Debt Instrument, Face Amount 230,781
Debt, reconciling items to carrying amount 0
Long-term Debt, Maturities Total 230,781
Unsecured Debt [Member]  
Debt Instrument [Line Items]  
2016 300,000
2017 296,543
2018 100,000
2019 0
2020 350,000
2021 0
2022 400,000
2023 300,000
2024 450,000
2025 and thereafter 400,000
Debt Instrument, Face Amount 2,596,543
Debt, reconciling items to carrying amount (16,435)
Long-term Debt, Maturities Total 2,580,108
Line of Credit [Member]  
Debt Instrument [Line Items]  
2016 0
2017 0
2018 259,000
2019 0
2020 0
2021 0
2022 0
2023 0
2024 0
2025 and thereafter 0
Debt Instrument, Face Amount 259,000
Debt, reconciling items to carrying amount 0
Long-term Debt, Maturities Total $ 259,000
Due in Next Twelve Months [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 5.53%
Due in Year Two [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 6.57%
Due in Year Three [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 3.26%
Due in Year Four [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 4.00%
Due in Year Five [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 4.82%
Due in Year Six [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 4.06%
Due in Year Seven [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 4.13%
Due in Year Eight [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 3.39%
Due in Year Nine [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 4.40%
Due After Year Nine [Member]  
Debt Instrument [Line Items]  
Long-term Debt, Weighted Average Interest Rate 3.81%