Indebtedness (Amortization and Maturity Schedule) (Details) $ in Thousands	Dec. 31, 2017 USD ($)
Debt Instrument [Line Items]
2017	$ 33,560
2018	56,547
2019	420,900
2020	426,452
2021	402,172
2022	302,281
2023	452,395
2024	402,503
2025	404,440
2027 and thereafter	19,800
Subtotal	2,921,050
Reconciling items	(11,505)
Total for consolidated balance sheet	$ 2,909,545
Weighted average interest rate	3.77%
Principal Amortization, Mortgages [Member]
Debt Instrument [Line Items]
2017	$ 6,565
2018	6,504
2019	3,539
2020	2,504
2021	2,172
2022	2,281
2023	2,395
2024	2,503
2025	2,494
2027 and thereafter	19,800
Subtotal	50,757
Reconciling items	4,982
Total for consolidated balance sheet	55,739
Principal Maturities, Mortgages [Member]
Debt Instrument [Line Items]
2017	26,995
2018	50,043
2019	67,361
2020	65,009
2021	0
2022	0
2023	0
2024	0
2025	1,946
2027 and thereafter	0
Subtotal	211,354
Reconciling items	0
Total for consolidated balance sheet	211,354
Unsecured Debt [Member]
Debt Instrument [Line Items]
2017	0
2018	0
2019	350,000
2020	0
2021	400,000
2022	300,000
2023	450,000
2024	400,000
2025	400,000
2027 and thereafter	0
Subtotal	2,300,000
Reconciling items	(16,487)
Total for consolidated balance sheet	2,283,513
Line of Credit [Member]
Debt Instrument [Line Items]
2017	0
2018	0
2019	0
2020	358,939
2021	0
2022	0
2023	0
2024	0
2025	0
2027 and thereafter	0
Subtotal	358,939
Reconciling items	0
Total for consolidated balance sheet	$ 358,939
Due in Next Twelve Months [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.20%
Due in Year Two [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.95%
Due in Year Three [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.66%
Due in Year Four [Member]
Debt Instrument [Line Items]
Weighted average interest rate	2.62%
Due in Year Five [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.13%
Due in Year Six [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.39%
Due in Year Seven [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.40%
Due in Year Eight [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.76%
Due in Year Nine [Member]
Debt Instrument [Line Items]
Weighted average interest rate	3.26%
Due After Year Nine [Member]
Debt Instrument [Line Items]
Weighted average interest rate	4.84%

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Amount of unamortized debt discount (premium) and debt issuance costs.

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