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Notes Payable and Unsecured Credit Facilities (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Debt Instrument [Line Items]
Long-term Debt	$ 3,715,212	$ 3,594,977
Line of Credit Facility, Interest Rate Description	LIBOR plus 0.875%
Debt Instrument, Interest Rate Terms	LIBOR plus 0.95%
Maturities of Long-term Debt [Abstract]
2017	$ 22,734
2018	389,867
2019	338,659
2020	727,646
2021	69,418
Beyond 5 Years	2,186,858
Unamortized debt discounts (premiums)	$ (19,970)
Line of Credit Facility, Commitment Fee Amount	0.15%
Accordion Feature [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Maximum Borrowing Capacity	$ 1,250,000
Contractual Rate [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.40%
Contractual Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	2.40%
Effective Rate [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.50%
Effective Rate [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	2.50%
Fixed Rate Mortgage Loans [Member] | Contractual Rate [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.80%
Fixed Rate Mortgage Loans [Member] | Effective Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.30%
Mortgages [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date	Oct. 01, 2036
Long-term Debt	$ 403,306	520,193
Mortgages [Member] | Scheduled Principal Payments [Member]
Debt Instrument [Line Items]
Long-term Debt	81,258
Maturities of Long-term Debt [Abstract]
2017	9,518
2018	11,287
2019	11,599
2020	11,798
2021	10,043
Beyond 5 Years	27,013
Unamortized debt discounts (premiums)	0
Mortgages [Member] | Mortgage Loan Maturities [Member]
Debt Instrument [Line Items]
Long-term Debt	449,898
Maturities of Long-term Debt [Abstract]
2017	13,216
2018	78,580
2019	77,060
2020	5,848
2021	59,375
Beyond 5 Years	209,845
Unamortized debt discounts (premiums)	$ 5,974
Mortgages [Member] | London Interbank Offered Rate (LIBOR) [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date	Jun. 02, 2027
Long-term Debt	$ 127,850	125,866
Variable Rate Mortgage Loans [Member] | Contractual Rate [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	3.50%
Variable Rate Mortgage Loans [Member] | Effective Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	3.70%
Notes Payable to Banks [Member]
Debt Instrument [Line Items]
Long-term Debt	$ 3,006,478	2,971,715
Unsecured Debt [Member]
Debt Instrument [Line Items]
Long-term Debt, Maturity Date	Feb. 01, 2047
Long-term Debt	$ 2,475,322	2,325,656
Long-term Line of Credit	708,734	623,262
Unsecured Debt [Member] | Unsecured Maturities [Member]
Debt Instrument [Line Items]
Long-term Debt	3,184,056
Maturities of Long-term Debt [Abstract]
2017	0
2018	300,000
2019	250,000
2020	710,000
2021	0
Beyond 5 Years	1,950,000
Unamortized debt discounts (premiums)	$ (25,944)
Unsecured Debt [Member] | Line of Credit [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date	Mar. 23, 2022
Long-term Line of Credit	$ 145,000	60,000
Unsecured Debt [Member] | Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Line of Credit Facility, Expiration Date	Jan. 05, 2022
Long-term Line of Credit	$ 563,734	$ 563,262
Unsecured Debt [Member] | Contractual Rate [Member]
Debt Instrument [Line Items]
Debt, Weighted Average Interest Rate	4.00%
Unsecured Debt [Member] | Effective Rate [Member]
Debt Instrument [Line Items]
Debt Instrument, Interest Rate, Effective Percentage	4.40%

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Effective interest rate for the funds borrowed under the debt agreement considering interest compounding and original issue discount or premium.

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Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

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Weighted average interest rate of debt outstanding.

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The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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