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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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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 + Details
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- Definition 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. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (b)(3) -URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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