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Notes Payable and Unsecured Credit Facilities (Tables) | 12 Months Ended
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Dec. 31, 2018
Debt Instrument [Line Items] |
Schedule of Debt [Table Text Block] | The Company’s outstanding debt consists of the following:
| Maturing Through | Weighted Average Contractual Rate | Weighted Average Effective Rate |  | December 31,
(in thousands) |  | 2018 |  | 2017
Notes payable: |  |  |  |  |  |  |
Fixed rate mortgage loans | 10/1/2036 | 4.8% | 4.3% |  | $ | 403,306 |  |  | 520,193 |
Variable rate mortgage loans (1) | 6/2/2027 | 3.5% | 3.7% |  | 127,850 |  |  | 125,866 |
Fixed rate unsecured public and private debt | 2/1/2047 | 4.0% | 4.4% |  | 2,475,322 |  |  | 2,325,656 |
Total notes payable |  |  |  |  | $ | 3,006,478 |  |  | 2,971,715 |
Unsecured credit facilities: |  |  |  |  |  |  |
Line of Credit (2) | 3/23/2022 | 3.4% | 3.5% |  | 145,000 |  |  | 60,000 |
Term Loans | 1/5/2022 | 2.4% | 2.5% |  | 563,734 |  |  | 563,262 |
Total unsecured credit facilities |  |  |  |  | $ | 708,734 |  |  | 623,262 |
Total debt outstanding |  |  |  |  | $ | 3,715,212 |  |  | 3,594,977 |
(1) Includes five mortgages, whose interest varies on LIBOR based formulas. Three of these variable rate loans have interest rate swaps in place to fix the interest rates at a range of 2.8% to 4.1%.
(2) Maturity is subject to two six month extensions as the Company's option. The weighted average contractual and effective interest rates for the Line are calculated based on a fully drawn Line balance.
Schedule of Maturities of Long-term Debt [Table Text Block] | Scheduled principal payments and maturities on notes payable and unsecured credit facilities were as follows:
(in thousands) | December 31, 2018
Scheduled Principal Payments and Maturities by Year: | Scheduled Principal Payments |  | Mortgage Loan Maturities |  | Unsecured Maturities (1) |  | Total
2019 | $ | 9,518 |  |  | 13,216 |  |  | — |  |  | 22,734 |
2020 | 11,287 |  |  | 78,580 |  |  | 300,000 |  |  | 389,867 |
2021 | 11,599 |  |  | 77,060 |  |  | 250,000 |  |  | 338,659 |
2022 | 11,798 |  |  | 5,848 |  |  | 710,000 |  |  | 727,646 |
2023 | 10,043 |  |  | 59,375 |  |  | — |  |  | 69,418 |
Beyond 5 Years | 27,013 |  |  | 209,845 |  |  | 1,950,000 |  |  | 2,186,858 |
Unamortized debt premium/(discount) and issuance costs | — |  |  | 5,974 |  |  | (25,944 | ) |  | (19,970 | )
Total notes payable | $ | 81,258 |  |  | 449,898 |  |  | 3,184,056 |  |  | 3,715,212 |
(1) Includes unsecured public and private debt and unsecured credit facilities.
The Company has $13.2 million of debt maturing over the next twelve months, which is in the form of a non-recourse mortgage loan.

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- Definition Tabular disclosure of information pertaining to short-term and long-debt instruments or arrangements, including but not limited to identification of terms, features, collateral requirements and other information necessary to a fair presentation. + References No definition available. + Details
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- Definition Tabular disclosure of the combined aggregate amount of maturities and sinking fund requirements for all long-term borrowings for each of the five years following the date of the latest balance sheet date presented. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 470 -SubTopic 10 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6802200&loc=d3e1835-112601 + Details
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