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Notes Payable and Unsecured Credit Facilities Narrative (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Mar. 06, 2019
Debt Instrument [Line Items] |  |  |
Repayments of Secured Debt | $ 4,562 | $ 5,513 |
Repayments of Unsecured Debt | 250,000 | $ 150,000 |
Prepayment premium mortgage [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Secured Debt | 1,000 |  |
Prepayment premium unsecured debt [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of Secured Debt | $ 9,600 |  |
Senior Notes [Member] | Notes Due March 2049 [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Face Amount |  |  | $ 300,000
Debt Instrument, Interest Rate, Stated Percentage |  |  | 4.65%
Debt Instrument, Discount Percent |  |  | 99.661%
Notes Payable to Banks [Member] | 250M 4.8% Notes [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 4.80% |  |
Repayments of Unsecured Debt | $ 250,000 |  |
Mortgages [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Repayments of First Mortgage Bond | $ 52,700 |  |
Mortgages [Member] | Minimum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 6.25% |  |
Mortgages [Member] | Maximum [Member] |  |  |
Debt Instrument [Line Items] |  |  |
Debt Instrument, Interest Rate, Stated Percentage | 7.25% |  |

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