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v3.20.2

Long-Term Debt- Additional Information (Details) $ in Thousands | 9 Months Ended
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Sep. 30, 2020 USD ($) Contract | Sep. 30, 2019 USD ($)
Debt Instrument [Line Items] |  |
Payments for (proceeds from) derivative instrument operating activities | $ 33,499 | $ 13,325
3.07% Due in 2050 [member] | Line of Credit [Member] |  |
Debt Instrument [Line Items] |  |
Line of credit facility, maximum borrowing capacity | 400,000 |
3.07% Due in 2050 [member] | First Mortgage [Member] |  |
Debt Instrument [Line Items] |  |
Secured debt | $ 165,000 |
Interest rate | 3.07% |
Maturity year | 2050 |
Number of interest rate swaps settled | Contract | 7 |
Settled derivative notional amount | $ 70,000 |
Repayments of debt | $ 52,000 |

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