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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Details) - Interest Rate Swap Agreements - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019 | Jul. 31, 2019
Derivative [Line Items] |  |  |  |  |  |
Notional amount | $ 350,000,000 |  | $ 350,000,000 |  | $ 350,000,000 | $ 350,000,000
Unrealized (gains) losses associated with interest rate swap agreements | (1,185,000) | $ 3,468,000 | 14,445,000 | $ 11,073,000 |  |
Cumulative net losses in AOCI | 23,219,000 |  | 23,219,000 |  |  |
Other Long-Term Liabilities |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability | $ 23,219,000 |  | $ 23,219,000 |  | $ 8,774,000 |

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