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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Details) - USD ($) | 3 Months Ended | 9 Months Ended |  |
--- | --- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018 | Jul. 31, 2019 | Dec. 31, 2018
Derivative [Line Items] |  |  |  |  |  |
Unrealized gain (loss) on cash flow hedges | $ (1,496,000) | $ 1,980,000 | $ (9,101,000) | $ 4,183,000 |  |
Interest rate swap agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Notional amount | 350,000,000 |  | 350,000,000 |  | $ 350,000,000 | $ 350,000,000
Unrealized gain (loss) on cash flow hedges | (3,468,000) | $ 1,980,000 | (11,073,000) | $ 4,183,000 |  |
Cumulative net losses in AOCI | 12,046,000 |  | 12,046,000 |  |  |
Other Long-Term Liabilities | Interest rate swap agreements |  |  |  |  |  |
Derivative [Line Items] |  |  |  |  |  |
Derivative liability | $ 12,046,000 |  | $ 12,046,000 |  |  | $ 973,000

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