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Derivative Instruments and Hedging Activities - Interest Rate Swap Agreements (Details) - USD ($)	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Jul. 31, 2019
Derivative [Line Items]
Unrealized gain (loss) on cash flow hedges	$ (8,362,000)	$ (2,674,000)
Interest rate swap agreements
Derivative [Line Items]
Notional amount	350,000,000		$ 350,000,000	$ 350,000,000
Unrealized gain (loss) on cash flow hedges	(14,732,000)	$ (2,674,000)
Cumulative net losses in AOCI	23,506,000
Other Long-Term Liabilities \| Interest rate swap agreements
Derivative [Line Items]
Derivative liability	$ 23,506,000		$ 8,774,000