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Financial Instruments and Fair Values - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative [Line Items]
Interest rate swap agreements liability	$ 13,330	$ 5,243
Loss from derivative financial instruments	0	0	$ 289
Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements liability	14,500
Designated as Hedging Instrument | Cash Flow Hedging
Derivative [Line Items]
Unrealized loss on valuation of interest rate swap agreements	20,600	900
Loss expected to be reclassified within twelve months	4,100
Loss from derivative financial instruments			$ 300
Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Notional amount	390,000	515,000
Prepaid expenses and other assets | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements asset		2,500
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest rate swaps
Derivative [Line Items]
Interest rate swap agreements liability	$ 13,300	$ 5,200

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The estimated net amount of existing gains or losses on cash flow hedges at the reporting date expected to be reclassified to earnings within the next 12 months.

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