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Financial Instruments and Fair Values - Narrative (Details) - USD ($)
 3 Months Ended 9 Months Ended
Sep. 30, 2020
Sep. 30, 2019
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2019
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate swap agreements liability $ 10,222,000   $ 10,222,000   $ 13,330,000
Interest Rate Swap          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate swap agreements liability 10,300,000   10,300,000    
Designated as Hedging Instrument | Cash Flow Hedging          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Net loss to be reclassified into interest expense within the next 12 months     (11,500,000)    
Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Aggregate notional value 265,000,000.0   265,000,000.0   390,000,000.0
Net unrealized gain (loss) 2,900,000 $ (5,900,000) (13,400,000) $ (25,400,000)  
Accounts payable and accrued expenses | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Interest rate swap agreements liability 10,200,000   10,200,000   $ 13,300,000
LIBOR | Designated as Hedging Instrument | Cash Flow Hedging | Interest Rate Swap, Three Month LIBOR, 2.9580%          
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]          
Notional amount $ 125,000,000.0   125,000,000.0    
Payment of termination settlement fee     $ 20,300,000