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Derivatives and Hedging (Details) - USD ($)
 12 Months Ended
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Financial Instruments: Derivatives and Hedging      
Notional value $ 2,124,000,000 $ 1,674,000,000  
Interest rate swaps, net (69,050,000) 19,514,000  
Accumulated Other Comprehensive Income (Loss), Cumulative Changes in Net Gain (Loss) from Cash Flow Hedges, Effect Net of Tax 69,100,000 (19,500,000)  
Amount of hedge ineffectiveness 0 0  
Reclassification of unrealized gain on discontinued interest rate derivatives to interest expense   (2,250,000) $ 0
Interest Rate Cash Flow Hedge Gain (Loss) to be Reclassified During Next 12 Months, Net (27,700,000)    
Not Designated as Hedging Instrument      
Financial Instruments: Derivatives and Hedging      
Notional value 0 279,750,000  
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 0 (376,000)  
Not Designated as Hedging Instrument | Swap-cash flow 1      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.80%    
Notional value $ 0 30,195,000  
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 0 (34,000)  
Not Designated as Hedging Instrument | Swap-cash flow 2      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.80%    
Notional value $ 0 75,030,000  
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 0 (86,000)  
Not Designated as Hedging Instrument | Swap-cash flow 3      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.80%    
Notional value $ 0 32,025,000  
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 0 (37,000)  
Not Designated as Hedging Instrument | Swap-cash flow 4      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.81%    
Notional value $ 0 142,500,000  
Interest Rate Derivative Instruments Not Designated as Hedging Instruments, Liability at Fair Value $ 0 (219,000)  
Designated as Hedging Instrument | Swap-cash flow 13      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.15%    
Notional value $ 100,000,000 100,000,000  
Interest rate swaps, fair value, liabilities   607,000  
Interest rate swaps, fair value, assets $ (398,000)    
Designated as Hedging Instrument | Swap-cash flow 14      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.20%    
Notional value $ 100,000,000 100,000,000  
Interest rate swaps, fair value, liabilities   538,000  
Interest rate swaps, fair value, assets $ (418,000)    
Designated as Hedging Instrument | Swap-cash flow 15      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.15%    
Notional value $ 75,000,000 75,000,000  
Interest rate swaps, fair value, liabilities $ 594,000 590,000  
Designated as Hedging Instrument | Swap-cash flow 16      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.91%    
Notional value $ 75,000,000 75,000,000  
Interest rate swaps, fair value, liabilities $ 523,000 337,000  
Designated as Hedging Instrument | Swap-cash flow 17      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.61%    
Notional value $ 50,000,000 50,000,000  
Interest rate swaps, fair value, liabilities $ 433,000 32,000  
Designated as Hedging Instrument | Swap-cash flow 18      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.56%    
Notional value $ 50,000,000 50,000,000  
Interest rate swaps, fair value, liabilities   13,000  
Interest rate swaps, fair value, assets $ (416,000)    
Designated as Hedging Instrument | Swap-cash flow 19      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.71%    
Notional value $ 50,000,000 50,000,000  
Interest rate swaps, fair value, liabilities $ 462,000 109,000  
Designated as Hedging Instrument | Swap-cash flow 20      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.29%    
Notional value $ 200,000,000 200,000,000  
Interest rate swaps, fair value, liabilities $ 9,044,000 4,587,000  
Designated as Hedging Instrument | Swap-cash flow 24      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.29%    
Notional value $ 125,000,000 125,000,000  
Interest rate swaps, fair value, liabilities $ 5,648,000 2,859,000  
Designated as Hedging Instrument | Swap-cash flow 25      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.38%    
Notional value $ 200,000,000 200,000,000  
Interest rate swaps, fair value, liabilities $ 9,436,000 5,155,000  
Designated as Hedging Instrument | Swap-cash flow 26      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.38%    
Notional value $ 100,000,000 100,000,000  
Interest rate swaps, fair value, liabilities $ 4,716,000 2,574,000  
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Twenty Seven [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.75%    
Notional value $ 100,000,000 100,000,000  
Interest rate swaps, fair value, liabilities $ 7,635,000    
Interest rate swaps, fair value, assets   (3,590,000)  
Designated as Hedging Instrument | Swap-cash flow 21      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.51%    
Notional value $ 75,000,000 75,000,000  
Interest rate swaps, fair value, liabilities $ 5,284,000    
Interest rate swaps, fair value, assets   (2,120,000)  
Designated as Hedging Instrument | Swap-cash flow 22      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 2.39%    
Notional value $ 75,000,000 75,000,000  
Interest rate swaps, fair value, liabilities $ 5,012,000    
Interest rate swaps, fair value, assets   (1,858,000)  
Designated as Hedging Instrument | Swap-cash flow 23      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.35%    
Notional value $ 49,000,000 49,000,000  
Interest rate swaps, fair value, assets $ (454,000) (181,000)  
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Twenty Eight [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.28%    
Notional value $ 100,000,000 100,000,000  
Interest rate swaps, fair value, liabilities   690,000  
Interest rate swaps, fair value, assets $ (2,035,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Twenty Nine [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.24%    
Notional value $ 150,000,000 150,000,000  
Interest rate swaps, fair value, liabilities   2,268,000  
Interest rate swaps, fair value, assets $ (5,508,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.16%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,464,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty One [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.20%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,526,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Two [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.15%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,450,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Three [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 1.10%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,374,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Four [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.98%    
Notional value $ 25,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (596,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Five [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.95%    
Notional value $ 25,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (573,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Six [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.93%    
Notional value $ 25,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (558,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Seven [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.90%    
Notional value $ 25,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (535,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Eight [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.85%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,249,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Thirty Nine [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.75%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets $ (1,047,000)    
Designated as Hedging Instrument | Interest Rate, Swap Hedge, Type Forty [Member]      
Financial Instruments: Derivatives and Hedging      
Hedge interest rate 0.65%    
Notional value $ 50,000,000 0  
Interest rate swaps, fair value, liabilities   0  
Interest rate swaps, fair value, assets (662,000)    
Accounts Payable and Accrued Liabilities | Interest rate swap      
Financial Instruments: Derivatives and Hedging      
Interest rate swaps, fair value, liabilities 69,100,000 24,200,000  
Prepaid Expenses and Other Current Assets | Interest rate swap      
Financial Instruments: Derivatives and Hedging      
Interest rate swaps, fair value, assets   (4,300,000)  
Interest Expense      
Financial Instruments: Derivatives and Hedging      
Reclassification of unrealized gain on discontinued interest rate derivatives to interest expense $ (19,700,000) $ 5,400,000