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Derivatives and Hedging Activities (Details) - USD ($)
 1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jun. 30, 2021
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2019
Dec. 31, 2020
Interest Rate Derivatives              
Notional value   $ 1,399,655,000   $ 1,399,655,000     $ 2,124,000,000
Interest Rate Cash Flow Hedge Derivative at Fair Value, Net   (35,208,000)   (35,208,000)     (69,050,000)
Unrealized gains (losses) included in accumulated other comprehensive loss       (35,200,000)     (69,100,000)
Amount of hedge ineffectiveness       0 $ 0 $ 0  
Reclassification of unrealized losses on discontinued cash flow hedges to other income (expense), net     $ 0 10,658,000 0    
Net unrealized gains in accumulated other comprehensive income expected to be reclassified into interest expense within the next 12 months   (20,200,000)   (20,200,000)      
Designated as Hedging Instrument | Interest Rate Swap, 1.15% [Member]              
Interest Rate Derivatives              
Notional value   0   0     100,000,000
Interest rate swap liability   $ 0   $ 0      
Interest Rate Cash Flow Hedge Asset at Fair Value             (398,000)
Interest rate   1.15%   1.15%      
Designated as Hedging Instrument | interest Rate Swap, 1.20%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     100,000,000
Interest rate swap liability   $ 0   $ 0      
Interest Rate Cash Flow Hedge Asset at Fair Value             (418,000)
Interest rate   1.20%   1.20%      
Designated as Hedging Instrument | Interest Rate Swap, 2.15%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     75,000,000
Interest rate swap liability   $ 0   $ 0     594,000
Interest rate   2.15%   2.15%      
Designated as Hedging Instrument | Interest Rate Swap 1.91%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     75,000,000
Interest rate swap liability   $ 0   $ 0     523,000
Interest rate   1.91%   1.91%      
Designated as Hedging Instrument | Interest Rate Swap, 1.61%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     50,000,000
Interest rate swap liability   $ 0   $ 0     433,000
Interest rate   1.61%   1.61%      
Designated as Hedging Instrument | Interest Rate Swap, 1.56%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     50,000,000
Interest rate swap liability   $ 0   $ 0      
Interest Rate Cash Flow Hedge Asset at Fair Value             (416,000)
Interest rate   1.56%   1.56%      
Designated as Hedging Instrument | Interest Rate Swap, 1.71%              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     50,000,000
Interest rate swap liability   $ 0   $ 0     462,000
Interest rate   1.71%   1.71%      
Designated as Hedging Instrument | Interest Rate Swap, 2.29% [Member]              
Interest Rate Derivatives              
Notional value   $ 200,000,000   $ 200,000,000     200,000,000
Interest rate swap liability   $ 5,732,000   $ 5,732,000     9,044,000
Interest rate   2.29%   2.29%      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax $ 2,800,000            
Derivative Liability, Notional Amount, Dedesignated Amount   $ 83,800,000   $ 83,800,000      
Designated as Hedging Instrument | Interest Rate Swap, 2.290% [Member]              
Interest Rate Derivatives              
Notional value   125,000,000   125,000,000     125,000,000
Interest rate swap liability   $ 3,579,000   $ 3,579,000     5,648,000
Interest rate   2.29%   2.29%      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax $ 1,600,000            
Derivative Liability, Notional Amount, Dedesignated Amount   $ 47,200,000   $ 47,200,000      
Designated as Hedging Instrument | Interest Rate Swap, 2.38% [Member]              
Interest Rate Derivatives              
Notional value   87,780,000   87,780,000     200,000,000
Interest rate swap liability   $ 2,626,000   $ 2,626,000     9,436,000
Interest rate   2.38%   2.38%      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax       $ 2,200,000      
Derivative Liability, Notional Amount, Terminated Amount   $ 112,200,000   112,200,000      
Designated as Hedging Instrument | Interest Rate Swap, 2.380% [Member]              
Interest Rate Derivatives              
Notional value   36,875,000   36,875,000     100,000,000
Interest rate swap liability   $ 1,103,000   $ 1,103,000     4,716,000
Interest rate   2.38%   2.38%      
Other Comprehensive Income (Loss), Cash Flow Hedge, Gain (Loss), after Reclassification and Tax       $ 4,000,000      
Derivative Liability, Notional Amount, Terminated Amount   $ 63,100,000   63,100,000      
Designated as Hedging Instrument | Interest Rate Swap, 2.75% [Member]              
Interest Rate Derivatives              
Notional value   100,000,000   100,000,000     100,000,000
Interest rate swap liability   $ 5,300,000   $ 5,300,000     7,635,000
Interest rate   2.75%   2.75%      
Designated as Hedging Instrument | Interest Rate Swap, 2.51% [Member]              
Interest Rate Derivatives              
Notional value   $ 75,000,000   $ 75,000,000     75,000,000
Interest rate swap liability   $ 3,768,000   $ 3,768,000     5,284,000
Interest rate   2.51%   2.51%      
Designated as Hedging Instrument | Interest Rate Swap, 2.39% [Member]              
Interest Rate Derivatives              
Notional value   $ 75,000,000   $ 75,000,000     75,000,000
Interest rate swap liability   $ 3,556,000   $ 3,556,000     5,012,000
Interest rate   2.39%   2.39%      
Designated as Hedging Instrument | Interest Rate Swap, 1.35% [Member]              
Interest Rate Derivatives              
Notional value   $ 0   $ 0     49,000,000
Interest rate swap liability   $ 0   $ 0      
Interest Rate Cash Flow Hedge Asset at Fair Value             (454,000)
Interest rate   1.35%   1.35%      
Designated as Hedging Instrument | Interest Rate Swap, 1.28% [Member]              
Interest Rate Derivatives              
Notional value   $ 100,000,000   $ 100,000,000     100,000,000
Interest rate swap liability   $ 1,181,000   $ 1,181,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (2,035,000)
Interest rate   1.28%   1.28%      
Designated as Hedging Instrument | Interest Rate Swap, 1.24% [Member]              
Interest Rate Derivatives              
Notional value   $ 150,000,000   $ 150,000,000     150,000,000
Interest rate swap liability   $ 2,952,000   $ 2,952,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (5,508,000)
Interest rate   1.24%   1.24%      
Designated as Hedging Instrument | Interest Rate Swap, 1.16% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 952,000   $ 952,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,464,000)
Interest rate   1.16%   1.16%      
Designated as Hedging Instrument | Interest Rate Swap, 1.200% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 1,007,000   $ 1,007,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,526,000)
Interest rate   1.20%   1.20%      
Designated as Hedging Instrument | Interest Rate Swap, 1.150% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 940,000   $ 940,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,450,000)
Interest rate   1.15%   1.15%      
Designated as Hedging Instrument | Interest Rate Swap, 1.10% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 873,000   $ 873,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,374,000)
Interest rate   1.10%   1.10%      
Designated as Hedging Instrument | Interest Rate Swap, 0.98% [Member]              
Interest Rate Derivatives              
Notional value   $ 25,000,000   $ 25,000,000     25,000,000
Interest rate swap liability   $ 356,000   $ 356,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (596,000)
Interest rate   0.98%   0.98%      
Designated as Hedging Instrument | Interest Rate Swap, 0.95% [Member]              
Interest Rate Derivatives              
Notional value   $ 25,000,000   $ 25,000,000     25,000,000
Interest rate swap liability   $ 336,000   $ 336,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (573,000)
Interest rate   0.95%   0.95%      
Designated as Hedging Instrument | Interest Rate Swap, 0.93% [Member]              
Interest Rate Derivatives              
Notional value   $ 25,000,000   $ 25,000,000     25,000,000
Interest rate swap liability   $ 323,000   $ 323,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (558,000)
Interest rate   0.93%   0.93%      
Designated as Hedging Instrument | Interest Rate Swap, 0.90% [Member]              
Interest Rate Derivatives              
Notional value   $ 25,000,000   $ 25,000,000     25,000,000
Interest rate swap liability   $ 303,000   $ 303,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (535,000)
Interest rate   0.90%   0.90%      
Designated as Hedging Instrument | Interest Rate Swap, 0.85% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 422,000   $ 422,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,249,000)
Interest rate   0.85%   0.85%      
Designated as Hedging Instrument | Interest Rate Swap, 0.75% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 257,000   $ 257,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (1,047,000)
Interest rate   0.75%   0.75%      
Designated as Hedging Instrument | Interest Rate Swap, 0.65% [Member]              
Interest Rate Derivatives              
Notional value   $ 50,000,000   $ 50,000,000     50,000,000
Interest rate swap liability   $ 358,000   $ 358,000      
Interest Rate Cash Flow Hedge Asset at Fair Value             (662,000)
Interest rate   0.65%   0.65%      
Interest Expense              
Interest Rate Derivatives              
Reclassification of unrealized losses on discontinued cash flow hedges to other income (expense), net   $ 5,000,000 $ 6,900,000 $ 18,900,000 $ 13,200,000    
Accounts payable and other liabilities | Interest rate swap              
Interest Rate Derivatives              
Interest rate swap liability   35,600,000   35,600,000     $ 69,100,000
Prepaid expenses and other assets | Interest rate swap              
Interest Rate Derivatives              
Interest Rate Cash Flow Hedge Asset at Fair Value   $ (400,000)   $ (400,000)