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Derivative Instruments (Details) - USD ($)
12 Months Ended
Dec. 31, 2019
Nov. 22, 2019
Dec. 31, 2018
Derivative Instruments      
Derivative Asset $ 10,848,000   $ 13,923,000
Derivative Liability 36,087,000   10,966,000
Cash Collateral for Interest Rate Swap Contracts 12,200,000    
Total Notional Amount Forward Starting Interest Rate Swap $ 550,000,000.0    
Interest Rate Swap [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate During Period 2.02%    
Interest Rate Swaps Average Remaining Maturity 5 years 1 month 6 days    
Interest Rate Swap [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Derivative Asset $ 10,562,000   10,531,000
Derivative Liability 36,087,000   10,966,000
Net Notional Amount of Interest Rate Agreements 1,799,204,000    
Interest Rate Swap [Member] | Not Designated as Hedging Instrument [Member]      
Derivative Instruments      
Derivative Asset 286,000   3,392,000
Derivative Liability 0   $ 0
Interest Rate Swap, One [Member]      
Derivative Instruments      
Derivative, Funds Received   $ 3,900,000  
Derivative, Notional Amount   100,000,000.0  
Interest Rate Swap, Two [Member]      
Derivative Instruments      
Derivative, Funds Received   3,900,000  
Derivative, Notional Amount   100,000,000.0  
Interest Rate Swap, Three [Member]      
Derivative Instruments      
Derivative, Funds Received   14,500,000  
Derivative, Notional Amount   $ 190,000,000.0  
Interest Rate Swap, 1.84% Maturing on June 20, 2026 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 75,000,000.0    
Derivative, Fixed Interest Rate 1.84%    
Interest Rate Swap, 1.83% Maturing on June 20, 2026 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 75,000,000.0    
Derivative, Fixed Interest Rate 1.83%    
Interest Rate Swap, 1.57% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 200,000,000.0    
Derivative, Fixed Interest Rate 1.57%    
Interest Rate Swap, 1.55% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.55%    
Interest Rate Swap, 1.57% Maturing on November, 30,2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.57%    
Interest Rate Swap, 1.84% Maturing on April, 15, 2027 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount Forward Starting Interest Rate Swap $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.84%    
Interest Rate Swap, 1.83% Maturing on April, 15, 2027 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount Forward Starting Interest Rate Swap $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.83%    
Interest Rate Swap, 1.68% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount Forward Starting Interest Rate Swap $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.68%    
Interest Rate Swap, 1.74% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount Forward Starting Interest Rate Swap $ 100,000,000.0    
Derivative, Fixed Interest Rate 1.74%    
Interest Rate Swap, 1.72% Maturing on September 30, 2029 [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Net Notional Amount Forward Starting Interest Rate Swap $ 150,000,000.0    
Derivative, Fixed Interest Rate 1.72%    
Interest Rate Cap [Member]      
Derivative Instruments      
Net Notional Amount of Interest Rate Agreements $ 200,000,000.0    
Derivative, Cap Interest Rate 5.50%    
Interest Rate Swaps Average Remaining Maturity 2 years    
Interest Rate Cap [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Derivative, Notional Amount $ 200,000,000.0    
Forward Contracts [Member] | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Interest Rate Swaps Average Remaining Maturity 6 years 8 months 12 days    
Cash Flow Hedges | Designated as Hedging Instrument [Member]      
Derivative Instruments      
Unrealized gain on derivatives $ (1,906,000)    
Derivative, Gain (Loss) on Derivative, Net $ (3,621,000)