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Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Jun. 30, 2019
Mar. 31, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Derivative [Line Items]            
Notional Amount $ 647,326     $ 647,326   $ 513,208
Asset, Fair Value 422     422   2,093
Liability, Fair Value (8,266)     (8,266)   (2,474)
Change in fair value of interest rate derivatives (1,933)   $ (11) (3,396) $ 958  
Unrealized cash flow hedge losses (3,459) $ (1,003) 0 (4,462) 0  
Total change in fair value of interest rate derivatives (5,392)   (11) (7,858) 958  
Interest rate swaps            
Derivative [Line Items]            
Notional Amount 247,326     247,326    
Total change in fair value of interest rate derivatives (4,549)   5 (6,201) 353  
Interest rate caps            
Derivative [Line Items]            
Total change in fair value of interest rate derivatives (843)   $ (16) (1,657) $ 605  
Not designated as accounting hedges            
Derivative [Line Items]            
Notional Amount 500,000     500,000   450,000
Asset, Fair Value 422     422   2,093
Liability, Fair Value (2,186)     (2,186)   (749)
Not designated as accounting hedges | Interest rate swaps            
Derivative [Line Items]            
Notional Amount 100,000     100,000   100,000
Asset, Fair Value 0     0   303
Liability, Fair Value (2,186)     (2,186)   (749)
Not designated as accounting hedges | Interest rate caps            
Derivative [Line Items]            
Notional Amount 400,000     400,000   350,000
Asset, Fair Value 422     422   1,790
Liability, Fair Value 0     0   0
Designated as accounting hedge | Interest rate swaps            
Derivative [Line Items]            
Notional Amount 147,326     147,326   63,208
Asset, Fair Value 0     0   0
Liability, Fair Value $ (6,080)     $ (6,080)   $ (1,725)