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Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Sep. 30, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Derivative [Line Items]              
Notional Amount $ 596,988       $ 596,988   $ 513,208
Asset, Fair Value 122       122   2,093
Liability, Fair Value (9,620)       (9,620)   (2,474)
Change in fair value of interest rate derivatives (529)     $ 298 (3,926) $ 1,256  
Unrealized cash flow hedge losses (1,247) $ (3,459) $ (1,003) (130) (5,709) (130)  
Total change in fair value of interest rate derivatives (1,776)     168 (9,635) 1,126  
Interest rate swaps              
Derivative [Line Items]              
Notional Amount 246,988       246,988    
Total change in fair value of interest rate derivatives (1,477)     319 (7,679) 673  
Interest rate caps              
Derivative [Line Items]              
Total change in fair value of interest rate derivatives (299)     $ (151) (1,956) $ 453  
Not designated as accounting hedges              
Derivative [Line Items]              
Notional Amount 450,000       450,000   450,000
Asset, Fair Value 122       122   2,093
Liability, Fair Value (2,416)       (2,416)   (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 (2,416)       (2,416)   (749)
Not designated as accounting hedges | Interest rate caps              
Derivative [Line Items]              
Notional Amount 350,000       350,000   350,000
Asset, Fair Value 122       122   1,790
Liability, Fair Value 0       0   0
Designated as accounting hedge | Interest rate swaps              
Derivative [Line Items]              
Notional Amount 146,988       146,988   63,208
Asset, Fair Value 0       0   0
Liability, Fair Value $ (7,204)       $ (7,204)   $ (1,725)