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Derivative Financial Instruments - Schedule of Derivatives (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Derivative [Line Items]      
Notional Amount $ 462,977   $ 513,208
Asset, Fair Value 1,152   2,093
Liability, Fair Value (3,927)   (2,474)
Change in fair value of interest rate derivatives (1,463) $ 969  
Unrealized cash flow hedge losses (1,003) 0  
Total change in fair value of interest rate derivatives (2,466) 969  
Interest rate swaps      
Derivative [Line Items]      
Total change in fair value of interest rate derivatives (1,652) 348  
Interest rate caps      
Derivative [Line Items]      
Total change in fair value of interest rate derivatives (814) $ 621  
Not designated as accounting hedges      
Derivative [Line Items]      
Notional Amount 400,000   450,000
Asset, Fair Value 1,152   2,093
Liability, Fair Value (1,271)   (749)
Not designated as accounting hedges | Interest rate swaps      
Derivative [Line Items]      
Notional Amount 100,000   100,000
Asset, Fair Value 175   303
Liability, Fair Value (1,271)   (749)
Not designated as accounting hedges | Interest rate caps      
Derivative [Line Items]      
Notional Amount 300,000   350,000
Asset, Fair Value 977   1,790
Liability, Fair Value 0   0
Designated as accounting hedge | Interest rate swaps      
Derivative [Line Items]      
Notional Amount 62,977   63,208
Asset, Fair Value 0   0
Liability, Fair Value $ (2,656)   $ (1,725)