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Debt - Interest Rate Swaps (Details)
$ in Thousands
12 Months Ended
Dec. 31, 2019
USD ($)
contract
outstanding_contract
Dec. 31, 2018
USD ($)
outstanding_contract
Derivative [Line Items]    
Number of contracts | outstanding_contract 180 142
Contract notional amount $ 2,004,858 $ 3,027,375
Interest rate swap    
Derivative [Line Items]    
Number of contracts | contract 4  
Contract notional amount $ 1,400,000  
Derivative, term of contract 30 days  
Interest rate derivative hedge, asset (liability), net $ (64,800) $ (10,700)
Interest rate swap | Minimum    
Derivative [Line Items]    
Derivative, fixed interest rate 2.13%  
Interest rate swap | Maximum    
Derivative [Line Items]    
Derivative, fixed interest rate 3.04%