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Fair Value Measurements (Details) - USD ($)
$ in Thousands
Sep. 30, 2020
Dec. 31, 2019
Derivative [Line Items]    
Long-term Debt, Gross $ 1,153,642  
Fixed rate debt    
Derivative [Line Items]    
Long-term Debt, Gross 1,100,000 $ 783,300
Value of debt 1,300,000 817,700
Variable rate debt    
Derivative [Line Items]    
Value of debt $ 20,000 $ 89,000