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Debt (Revolving Credit Facility under the Senior Credit Agreement) (Narrative) (Details) - USD ($)
$ in Thousands
1 Months Ended 3 Months Ended
May 06, 2021
Mar. 31, 2021
Mar. 31, 2020
Line of Credit Facility [Line Items]      
Repayments of revolving credit facility   $ 500,000 $ 505,000
Revolving Credit Facility [Member]      
Line of Credit Facility [Line Items]      
Borrowings on the revolving credit facility   710,000  
Repayments of revolving credit facility   500,000  
Line of credit facility, outstanding   $ 590,000  
Line of credit facility, commitment fee   0.20%  
Revolving credit facility, effective interest rate   1.59%  
Revolving Credit Facility [Member] | Subsequent Event [Member]      
Line of Credit Facility [Line Items]      
Repayments of revolving credit facility $ 95,000    
Line of credit facility, outstanding $ 495,000