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Long-Term Debt, Borrowings and Payments under Bank Credit Facilities (Details) - USD ($)
$ in Thousands
9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Borrowings and Payments under the Revolving Credit Facility [Abstract]    
Borrowings (Payments) on bank credit facilities $ (248,057) $ 360,139
Revolving Credit Facility [Member]    
Borrowings and Payments under the Revolving Credit Facility [Abstract]    
Borrowings on bank credit facilities 4,795 582,212
Payments on bank credit facilities (252,852) (222,073)
Borrowings (Payments) on bank credit facilities $ (248,057) $ 360,139