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Business Segment Information (Narrative) (Details) - USD ($)
3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Segment Reporting Information [Line Items]        
Revenues $ 489,057,000 $ 481,670,000 $ 958,176,000 $ 1,063,113,000
Intersegment        
Segment Reporting Information [Line Items]        
Revenues $ 0 $ 0 $ 0 $ 0