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Goodwill and Intangible Assets (Narrative) (Details) - USD ($)
$ in Thousands
3 Months Ended 6 Months Ended
Feb. 09, 2021
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Finite-Lived Intangible Assets [Line Items]          
Amortization expense   $ 48,000 $ 35,600 $ 96,500 $ 74,400
Estimated future amortization for the remainder of fiscal year   93,300   93,300  
Estimated future amortization expense in year one   146,600   146,600  
Estimated future amortization expense in year two   125,900   125,900  
Estimated future amortization expense in year three   79,300   79,300  
Estimated future amortization expense in year four   74,200   74,200  
Estimated future amortization expense thereafter   138,000   138,000  
Gain on sale of businesses $ 2,800 $ 823 $ 0 $ 2,802 $ 0
Minimum          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life       1 year  
Maximum          
Finite-Lived Intangible Assets [Line Items]          
Finite-lived intangible asset, useful life       20 years