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Goodwill and Other Intangible Assets (Goodwill) (Details) - USD ($)
$ in Thousands
3 Months Ended 9 Months Ended
Sep. 30, 2021
Sep. 30, 2020
Sep. 30, 2021
Sep. 30, 2020
Goodwill [Roll Forward]        
Balance at beginning of period $ 452,390 $ 497,267 $ 452,390 $ 497,267
Goodwill impairment 0 (44,877) 0 (44,877)
Balance at end of period $ 452,390 $ 452,390 $ 452,390 $ 452,390