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Goodwill and Other Intangible Asset - Carrying Amount of Goodwill (Details) - USD ($)
$ in Thousands
3 Months Ended
Mar. 31, 2019
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Line Items]        
Goodwill - gross carrying amount   $ 873,150 $ 724,252  
Accumulated impairment losses   (57,745) (57,745)  
Goodwill - net carrying amount   $ 815,405 $ 666,507 $ 339,023
Lugano        
Goodwill [Line Items]        
Impairment Assessment Assumptions Weighted Average Cost Of Capital 14.80%