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Operating Leases Operating Leases - Narrative (Details) - USD ($)
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net operating lease costs $ 49,862,000 $ 30,148,000
Costs related to variable lease payments 0 0
Right-of-use assets obtained in exchange for lease obligations 10,200,000 12,100,000
Impairment of long lived assets $ 15,400,000 $ 5,400,000
Weighted average remaining lease term 6 years 10 months 28 days 4 years 5 months 12 days
Weighted average discount rate (in percent) 2.51% 2.53%
Operating lease liabilities $ 49,949,000 $ 24,334,000
Operating Lease, Liability, Statement of Financial Position [Extensible List] Other Liabilities Other Liabilities
Other current liabilities    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Operating lease liabilities $ 49,900,000 $ 24,300,000
Selling, general and administrative    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net operating lease costs 47,500,000 27,600,000
Direct costs    
New Accounting Pronouncements or Change in Accounting Principle [Line Items]    
Net operating lease costs $ 2,400,000 $ 2,500,000