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Debt (Narrative) (Details)
3 Months Ended
Mar. 31, 2023
USD ($)
Mar. 31, 2023
USD ($)
Mar. 31, 2022
USD ($)
Mar. 31, 2023
GBP (£)
Dec. 31, 2022
USD ($)
Debt Instrument [Line Items]          
Average borrowings outstanding   $ 735,000,000 $ 665,000,000    
Weighted average interest rate   5.80% 4.30%    
Interest Expense, Net   $ (13,090,000) $ (10,702,000)    
Interest expense   14,294,000 11,417,000    
5.75% Unsecured Notes maturing in 2026 [Member]          
Debt Instrument [Line Items]          
Unamortized debt issuance costs $ 2,300,000 $ 2,300,000     $ 2,500,000
Interest rate 5.75% 5.75%   5.75% 5.75%
Fair value of debt instrument $ 393,700,000 $ 393,700,000     $ 395,100,000
Five-Year Credit Agreement maturing in 2027 [Member]          
Debt Instrument [Line Items]          
Credit facility current borrowing capacity 300,000,000 300,000,000      
Line of credit facility outstanding 168,766,000 168,766,000     200,236,000
USD revolving credit facility borrowings [Member]          
Debt Instrument [Line Items]          
Line of credit facility outstanding 107,000,000 107,000,000      
GBP revolving credit facility borrowings [Member]          
Debt Instrument [Line Items]          
Line of credit facility outstanding | £       £ 50,000,000  
Commercial note with Truist Bank maturing in 2031 - $24.75 million [Member]          
Debt Instrument [Line Items]          
Unamortized debt issuance costs 100,000 100,000     100,000
Commercial note with Truist Bank maturing in 2032 - $27.2 million [Member]          
Debt Instrument [Line Items]          
Unamortized debt issuance costs $ 100,000 100,000     $ 100,000
Secured Overnight Financing Rates (SOFR) [Member] | USD revolving credit facility borrowings [Member]          
Debt Instrument [Line Items]          
Applicable interest rate margin 1.375%        
Prime Rate [Member] | USD revolving credit facility borrowings [Member]          
Debt Instrument [Line Items]          
Applicable interest rate margin 0.375%        
Sterling Overnight Interbank Average Rate (SONIA) [Member] | GBP revolving credit facility borrowings [Member]          
Debt Instrument [Line Items]          
Applicable interest rate margin 1.375%        
Securities Subject to Mandatory Redemption [Member] | Graham Healthcare Group [Member]          
Debt Instrument [Line Items]          
Interest expense   $ 1,500,000 $ 3,400,000