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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2021
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]              
Average borrowings outstanding   $ 545,900,000 $ 515,100,000 $ 531,300,000 $ 512,800,000    
Weighted average interest rate   4.80% 5.00% 4.90% 5.10%    
Interest Expense, Net   $ (9,422,000) $ (6,357,000) $ (22,457,000) $ (19,307,000)    
Interest expense   9,343,000 7,247,000 25,144,000 22,302,000    
Interest income   (79,000) $ 890,000 2,687,000 $ 2,995,000    
5.75% Unsecured Notes due June 1, 2026 [Member]              
Debt Instrument [Line Items]              
Unamortized debt issuance costs $ 3,400,000 $ 3,400,000   $ 3,400,000     $ 3,900,000
Interest rate 5.75% 5.75%   5.75%   5.75% 5.75%
Fair value of debt instrument $ 417,700,000 $ 417,700,000   $ 417,700,000     $ 421,700,000
Carrying value of debt instrument [1] 396,649,000 396,649,000   396,649,000     396,112,000
Five-Year Credit Agreement dated May 30, 2018 [Member]              
Debt Instrument [Line Items]              
Line of credit facility outstanding 122,251,000 122,251,000   122,251,000     74,686,000
USD $200 million portion of revolver [Member]              
Debt Instrument [Line Items]              
Line of credit facility outstanding 40,000,000 40,000,000   40,000,000      
Multicurrency $100 million portion of revolver [Member]              
Debt Instrument [Line Items]              
Line of credit facility outstanding | £           £ 61,000,000  
Commercial note with Truist Bank [Member]              
Debt Instrument [Line Items]              
Notes Payable to Bank 23,000,000 23,000,000   23,000,000     25,250,000
Pinnacle Bank Term Loan [Member]              
Debt Instrument [Line Items]              
Loans Payable to Bank 9,840,000 9,840,000   9,840,000     10,692,000
Pinnacle Bank Line Of Credit [Member]              
Debt Instrument [Line Items]              
Line of credit facility outstanding $ 0 $ 0   $ 0     $ 2,295,000
Minimum [Member] | Other Indebtedness [Member]              
Debt Instrument [Line Items]              
Interest rate 0.00% 0.00%   0.00%   0.00% 0.00%
Maximum [Member] | Other Indebtedness [Member]              
Debt Instrument [Line Items]              
Interest rate 16.00% 16.00%   16.00%   16.00% 16.00%
London Interbank Offered Rate (LIBOR) [Member] | Five-Year Credit Agreement dated May 30, 2018 [Member]              
Debt Instrument [Line Items]              
Applicable interest rate margin 1.50%            
Securities Subject to Mandatory Redemption [Member] | Graham Healthcare Group [Member]              
Debt Instrument [Line Items]              
Interest Expense, Net   $ (2,600,000)   $ (2,700,000)      
[1] The carrying value is net of $3.4 million and $3.9 million of unamortized debt issuance costs as of September 30, 2021 and December 31, 2020, respectively.