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Debt (Narrative) (Details)
$ in Thousands
3 Months Ended
Mar. 31, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2021
GBP (£)
Dec. 31, 2020
USD ($)
Debt Instrument [Line Items]          
Average borrowings outstanding   $ 512,100 $ 511,400    
Weighted average interest rate   5.00% 5.10%    
Interest Expense, Net   $ (7,558) $ (6,527)    
Interest expense   8,448 $ 7,678    
5.75% Unsecured Notes due June 1, 2026 [Member]          
Debt Instrument [Line Items]          
Unamortized debt issuance costs $ 3,700 $ 3,700     $ 3,900
Interest rate 5.75% 5.75%   5.75% 5.75%
Fair value of debt instrument $ 418,400 $ 418,400     $ 421,700
Carrying value of debt instrument [1] 396,289 396,289     396,112
Five-Year Credit Agreement dated May 30, 2018 [Member]          
Debt Instrument [Line Items]          
Line of credit facility outstanding 75,621 75,621   £ 55,000,000 74,686
Commercial note with Truist Bank [Member]          
Debt Instrument [Line Items]          
Notes Payable to Bank 24,500 24,500     25,250
Pinnacle Bank Term Loan [Member]          
Debt Instrument [Line Items]          
Loans Payable to Bank 10,411 10,411     10,692
Pinnacle Bank Line Of Credit [Member]          
Debt Instrument [Line Items]          
Line of credit facility outstanding $ 73 $ 73     $ 2,295
Minimum [Member] | Other Indebtedness [Member]          
Debt Instrument [Line Items]          
Interest rate 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%
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   $ 1,100      
[1] The carrying value is net of $3.7 million and $3.9 million of unamortized debt issuance costs as of March 31, 2021 and December 31, 2020, respectively.