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Debt (Narrative) (Details)
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
Jun. 29, 2020
GBP (£)
Dec. 02, 2019
USD ($)
Jan. 31, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
Sep. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Average borrowings outstanding         $ 515,100,000 $ 501,100,000 $ 512,800,000 $ 499,700,000  
Weighted average interest rate         5.00% 5.10% 5.10% 5.10%  
Interest Expense, Net         $ (6,357,000) $ (5,302,000) $ (19,307,000) $ (17,834,000)  
5.75% Unsecured Notes due June 1, 2026 [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Net $ 4,100,000       $ 4,100,000   $ 4,100,000   $ 4,600,000
Interest rate 5.75%       5.75%   5.75%   5.75%
Fair value of debt instrument $ 422,800,000       $ 422,800,000   $ 422,800,000   $ 427,700,000
Carrying value of debt instrument [1] 395,931,000       395,931,000   395,931,000   395,393,000
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Net                 100,000
Line of credit facility outstanding [2] $ 0       $ 0   $ 0   $ 78,650,000
Other Indebtedness [Member]                  
Debt Instrument [Line Items]                  
Interest rate                 2.00%
Other Indebtedness [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Interest rate 0.00%       0.00%   0.00%    
Other Indebtedness [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Interest rate 16.00%       16.00%   16.00%    
Pinnacle Bank Line Of Credit [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility outstanding $ 1,959,000       $ 1,959,000   $ 1,959,000   $ 0
Pinnacle Bank Term Loan [Member]                  
Debt Instrument [Line Items]                  
Loans Payable to Bank 10,837,000       10,837,000   10,837,000   11,203,000
Five-Year Credit Agreement dated May 30, 2018 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility outstanding 77,156,000       77,156,000   77,156,000   0
Commercial note with Truist Bank [Member]                  
Debt Instrument [Line Items]                  
Commercial note payable 26,000,000       26,000,000   26,000,000   $ 27,500,000
Automotive [Member] | Interest Rate Swap [Member]                  
Debt Instrument [Line Items]                  
Derivative, Notional Amount       $ 30,000,000          
Fixed interest rate of derivative       2.70%          
Total fixed interest rate of derivative       4.70%          
Derivative, Basis Spread on Variable Rate       2.00%          
Automotive [Member] | Commercial note with Truist Bank [Member]                  
Debt Instrument [Line Items]                  
Commercial note payable       $ 30,000,000          
Debt Instrument, Term       10 years          
Monthly installment payments       $ 250,000          
Automotive [Member] | Commercial note with Truist Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                  
Debt Instrument [Line Items]                  
Applicable interest rate margin       1.75%          
Automotive [Member] | Commercial note with Truist Bank [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                  
Debt Instrument [Line Items]                  
Applicable interest rate margin       2.00%          
Graham Healthcare Group [Member] | Pinnacle Bank Line Of Credit [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility outstanding $ 2,000,000.0       $ 2,000,000.0   $ 2,000,000.0    
Debt Instrument, Term     2 years            
Applicable interest rate margin 2.75%   2.75%            
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%            
Line of Credit Facility, Maximum Borrowing Capacity     $ 2,250,000            
Graham Healthcare Group [Member] | Pinnacle Bank Term Loan [Member]                  
Debt Instrument [Line Items]                  
Interest rate     4.35%            
Loans Payable to Bank     $ 11,250,000            
Debt Instrument, Term     5 years            
Education [Member] | Five-Year Credit Agreement dated May 30, 2018 [Member]                  
Debt Instrument [Line Items]                  
Proceeds from Lines of Credit | £   £ 60,000,000              
Education [Member] | Five-Year Credit Agreement dated May 30, 2018 [Member] | London Interbank Offered Rate (LIBOR) [Member]                  
Debt Instrument [Line Items]                  
Applicable interest rate margin 1.50%                
[1] The carrying value is net of $4.1 million and $4.6 million of unamortized debt issuance costs as of September 30, 2020 and December 31, 2019, respectively.
[2] The carrying value is net of $0.1 million of unamortized debt issuance costs as of December 31, 2019.