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Debt (Narrative) (Details)
£ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 29, 2020
GBP (£)
Dec. 02, 2019
USD ($)
Jan. 31, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Dec. 31, 2019
USD ($)
Debt Instrument [Line Items]                  
Average borrowings outstanding         $ 510,500,000 $ 507,700,000 $ 511,200,000 $ 499,800,000  
Weighted average interest rate         5.10% 5.10% 5.10% 5.10%  
Interest Expense, Net         $ (6,423,000) $ (6,807,000) $ (12,950,000) $ (12,532,000)  
5.75% Unsecured Notes due June 1, 2026 [Member]                  
Debt Instrument [Line Items]                  
Debt Issuance Costs, Net $ 4,200,000       $ 4,200,000   $ 4,200,000   $ 4,600,000
Interest rate 5.75%       5.75%   5.75%   5.75%
Fair value of debt instrument $ 416,800,000       $ 416,800,000   $ 416,800,000   $ 427,700,000
Carrying value of debt instrument [1] 395,751,000       395,751,000   395,751,000   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 $ 2,000,000       $ 2,000,000   $ 2,000,000   $ 0
Pinnacle Bank Term Loan [Member]                  
Debt Instrument [Line Items]                  
Loans Payable to Bank 10,969,000       10,969,000   10,969,000   11,203,000
Five-Year Credit Agreement dated May 30, 2018 [Member]                  
Debt Instrument [Line Items]                  
Line of credit facility outstanding 73,946,000       73,946,000   73,946,000   0
Commercial note with Truist Bank [Member]                  
Debt Instrument [Line Items]                  
Commercial note payable 26,500,000       26,500,000   26,500,000   $ 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 | £   £ 60.0              
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 $4.2 million and $4.6 million of unamortized debt issuance costs as of June 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.