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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 9 Months Ended 12 Months Ended
Jan. 31, 2019
Jun. 29, 2018
May 30, 2018
Jun. 30, 2018
Sep. 30, 2019
Jun. 30, 2019
Mar. 31, 2019
Dec. 31, 2018
Sep. 30, 2018
Jun. 30, 2018
Mar. 31, 2018
Sep. 30, 2019
Sep. 30, 2018
Dec. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]                              
Debt Extinguishment Costs         $ 0     $ 0 $ 0 $ (11,378,000) $ 0 $ 0 $ (11,378,000) $ (11,378,000) $ 0
Average borrowings outstanding         $ 501,100,000       $ 480,600,000     $ 499,700,000 $ 529,200,000    
Weighted average interest rate         5.10%       5.10%     5.10% 5.70%    
Interest Income (Expense), Net         $ (5,302,000) $ (6,807,000) $ (5,725,000) (5,062,000) $ (5,524,000) $ (15,264,000) $ (6,699,000) $ (17,834,000) $ (27,487,000) (32,549,000) $ (27,305,000)
Interest expense         6,776,000       $ 6,135,000     22,587,000 $ 31,371,000    
5.75% Unsecured Notes due June 1, 2026 [Member]                              
Debt Instrument [Line Items]                              
Debt Issuance Costs, Net         $ 4,800,000     $ 5,300,000       $ 4,800,000   $ 5,300,000  
Interest rate     5.75%   5.75%     5.75%       5.75%   5.75%  
Debt Instrument, Face Amount     $ 400,000,000                        
Fair value of debt instrument         $ 432,300,000     $ 406,700,000       $ 432,300,000   $ 406,700,000  
Carrying value of debt instrument [1]         395,212,000     394,675,000       395,212,000   394,675,000  
7.25% Unsecured Notes Due February 1, 2019 [Member]                              
Debt Instrument [Line Items]                              
Interest rate   7.25%                          
Redemption of Notes Outstanding   $ 400,000,000                          
Debt Extinguishment Costs   $ 11,400,000                          
Kaplan Four-Year Credit Agreement dated July 14, 2016 [Member]                              
Debt Instrument [Line Items]                              
Debt Issuance Costs, Net         100,000     200,000       100,000   200,000  
Line of credit facility outstanding [2]         $ 73,683,000     $ 82,366,000       $ 73,683,000   $ 82,366,000  
Other Indebtedness [Member]                              
Debt Instrument [Line Items]                              
Interest rate         2.00%     2.00%       2.00%   2.00%  
Five-Year Credit Agreement dated May 30, 2018 [Member]                              
Debt Instrument [Line Items]                              
Line of credit facility outstanding         $ 5,000,000     $ 0       $ 5,000,000   $ 0  
Line of Credit Facility, Interest Rate at Period End         5.50%             5.50%      
Debt Instrument, Term     5 years                        
Credit facility current borrowing capacity     $ 300,000,000                        
Debt covenant net leverage ratio, maximum     3.5                        
Debt covenant interest coverage ratio, minimum     3.5                        
Five-Year Credit Agreement dated May 30, 2018 [Member] | Minimum [Member]                              
Debt Instrument [Line Items]                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.15%                        
Five-Year Credit Agreement dated May 30, 2018 [Member] | Maximum [Member]                              
Debt Instrument [Line Items]                              
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage     0.25%                        
Five-Year Credit Agreement dated May 30, 2018 [Member] | Fed Funds Effective Rate Overnight Index Swap Rate [Member]                              
Debt Instrument [Line Items]                              
Applicable interest rate margin     0.50%                        
Five-Year Credit Agreement dated May 30, 2018 [Member] | Eurodollar [Member]                              
Debt Instrument [Line Items]                              
Applicable interest rate margin     1.00%                        
USD $200 million portion of revolver [Member]                              
Debt Instrument [Line Items]                              
Credit facility current borrowing capacity     $ 200,000,000                        
Multicurrency $100 million portion of revolver [Member]                              
Debt Instrument [Line Items]                              
Credit facility current borrowing capacity     $ 100,000,000                        
Commercial note [Member]                              
Debt Instrument [Line Items]                              
Commercial note payable         $ 28,250,000     $ 0       $ 28,250,000   $ 0  
Automotive [Member] | Interest Rate Swap [Member]                              
Debt Instrument [Line Items]                              
Applicable interest rate margin 2.00%                            
Derivative, Notional Amount $ 30,000,000                            
Fixed interest rate of derivative 2.70%                            
Total fixed interest rate of derivative 4.70%                            
Automotive [Member] | Commercial note [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 [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]                              
Debt Instrument [Line Items]                              
Applicable interest rate margin 1.75%                            
Automotive [Member] | Commercial note [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]                              
Debt Instrument [Line Items]                              
Applicable interest rate margin 2.00%                            
Graham Healthcare Group [Member]                              
Debt Instrument [Line Items]                              
Interest expense       $ 6,200,000                      
[1]
The carrying value is net of $4.8 million and $5.3 million of unamortized debt issuance costs as of September 30, 2019 and December 31, 2018, respectively.
[2]
The carrying value is net of $0.1 million and $0.2 million of unamortized debt issuance costs as of September 30, 2019 and December 31, 2018, respectively.