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Debt (Narrative) (Details)
3 Months Ended 12 Months Ended
Jan. 31, 2019
USD ($)
Jun. 29, 2018
USD ($)
May 30, 2018
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Debt Instrument [Line Items]            
Average borrowings outstanding       $ 494,400,000 $ 496,500,000  
Weighted average interest rate of borrowings       5.10% 6.20%  
Interest Income (Expense), Net       $ (5,725,000) $ (6,699,000)  
5.75% Unsecured Notes due June 1, 2026 [Member]            
Debt Instrument [Line Items]            
Debt Issuance Costs, Net       5,100,000   $ 5,300,000
Interest rate     5.75%      
Debt Instrument, Face Amount     $ 400,000,000      
Fair value of debt instrument       421,000,000   406,700,000
Carrying value of debt instrument [1]       394,852,000   $ 394,675,000
Seven Point Two Five Percent Unsecured Notes Due February One Two Thousand And Nineteen [Member]            
Debt Instrument [Line Items]            
Interest rate   7.25%       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       $ 200,000   $ 200,000
Other Indebtedness [Member]            
Debt Instrument [Line Items]            
Interest rate       2.00%   2.00%
Maturity year       Dec. 31, 2026   Dec. 31, 2026
Five-Year Credit Agreement dated May 30, 2018 [Member]            
Debt Instrument [Line Items]            
Credit facility current borrowing capacity     $ 300,000,000      
Debt covenant net leverage ratio, maximum     3.5      
Debt covenant interest coverage ratio, minimum     3.5      
Debt Instrument, Term     5 years      
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] | Federal Funds Effective 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       $ 29,750,000   $ 0
Automotive [Member] | Interest Rate Swap [Member]            
Debt Instrument [Line Items]            
Applicable interest rate margin 2.00%          
Notional amount of derivative $ 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          
Monthly installment payments $ 250,000          
Debt Instrument, Term 10 years          
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%          
[1] The carrying value is net of $5.1 million and $5.3 million of unamortized debt issuance costs as of March 31, 2019 and December 31, 2018, respectively.