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Debt (Narrative) (Details) - USD ($)
1 Months Ended 3 Months Ended 6 Months Ended
Jan. 31, 2019
Jun. 29, 2018
May 30, 2018
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Jun. 30, 2019
Jun. 30, 2018
Dec. 31, 2018
Debt Instrument [Line Items]                  
Debt Extinguishment Costs         $ 0 $ (11,378,000) $ 0 $ (11,378,000)  
Document Fiscal Year Focus             2019    
Average borrowings outstanding         $ 507,700,000 $ 591,700,000 $ 499,800,000 $ 550,700,000  
Weighted average interest rate of borrowings         5.10% 5.80% 5.10% 6.00%  
Interest Income (Expense), Net         $ (6,807,000) $ (15,264,000) $ (12,532,000) $ (21,963,000)  
Interest expense         $ 8,386,000 $ 17,165,000 $ 15,811,000 $ 25,236,000  
5.75% Unsecured Notes due June 1, 2026 [Member]                  
Debt Instrument [Line Items]                  
Interest rate     5.75%   5.75%   5.75%   5.75%
Debt Instrument, Face Amount     $ 400,000,000            
Fair value of debt instrument         $ 423,000,000.0   $ 423,000,000.0   $ 406,700,000
Carrying value of debt instrument [1]         $ 395,031,000   $ 395,031,000   $ 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              
Other Indebtedness [Member]                  
Debt Instrument [Line Items]                  
Interest rate         2.00%   2.00%   2.00%
Five-Year Credit Agreement dated May 30, 2018 [Member]                  
Debt Instrument [Line Items]                  
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         $ 29,000,000   $ 29,000,000   $ 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                
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 $5.0 million and $5.3 million of unamortized debt issuance costs as of June 30, 2019 and December 31, 2018, respectively.