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Debt (Narrative) (Details)
3 Months Ended
Mar. 31, 2018
USD ($)
Mar. 31, 2017
USD ($)
Mar. 31, 2018
EUR (€)
Mar. 31, 2018
USD ($)
Dec. 31, 2017
USD ($)
Jun. 30, 2017
EUR (€)
Jun. 30, 2017
USD ($)
Debt Instrument [Line Items]              
Equal quarterly installments in an amount equal to percentage of the original principal amount of the term loans 0.25%            
Additional commitments under the revolving line of credit or term loans $ 250,000,000            
Loss on extinguishment of debt   $ 3,905,000          
Long-term debt       $ 781,745,000 $ 735,267,000    
Foreign currency (gains) losses, net (1,840,000) $ 314,000          
Other Financing Arrangements [Member]              
Debt Instrument [Line Items]              
Debt facility amount       45,600,000 64,500,000    
Additional borrowings available       $ 13,100,000 39,400,000    
Previous Credit Facility [Member]              
Debt Instrument [Line Items]              
Loss on extinguishment of debt $ 3,900,000            
Revolving Credit Facility [Member] | Federal Funds Effective Swap Rate [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.50%            
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 1.00%            
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage     2.75% 2.75%      
Revolving Credit Facility [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.00%            
Applicable margin percentage     1.75% 1.75%      
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage     1.75% 1.75%      
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage     0.75% 0.75%      
Revolving Credit Facility, Maturing 2022 [Member]              
Debt Instrument [Line Items]              
Long-term debt       $ 118,183,000 $ 78,000,000    
Secured Debt [Member] | Previous Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt facility amount       400,000,000      
Term of debt instrument/credit facility 5 years            
Secured Debt [Member] | Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt facility amount       400,000,000      
Term of debt instrument/credit facility 5 years            
Additional borrowings available       $ 277,200,000      
Secured Debt [Member] | Revolving Credit Facility, Maturing 2022 [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate     4.04% 4.04%      
Borrowings under revolving line of credit       $ 118,200,000      
Previous Secured Term Loan [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility 7 years            
Debt amount issued       300,000,000      
Secured Term Loan [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility 7 years            
Debt amount issued       357,500,000      
Long-term debt       353,900,000      
Additional borrowings available under the term loan facility       $ 0      
Applicable margin percentage     4.38% 4.38%      
Secured Term Loan [Member] | Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Debt amount issued             $ 150,000,000
Applicable margin percentage     4.27% 4.27%      
Secured Term Loan [Member] | Federal Funds Effective Swap Rate [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.50%            
Secured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 1.00%            
Applicable margin percentage     2.50% 2.50%      
Secured Term Loan [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.75%            
Secured Term Loan [Member] | Base Rate [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage     1.50% 1.50%      
Secured Euro Term Loan [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility 7 years            
Debt amount issued | €     € 250,000,000        
Long-term debt     € 247,500,000 $ 305,100,000      
Applicable margin percentage     2.75% 2.75%      
Secured Euro Term Loan [Member] | Interest Rate Swap [Member]              
Debt Instrument [Line Items]              
Debt amount issued | €           € 90,000,000  
Applicable margin percentage     3.00% 3.00%      
Secured Euro Term Loan [Member] | EURIBOR [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate 0.00%            
Applicable margin percentage     2.75% 2.75%      
U.S. Subsidiaries [Member]              
Debt Instrument [Line Items]              
Stock pledged as collateral, percentage 100.00%            
Foreign Subsidiaries [Member]              
Debt Instrument [Line Items]              
Stock pledged as collateral, percentage 65.00%