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Debt (Narrative) (Details)
3 Months Ended 6 Months Ended
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
USD ($)
Jun. 30, 2017
USD ($)
Jun. 30, 2018
EUR (€)
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument [Line Items]              
Additional commitments under the revolving line of credit or term loans     $ 250,000,000        
Loss on extinguishment of debt $ 3,226,000   3,226,000 $ 3,905,000      
Long-term debt           $ 824,260,000 $ 735,267,000
Foreign currency (gains) losses, net $ (2,660,000) $ (4,868,000) (4,500,000) $ (4,554,000)      
Other Financing Arrangements [Member]              
Debt Instrument [Line Items]              
Debt facility amount           43,300,000 64,500,000
Additional borrowings available           $ 21,100,000 39,400,000
2014 Credit Facility [Member]              
Debt Instrument [Line Items]              
Loss on extinguishment of debt     3,900,000        
Revolving Credit Facility [Member]              
Debt Instrument [Line Items]              
Loss on extinguishment of debt     $ 3,200,000        
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         2.50% 2.50%  
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         1.50% 1.50%  
Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage         1.50% 1.50%  
Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage         0.50% 0.50%  
Revolving Credit Facility, Maturing 2022 [Member]              
Debt Instrument [Line Items]              
Long-term debt           $ 580,000 $ 78,000,000
Amended Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate         4.09% 4.09%  
Borrowings under revolving line of credit           $ 600,000  
Additional borrowings available           $ 494,800,000  
Secured Debt [Member] | Secured Term Loan Facility $355 Million [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate         4.58% 4.58%  
Long-term debt           $ 354,100,000  
Secured Debt [Member] | Secured Term Loan Facility $235 Million [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate         4.58% 4.58%  
Long-term debt           $ 234,400,000  
Secured Debt [Member] | Secured Term Loan Facility $230 Million [Member]              
Debt Instrument [Line Items]              
Debt stated interest rate         4.58% 4.58%  
Long-term debt           $ 229,400,000  
Secured Debt [Member] | Secured Term Loan Facility $375.5 Million [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility     7 years        
Debt amount issued           357,500,000  
Secured Debt [Member] | Secured Term Loan Facility $300 Million [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility     7 years        
Debt amount issued           300,000,000  
Secured Debt [Member] | Secured Euro Term Loan Facility €250 Million [Member]              
Debt Instrument [Line Items]              
Term of debt instrument/credit facility     7 years        
Debt amount issued | €         € 250,000,000    
Secured Debt [Member] | Secured Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Additional borrowings available under the term loan facility           $ 0  
Secured Debt [Member] | Federal Funds Effective Swap Rate [Member] | Secured Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     0.50%        
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Secured Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     1.00%        
Applicable margin percentage         2.25% 2.25%  
Secured Debt [Member] | London Interbank Offered Rate (LIBOR) [Member] | Minimum [Member] | Secured Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Debt instrument, basis spread on variable rate     0.00%        
Secured Debt [Member] | Base Rate [Member] | Secured Term Loan Facility [Member]              
Debt Instrument [Line Items]              
Applicable margin percentage         1.25% 1.25%  
Secured Debt [Member] | 2014 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        
Secured Debt [Member] | Amended Credit Facility [Member]              
Debt Instrument [Line Items]              
Debt facility amount           500,000,000  
Equal quarterly installments in an amount equal to percentage of the original principal amount of the term loans     0.25%        
Secured Debt [Member] | Amended Credit Facility [Member] | Secured Term Loan Facility $355 Million [Member]              
Debt Instrument [Line Items]              
Debt amount issued           355,000,000  
Secured Debt [Member] | Amended Credit Facility [Member] | Secured Term Loan Facility $235 Million [Member]              
Debt Instrument [Line Items]              
Debt amount issued           235,000,000  
Secured Debt [Member] | Amended Credit Facility [Member] | Secured Term Loan Facility $230 Million [Member]              
Debt Instrument [Line Items]              
Debt amount issued           $ 230,000,000  
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%