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Debt (Narrative) (Details) - USD ($)
May 31, 2017
Dec. 21, 2016
Dec. 31, 2017
Dec. 31, 2016
Oct. 27, 2016
Debt [Line Items]          
Current portion     $ 16,907,000    
Short-term debt weighted average interest rate     2.70% 2.20%  
Committed Revolving Credit Facilities [Member]          
Debt [Line Items]          
Maximum borrowing capacity     $ 646,991,000    
Available borrowing capacity     637,806,000    
5.375% Senior Unsecured Note, Due January 2025 [Member]          
Debt [Line Items]          
Principal amount   $ 500,000,000      
Debt issue costs   $ 13,945,000 12,661,000 $ 4,220,000  
Unamortized deferred debt issue costs     $ 12,661,000 4,220,000  
Interest rate   5.375% 5.375%    
Maturity date   Jan. 15, 2025      
Syndicated Facilities [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Debt issue costs $ 9,682,000        
Unamortized deferred debt issue costs       $ 6,182,000  
Multicurrency Facilities [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Principal amount         $ 675,000,000
Debt issue costs 4,731,000        
Unamortized deferred debt issue costs     $ 3,768,000    
Delayed-Draw Facility [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Principal amount $ 325,000,000       325,000,000
Amortization, first period 5.00%        
Amortization, second period 10.00%        
Debt issue costs $ 4,951,000        
Unamortized deferred debt issue costs     $ 4,134,000    
Maximum [Member] | Multicurrency Facilities [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Principal amount         $ 50,000,000