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Debt (Narrative) (Details) - USD ($)
6 Months Ended
May 31, 2017
Dec. 21, 2016
Jun. 30, 2017
Dec. 31, 2016
Oct. 27, 2016
Debt [Line Items]          
Current portion     $ 16,618,000    
Short-term debt weighted average interest rate     2.40% 2.20%  
Committed Revolving Credit Facilities [Member]          
Debt [Line Items]          
Maximum borrowing capacity     $ 658,122,000    
Available borrowing capacity     646,926,000    
5.375% Senior Unsecured Note, Due January 2025 [Member]          
Debt [Line Items]          
Principal amount   $ 500,000,000 500,000,000    
Debt issue costs   $ 13,883,000 13,505,000 $ 4,220,000  
Unamortized deferred debt issue costs     $ 13,505,000 $ 4,220,000  
Interest rate   5.375% 5.375% 5.375%  
Maturity date   Jan. 15, 2025 Jan. 15, 2025    
Syndicated Facilities [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Debt issue costs $ 9,529,000        
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 4,691,000        
Unamortized deferred debt issue costs     $ 4,168,000    
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 $ 4,838,000        
Unamortized deferred debt issue costs     $ 4,545,000    
Maximum [Member] | Multicurrency Facilities [Member] | Credit Agreement [Member]          
Debt [Line Items]          
Principal amount         $ 50,000,000