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Debt (Details)
€ in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
Dec. 31, 2015
EUR (€)
Jun. 25, 2015
USD ($)
Dec. 31, 2014
USD ($)
Debt Instrument        
Senior Notes $ 250,000      
Total Debt, Long-term and Short-term 591,472     $ 451,954
Less: current portion (14,488)     (116,164)
Long-term debt 576,984     335,790
6.3% Senior Notes        
Debt Instrument        
Senior Notes $ 0   $ 100,000 $ 100,000
Senior Notes, Stated Interest Rate     6.30% 6.30%
Maturity Date Jun. 25, 2015      
3.67% Percent Notes        
Debt Instrument        
Senior Notes $ 50,000     $ 50,000
Senior Notes, Stated Interest Rate 3.67% 3.67%    
Maturity Date Dec. 17, 2022      
4.10% Senior Notes [Member]        
Debt Instrument        
Senior Notes $ 50,000     50,000
Senior Notes, Stated Interest Rate 4.10% 4.10%    
Maturity Date Sep. 19, 2023      
3.84% Senior Notes [Member]        
Debt Instrument        
Senior Notes $ 125,000     125,000
Senior Notes, Stated Interest Rate 3.84% 3.84%    
Maturity Date Sep. 19, 2024      
4.24% Senior Notes [Member]        
Debt Instrument        
Senior Notes $ 125,000     0
Senior Notes, Stated Interest Rate 4.24% 4.24%    
Maturity Date Jun. 25, 2025      
1.47% EURO Senior Notes [Member]        
Debt Instrument        
Senior Notes $ 136,575 € 125,000   0
Senior Notes, Stated Interest Rate 1.47% 1.47%    
Maturity Date Jun. 17, 2030      
$800 Million 2015 Credit Agreement        
Debt Instrument        
$800 million Credit Agreement, interest at LIBOR plus 87.5 basis points $ 90,409     110,790
Maturity Date Dec. 17, 2020      
Credit Agreement Borrowing Capacity $ 800,000      
$800 million Credit Agreement, Basis Spread on Variable Rate 0.875%      
Other Local Arrangements        
Debt Instrument        
Other Local Arrangements $ 14,488     $ 16,164