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Debt (Details) (USD $)
12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Debt Instrument    
Total Debt, Long-term and Short-term $ 413,027,000 $ 388,731,000
Less: current portion (17,067,000) (41,600,000)
Long-term debt 395,960,000 347,131,000
6.3% Senior Notes
   
Debt Instrument    
Senior Notes 100,000,000 100,000,000
Senior Notes, Stated Interest Rate 6.30%  
Maturity Date Jun. 25, 2015  
3.67% Percent Notes
   
Debt Instrument    
Senior Notes 50,000,000 50,000,000
Senior Notes, Stated Interest Rate 3.67%  
Maturity Date Dec. 17, 2022  
4.10% Senior Notes [Member]
   
Debt Instrument    
Senior Notes 50,000,000 0
Senior Notes, Stated Interest Rate 4.10%  
Maturity Date Sep. 19, 2023  
$800 Credit Agreement
   
Debt Instrument    
$800 million Credit Agreement, interest at LIBOR plus 75 basis points 195,960,000 197,131,000
Maturity Date Nov. 26, 2018  
Credit Agreement Borrowing Capacity 800,000,000  
$800 million Credit Agreement, Basis Spread on Variable Rate 0.75%  
Other Local Arrangements
   
Debt Instrument    
Other Local Arrangements $ 17,067,000 $ 41,600,000