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Debt (Textuals) (Details)
12 Months Ended 3 Months Ended 3 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 12 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2012
USD ($)
Dec. 31, 2011
USD ($)
Dec. 31, 2010
USD ($)
Dec. 31, 2012
Senior A Notes Due 2022 [Member]
Dec. 31, 2012
Senior B Notes Due 2024 [Member]
Dec. 31, 2012
Senior C Notes Due 2027 [Member]
Jun. 30, 2012
Revolving Credit Facility Due 2014 [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility Due 2014 [Member]
USD ($)
Dec. 31, 2011
Revolving Credit Facility Due 2014 [Member]
USD ($)
Jun. 30, 2012
Revolving Credit Facility Due 2017 [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility Due 2017 [Member]
USD ($)
Dec. 31, 2012
Revolving Credit Facility Due 2017 [Member]
JPY (¥)
Dec. 31, 2011
Revolving Credit Facility Due 2017 [Member]
USD ($)
Dec. 31, 2012
$50 Million Credit Facility [Member]
USD ($)
Dec. 31, 2012
Term Loan Due 2018 [Member]
USD ($)
Dec. 31, 2011
Term Loan Due 2018 [Member]
USD ($)
Dec. 31, 2012
Senior Floating Notes [Member]
USD ($)
instrument
Dec. 31, 2011
Series A Floating Rate Notes Due 2012 [Member]
USD ($)
Dec. 31, 2012
Series A Floating Rate Notes Due 2012 [Member]
USD ($)
Dec. 31, 2012
Series B Floating Rate Notes Due 2015 [Member]
USD ($)
Dec. 31, 2011
Series B Floating Rate Notes Due 2015 [Member]
USD ($)
Dec. 31, 2012
Euro-denominated Notes [Member]
EUR (€)
Dec. 31, 2012
EURO Note A Due 2013 [Member]
USD ($)
Dec. 31, 2012
EURO Note A Due 2013 [Member]
EUR (€)
Dec. 31, 2011
EURO Note A Due 2013 [Member]
USD ($)
Dec. 31, 2012
EURO Note B Due 2016 [Member]
USD ($)
Dec. 31, 2012
EURO Note B Due 2016 [Member]
EUR (€)
Dec. 31, 2011
EURO Note B Due 2016 [Member]
USD ($)
Dec. 31, 2012
Convertible Debt Due 2047 [Member]
USD ($)
Jun. 30, 2012
Convertible Debt Due 2047 [Member]
USD ($)
Dec. 31, 2012
Convertible Debt Due 2047 [Member]
USD ($)
Dec. 31, 2011
Convertible Debt Due 2047 [Member]
USD ($)
Dec. 31, 2012
Senior Notes [Member]
USD ($)
Dec. 31, 2012
Senior Notes [Member]
Senior A Notes Due 2022 [Member]
USD ($)
Dec. 31, 2011
Senior Notes [Member]
Senior A Notes Due 2022 [Member]
USD ($)
Dec. 31, 2012
Senior Notes [Member]
Senior B Notes Due 2024 [Member]
USD ($)
Dec. 31, 2011
Senior Notes [Member]
Senior B Notes Due 2024 [Member]
USD ($)
Dec. 31, 2012
Senior Notes [Member]
Senior C Notes Due 2027 [Member]
USD ($)
Dec. 31, 2011
Senior Notes [Member]
Senior C Notes Due 2027 [Member]
USD ($)
Dec. 31, 2012
Letter of Credit [Member]
Revolving Credit Facility Due 2017 [Member]
USD ($)
Feb. 26, 2013
Subsequent Event [Member]
$50 Million Credit Facility [Member]
USD ($)
Line of Credit Facility [Line Items]                                                                                  
Line of Credit Facility, expiration date                   Apr. 30, 2017                                                              
Line of Credit Facility, current borrowing capacity                   $ 300,000,000                                                              
Line of Credit Facility, maximum borrowing capacity                   350,000,000       50,000,000                                                      
Credit facility is available for swing-line loans                   30,000,000                                                              
Credit available for the issuance of letters of credit                   30,000,000                                                              
Line of credit interest rate margin added to Libor at minimum (in hundredths)                   1.25%                                                              
Line of credit interest rate margin added to Libor at maximum (in hundredths)                   2.25%                                                              
Debt issuance cost             800,000     1,600,000                                             1,200,000                
Long-term debt 411,500,000 349,400,000              6,400,000   71,500,000 5,800,000      35,300,000    75,000,000        25,000,000   26,900,000   26,300,000 80,800,000   79,000,000     3,100,000 161,500,000 168,000,000 42,000,000    53,000,000    73,000,000       
Line of Credit, current                     5,700,000                                                            
Line of Credit, noncurrent                     65,800,000                                                            
Outstanding amount                                                                               3,600,000 42,800,000
Line of Credit Facility, unused commitment level                     224,900,000                                                            
Term of debt                           5 years                 7 years 7 years   10 years 10 years                            
Variable rate basis                           one-month LIBOR           LIBOR                                          
Basis spread on variable interest rate                           1.50%           0.90%                                          
Credit facility agreement, leverage ratio description                           total leverage ratio no greater than 3.50 to 1.00                                                      
Credit facility agreement, interest coverage ratio description                           interest coverage ratio greater than or equal to 2.50 to 1.00                                                      
Debt issuance costs                           300,000                                                      
Number of tranches                                 2                                                
Debt Instrument, face amount                                   50,000,000   25,000,000   81,500,000   20,400,000     61,100,000                            
Debt instrument, maturity date                                   Jul. 28, 2012   Jul. 28, 2015     Feb. 27, 2013 Feb. 27, 2013   Feb. 27, 2016 Feb. 27, 2016   Mar. 15, 2047                        
Debt instrument, stated interest rate       3.67% 3.82% 4.02%         1.71% 1.71%     5.41%         1.21%     4.215% 4.215%   4.38% 4.38%   4.00%   4.00%     3.67%   3.82%   4.02%      
Long-term debt 378,800,000 299,300,000                                                     161,500,000                        
Conversion ratio of debt per $1,000 of debt                                                         18.1227                        
Convertbile debt, conversion price (in usd per share)                                                         $ 55.18                        
Debentures automatic conversion feature                                                         Subsequent to March 20, 2012, if our common stock closing price exceeds 150% of the then prevailing conversion price for at least 20 trading days during any 30 consecutive trading day period, we have the option to cause the debentures to be automatically converted into West shares at the prevailing conversion rate                        
Debt instrument, repurchase amount                                                           158,400,000                      
Percentage of convertible debt repurchased                                                           98.06%                      
Purchase price paid for convertible debt                                                           1,038.91                      
Loss on debt extinguishment                                                           11,600,000                      
Purchase premium paid, convertible debt                                                           6,200,000                      
Write off of unamortized debt issuance costs                                                           4,400,000                      
Payments of debt extinguishment costs                                                           1,000,000                      
Weighted average of the coupon interest rate                                                                 3.87%                
Annual effective interest rate                                                                 4.16%                
Interest expense 18,600,000 19,300,000 17,700,000                                                                            
Aggregate annual maturities of long-term debt [Abstract]                                                                                  
2014 100,000                                                                                
2015 25,000,000                                                                                
2016 81,500,000                                                                                
2017 65,800,000                                                                                
2018 35,300,000                                                                                
Thereafter $ 171,100,000