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Indebtedness (Narrative) (Details)
9 Months Ended0 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended3 Months Ended9 Months Ended
Sep. 30, 2011
USD ($)
Dec. 31, 2010
USD ($)
May 02, 2011
6 7/8% Senior Subordinated Notes Due April 15, 2014 [Member]
Sep. 30, 2011
6 7/8% Senior Subordinated Notes Due April 15, 2014 [Member]
USD ($)
Sep. 30, 2011
6 7/8% Senior Subordinated Notes Due April 15, 2014 [Member]
USD ($)
Sep. 30, 2011
6 7/8% Senior Subordinated Notes Due April 15, 2014 [Member]
EUR (€)
Dec. 31, 2010
6 7/8% Senior Subordinated Notes Due April 15, 2014 [Member]
USD ($)
Sep. 30, 2011
4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member]
USD ($)
Sep. 30, 2011
4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member]
USD ($)
Sep. 30, 2011
4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member]
EUR (€)
Dec. 31, 2010
4 1/2% Senior Unsecured Term Loan Due May 2, 2016 [Member]
USD ($)
Sep. 30, 2011
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 [Member]
USD ($)
Sep. 30, 2010
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 [Member]
Sep. 30, 2011
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 [Member]
USD ($)
Sep. 30, 2010
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 [Member]
Dec. 31, 2010
1 3/4% Convertible Senior Subordinated Notes Due December 31, 2033 [Member]
USD ($)
Sep. 30, 2011
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Sep. 30, 2011
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Dec. 31, 2010
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Debt maturity date    April 15, 2014April 15, 2014  May 2, 2016May 2, 2016 December 31, 2033    December 15, 2036  
Convertible senior subordinated notes conversion price             $ 22.36   $ 40.73 
Convertible senior subordinated notes, conversion rate             44.7193   24.5525 
Convertible senior subordinated notes principal amount           $ 1,000 $ 1,000  $ 1,000$ 1,000 
Debt conversion, converted amount             161,000,000     
Shares issued in association with conversion           3,926,574 3,926,574     
Excess conversion value of the notes             195,900,000     
Repayment of the principal of the notes total             161,000,000     
Debt principal amount     200,000,000   200,000,000 0 0 161,000,000201,300,000201,300,000201,300,000
Debt Instruments Maturity Date    April 15, 2014April 15, 2014  May 2, 2016May 2, 2016 December 31, 2033    December 15, 2036  
Debt Instrument Discount Amortization PeriodDecember 2013                  
Closing sales price of common stock, maximum percentage             120.00%     
Convertible senior subordinated notes redeemed of the principal amount percent  101.146%                
Loss on extinguishment of notes       3,100,000           
Write-off of unamortized deferred debt issuance costs associated with the redemption of notes   1,200,000               
Fair Value      271,700,000        325,100,000225,100,000225,100,000277,100,000
Net carrying amount   00 267,700,000269,000,000269,000,000 00 0 161,000,000181,400,000181,400,000175,200,000
Letters of credit, outstanding$ 10,000,000$ 9,800,000                 
Convertible senior subordinated notes stated percent   6.875%6.875%6.875% 4.50%4.50%4.50% 1.75% 1.75%  1.25%1.25% 
Convertible senior subordinated notes conversion feature             1 3/4% convertible senior subordinated notes for at least 20 trading days in the 30 consecutive trading days   1 1/4% convertible senior subordinated notes for at least 20 trading days in the 30 consecutive trading days 
Effective interest rate            6.10% 6.10% 6.10%6.10%