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Indebtedness (Narrative) (Details)
 3 Months Ended 3 Months Ended 3 Months Ended
Mar. 31, 2014
USD ($)
Dec. 31, 2013
USD ($)
Mar. 31, 2014
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Mar. 31, 2013
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Dec. 31, 2013
1 1/4% Convertible Senior Subordinated Notes Due December 15, 2036 [Member]
USD ($)
Mar. 31, 2014
4 1/2% Senior Unsecured Term Loan Due 2016 [Member]
USD ($)
Mar. 31, 2014
4 1/2% Senior Unsecured Term Loan Due 2016 [Member]
EUR (€)
Dec. 31, 2013
4 1/2% Senior Unsecured Term Loan Due 2016 [Member]
USD ($)
Mar. 31, 2014
5 7/8% Senior Notes due 2021 [Member]
USD ($)
Dec. 31, 2013
5 7/8% Senior Notes due 2021 [Member]
USD ($)
Mar. 31, 2014
5 7/8% Senior Notes due 2021 [Member]
Interest Accrual, Option Two [Member]
Mar. 31, 2014
Revolving Credit Facility [Member]
USD ($)
Mar. 31, 2014
Credit Facility [Domain]
Interest Accrual, Option Two [Member]
Mar. 31, 2014
Credit Facility [Domain]
Interest Accrual, Option Three [Member]
Mar. 31, 2014
Credit Facility [Domain]
Minimum [Member]
Interest Accrual, Option One [Member]
Mar. 31, 2014
Credit Facility [Domain]
Minimum [Member]
Interest Accrual, Option Three [Member]
Variable Basis, Additional Margin [Member]
Mar. 31, 2014
Credit Facility [Domain]
Maximum [Member]
Interest Accrual, Option One [Member]
Mar. 31, 2014
Credit Facility [Domain]
Maximum [Member]
Interest Accrual, Option Three [Member]
Variable Basis, Additional Margin [Member]
Mar. 31, 2014
Term Loan Facility [Member]
USD ($)
Mar. 31, 2014
Term Loan Facility [Member]
Future Periodic Payment [Member]
USD ($)
Debt Instrument [Line Items]                                        
Debt Instrument, Convertible, Carrying Amount of Equity Component     $ 32,300,000   $ 54,300,000                              
Interest expense on the liability component of convertible debt     600,000 2,900,000                                
Debt instrument, interest rate, effective percentage       6.10%                                
Debt maturity date     Dec. 15, 2036                                  
Convertible senior subordinated notes conversion price (in dollars per share)     $ 40.36                                  
Convertible senior subordinated notes, conversion rate     24.7799                                  
Convertible senior subordinated notes, principal amount     1,000                                  
Convertible senior subordinated notes, triggering event, percent of closing sales price to conversion price     120.00%                                  
Senior notes           275,500,000 200,000,000.0 275,000,000 300,000,000 300,000,000                    
Days within trading period required to trigger qualifying event     20 days                                  
Trading period in which qualifying event must occur     30 days                                  
Maximum borrowing capacity on line of credit facility                       600,000,000             355,000,000  
Periodic payment required on term loan                                     5,000,000 10,000,000
Margin on variable rate                     0.50%   0.50% 1.00% 1.00% 0.00% 2.00% 0.50%    
Credit facility 437,300,000 360,000,000                                    
Remaining borrowing capacity on line of credit facility 517,700,000 600,000,000                                    
Long-term debt, estimated fair value     202,200,000   290,500,000       329,100,000 322,100,000                    
Convertible debt 151,600,000 201,200,000                                    
Outstanding letters of credit 19,600,000 16,700,000                                    
Debt converted     49,600,000                                  
Shares issued     377,957                                  
Excess conversion value of notes     $ 21,900,000