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Debt (Narrative) (Details) - USD ($)
$ / shares in Units, shares in Millions
1 Months Ended 9 Months Ended
Nov. 30, 2009
Sep. 30, 2015
Sep. 30, 2014
Nov. 10, 2009
Convertible subordinated notes—4 percent        
Debt Instrument        
Hedge transactions cost $ 26,000,000      
Hedge transactions cost decrease in APIC 17,000,000      
Convertible note hedge transactions shares (in shares)   0.7    
Effective conversion price (in dollars per share)   $ 15.56    
Percentage premium over price at issuance   75.00%    
Closing price at issuance (in dollars per share)       $ 8.89
Market price per share (in dollars per share)   $ 65    
ABL Facility        
Debt Instrument        
Maximum revolving credit amount percentage   10.00%    
Convertible senior notes | Convertible subordinated notes—4 percent        
Debt Instrument        
Face amount $ 173,000,000      
Stated interest rate   4.00% 4.00%  
Common stock | Convertible subordinated notes—4 percent        
Debt Instrument        
Convertible equity shares (in shares)   0.5