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Debt and Credit Arrangements - 2018 Notes (Details)
$ / shares in Units, shares in Thousands
6 Months Ended
Nov. 06, 2017
USD ($)
Aug. 03, 2011
USD ($)
$ / shares
shares
Jun. 30, 2018
USD ($)
Dec. 31, 2017
USD ($)
Debt Instrument        
Document Fiscal Year Focus     2018  
Convertible Notes, Due 2018 | Convertible Debt        
Debt Instrument        
Debt instrument stated interest rate   2.00%    
Debt instrument face amount   $ 250,000,000.0 $ 57,100,000.0 $ 57,100,000
Debt instrument effective interest rate   7.90%    
Repayment of debt $ 195,900,000      
Debt repurchased 192,900,000      
Accrued interest on debt instrument 1,000,000      
Debt extinguished $ 194,900,000      
Discount rate 4.80%      
Convertible debt $ 184,700,000   $ 56,700,000 $ 55,100,000
Loss on extinguishment of debt 4,300,000      
Interest paid 1,000,000      
Share conversion rate per 1,000 principal   0.0144865    
Debt instrument, conversion price (usd per share) | $ / shares   $ 69.03    
Warrant exercise price (usd per share) | $ / shares   $ 84.96    
Number of shares underlying warrants | shares   770    
Convertible Notes, Due 2018 | Convertible Debt | Liability Component        
Debt Instrument        
Debt instrument face amount   $ 170,900,000    
Convertible Notes, Due 2018 | Convertible Debt | Equity Component        
Debt Instrument        
Debt instrument face amount   $ 79,100,000    
Convertible Notes, Due 2018 | Convertible Debt | Liability Component        
Debt Instrument        
Debt extinguished 189,000,000      
Convertible Notes, Due 2018 | Convertible Debt | Equity Component        
Debt Instrument        
Debt extinguished $ 5,800,000      
Revolving Credit Facility | Senior secured revolving credit facility due November 2022        
Debt Instrument        
Debt instrument stated interest rate     4.25%