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Net (Loss) Income Per Share (Narrative) (Details) - $ / shares
shares in Millions
3 Months Ended
Mar. 31, 2016
Mar. 31, 2015
1.75% Convertible Senior Subordinated Notes due 2015    
Short-term Debt [Line Items]    
Interest Rate (percent) 1.75%  
Convertible notes, maturity date Apr. 15, 2015  
Initial conversion price (in dollars per share) $ 29.20  
Stock Options And Stock Awards    
Antidilutive Securities Excluded from Computation of Earnings Per Share [Line Items]    
Antidilutive shares excluded from calculation (shares)   0.8