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Share-Based Compensation Schedule Of Stock Option Transactions (Details)
$ / shares in Units, $ in Millions
9 Months Ended
Sep. 30, 2016
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of period | shares 2,200,776
Options granted | shares 438,180
Options cancelled | shares (486,999)
Outstanding at end of period | shares 2,151,957
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average exercise price, beginning of year | $ / shares $ 27.94
Weighted average exercise price, granted in period | $ / shares 10.14
Weighted average exercise price, canceled in period | $ / shares 23.77
Weighted average exercise price, end of year | $ / shares $ 25.26
Options exercisable, shares | shares 1,385,753
Options exercisable, weighted average exercise price | $ / shares $ 30.18
Unvested options, shares | shares 766,204
Unvested options, weighted average exercise price | $ / shares $ 16.38
Weighted average remaining contractual term, options outstanding 3 years 11 months
Weighted average remaining contractual term, options exercisable 2 years 10 months 10 days
Weighted average remaining contractual term, options unvested 5 years 10 months
Aggregate intrinsic value, options outstanding | $ $ 4.1
Aggregate intrinsic value, options exercisable | $ 0.2
Aggregate intrinsic value, options unvested | $ $ 3.9