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Share-Based Compensation Schedule Of Stock Option Transactions (Details)
$ / shares in Units, $ in Millions
3 Months Ended
Mar. 31, 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 436,726
Options cancelled | shares (386,999)
Outstanding at end of period | shares 2,250,503
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 10.12
Weighted average exercise price, canceled in period | $ / shares 23.98
Weighted average exercise price, end of year | $ / shares $ 25.17
Options exercisable, shares | shares 1,448,779
Options exercisable, weighted average exercise price | $ / shares $ 30.00
Unvested options, shares | shares 801,724
Unvested options, weighted average exercise price | $ / shares $ 16.43
Weighted average remaining contractual term, options outstanding 4 years 2 months 20 days
Weighted average remaining contractual term, options exercisable 3 years 21 days
Weighted average remaining contractual term, options unvested 6 years 3 months 26 days
Aggregate intrinsic value, options outstanding | $ $ 1.7
Aggregate intrinsic value, options exercisable | $ 0.0
Aggregate intrinsic value, options unvested | $ $ 1.7