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Share-Based Compensation Schedule Of Stock Option Transactions (Details)
$ / shares in Units, $ in Millions
6 Months Ended
Jun. 30, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award, Options, Outstanding [Roll Forward]  
Outstanding at beginning of period | shares 2,151,957
Options granted | shares 409,549
Options cancelled | shares (202,260)
Outstanding at end of period | shares 2,359,246
Options exercisable, shares | shares 1,535,515
Unvested options, shares | shares 823,731
Share-based Compensation Arrangement by Share-based Payment Award, Options, Additional Disclosures [Abstract]  
Weighted average exercise price, beginning of year | $ / shares $ 25.26
Weighted average exercise price, granted in period | $ / shares 16.98
Weighted average exercise price, canceled in period | $ / shares 27.55
Weighted average exercise price, end of year | $ / shares 23.63
Options exercisable, weighted average exercise price | $ / shares 28.04
Unvested options, weighted average exercise price | $ / shares $ 15.42
Weighted average remaining contractual term, options outstanding 4 years 25 days
Weighted average remaining contractual term, options exercisable 3 years 18 days
Weighted average remaining contractual term, options unvested 5 years 11 months 19 days
Aggregate intrinsic value, options outstanding | $ $ 0.0
Aggregate intrinsic value, options exercisable | $ 0.0
Aggregate intrinsic value, options unvested | $ $ 0.0