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Employee Incentive, Deferred Compensation, And Retirement Plans (Stock Option Activity) (Details)
$ / shares in Units, shares in Thousands, $ in Thousands
12 Months Ended
Dec. 31, 2015
USD ($)
$ / shares
shares
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]  
Outstanding Options, Beginning balance | shares 126
Exercised, Options | shares 44
Outstanding Options, Ending balance | shares 82
Outstanding, Weighted-average exercise price, Beginning balance | $ / shares $ 31.61
Exercised, Weighted-average exercise price | $ / shares 16.48
Outstanding, Weighted-average exercise price, Ending balance | $ / shares $ 39.88
Outstanding, Weighted-average remaining contractual term 1 year 7 months 13 days
Outstanding, Aggregate intrinsic value | $ $ 1,156