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Employee Benefit Plans (Schedule of Ranges of Outstanding And Exercisable Stock Optoins) (Details)
shares in Thousands
12 Months Ended
Dec. 31, 2017
$ / shares
shares
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 1,879
Outstanding Options, Weighted Average Remaining Contractual Term 6 years 1 month 18 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 34.08
Exercise Price Range, Number of Exercisable Options | shares 1,205
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 30.94
$10.69 - $31.28  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 435
Outstanding Options, Weighted Average Remaining Contractual Term 4 years 6 months 18 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 24.55
Exercise Price Range, Number of Exercisable Options | shares 334
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 22.50
$31.31 - $32.54  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 443
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 6 months 1 day
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 32.19
Exercise Price Range, Number of Exercisable Options | shares 410
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 32.16
$32.55 - $39.53  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 651
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 10 months 1 day
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 36.93
Exercise Price Range, Number of Exercisable Options | shares 459
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 35.93
$40.01 - $42.70  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 330
Outstanding Options, Weighted Average Remaining Contractual Term 9 years 4 months 20 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 42.68
Exercise Price Range, Number of Exercisable Options | shares 2
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 40.01
$49.20 - $49.20  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 20
Outstanding Options, Weighted Average Remaining Contractual Term 9 years 9 months 18 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 49.20
Exercise Price Range, Number of Exercisable Options | shares 0
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 0.00