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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, 2015
$ / shares
shares
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 2,461
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 7 months 27 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 30.08
Exercise Price Range, Number of Exercisable Options | shares 1,784
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 29.26
$10.69 - $28.79  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 591
Outstanding Options, Weighted Average Remaining Contractual Term 3 years 3 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 20.84
Exercise Price Range, Number of Exercisable Options | shares 585
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 20.77
$29.23 - $31.31  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 573
Outstanding Options, Weighted Average Remaining Contractual Term 6 years 7 months 24 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 30.86
Exercise Price Range, Number of Exercisable Options | shares 274
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 30.39
$31.45 - $32.54  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 557
Outstanding Options, Weighted Average Remaining Contractual Term 7 years 6 months 10 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 32.49
Exercise Price Range, Number of Exercisable Options | shares 291
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 32.48
$32.55 - $35.32  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 583
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 8 months 12 days
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 34.24
Exercise Price Range, Number of Exercisable Options | shares 504
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 34.32
$36.80 - $40.01  
Shares Authorized under Stock Option Plans, Exercise Price Range [Line Items]  
Number of Outstanding Options | shares 157
Outstanding Options, Weighted Average Remaining Contractual Term 5 years 3 months
Outstanding Options, Weighted Average Exercise Price | $ / shares $ 38.13
Exercise Price Range, Number of Exercisable Options | shares 130
Exercisable Options, Weighted Average Exercise Price | $ / shares $ 38.36