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Employee Benefit Plans (Stock Options Outstanding And Exercisable) (Details)
$ / shares in Units, $ in Thousands
9 Months Ended
Sep. 30, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 58,472
Aggregate Intrinsic Value (in thousands) | $ $ 1,510
No. of Options Currently Exercisable (in shares) | shares 3,197
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 108
$30.00 - $34.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 500
Weighted-Average Exercise Price (in dollars per share) $ 30.38
Weighted-Average Remaining Contractual Life (Years) 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 23
No. of Options Currently Exercisable (in shares) | shares 500
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share) $ 30.38
Weighted-Average Remaining Contractual Life (Years) 2 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 23
$30.00 - $34.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 30
$30.00 - $34.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 34.99
35.00 - 39.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 38
Weighted-Average Exercise Price (in dollars per share) $ 37.74
Weighted-Average Remaining Contractual Life (Years) 4 years 5 months
Aggregate Intrinsic Value (in thousands) | $ $ 1
No. of Options Currently Exercisable (in shares) | shares 38
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share) $ 37.74
Weighted-Average Remaining Contractual Life (Years) 4 years 5 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 1
35.00 - 39.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 35
35.00 - 39.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 39.99
40.00 - 44.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 30,676
Weighted-Average Exercise Price (in dollars per share) $ 43.87
Weighted-Average Remaining Contractual Life (Years) 7 years
Aggregate Intrinsic Value (in thousands) | $ $ 1,010
No. of Options Currently Exercisable (in shares) | shares 1,675
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share) $ 44.43
Weighted-Average Remaining Contractual Life (Years) 5 years 6 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 54
40.00 - 44.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 40
40.00 - 44.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 44.99
45.00 - 49.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 9,627
Weighted-Average Exercise Price (in dollars per share) $ 46.61
Weighted-Average Remaining Contractual Life (Years) 6 years 5 months
Aggregate Intrinsic Value (in thousands) | $ $ 291
No. of Options Currently Exercisable (in shares) | shares 984
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share) $ 46.61
Weighted-Average Remaining Contractual Life (Years) 6 years 5 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 30
45.00 - 49.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 45
45.00 - 49.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 49.99
65.00 - 70.00  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding (in shares) | shares 17,631
Weighted-Average Exercise Price (in dollars per share) $ 66.32
Weighted-Average Remaining Contractual Life (Years) 8 years 5 months
Aggregate Intrinsic Value (in thousands) | $ $ 185
No. of Options Currently Exercisable (in shares) | shares 0
Weighted-Average Exercise Price of Options Currently Exercisable (in dollars per share) $ 0.00
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 0
65.00 - 70.00 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 65
65.00 - 70.00 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices (in dollars per share) $ 70