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Employee Benefit Plans (Stock Options Outstanding And Exercisable) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 57,972
Aggregate Intrinsic Value (in thousands) | $ $ 953
No. of Options Currently Exercisable | shares 2,697
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 61
35.00 - 39.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 38
Weighted-Average Remaining Contractual Life (Months) $ 37.74
Weighted-Average Remaining Contractual Life (Months) 4 years 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 1
No. of Options Currently Exercisable | shares 38
Weighted-Average Exercise Price of Options Currently Exercisable $ 37.74
Weighted-Average Remaining Contractual Life (Months) 4 years 2 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 $ 35.00
35.00 - 39.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 39.99
40.00 - 44.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 30,676
Weighted-Average Remaining Contractual Life (Months) $ 43.87
Weighted-Average Remaining Contractual Life (Months) 6 years 9 months
Aggregate Intrinsic Value (in thousands) | $ $ 728
No. of Options Currently Exercisable | shares 1,675
Weighted-Average Exercise Price of Options Currently Exercisable $ 44.43
Weighted-Average Remaining Contractual Life (Months) 5 years 2 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 39
40.00 - 44.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 40.00
40.00 - 44.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 44.99
45.00 - 49.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 9,627
Weighted-Average Remaining Contractual Life (Months) $ 46.61
Weighted-Average Remaining Contractual Life (Months) 6 years 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 202
No. of Options Currently Exercisable | shares 984
Weighted-Average Exercise Price of Options Currently Exercisable $ 46.61
Weighted-Average Remaining Contractual Life (Months) 6 years 2 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 21
45.00 - 49.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 45.00
45.00 - 49.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 49.99
50.00 - 69.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 17,631
Weighted-Average Remaining Contractual Life (Months) $ 66.32
Weighted-Average Remaining Contractual Life (Months) 8 years 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 22
No. of Options Currently Exercisable | shares 0
Weighted-Average Exercise Price of Options Currently Exercisable $ 0
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 0
50.00 - 69.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 50.00
50.00 - 69.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 69.99