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Employee Benefit Plans (Stock Options Outstanding And Exercisable) (Details)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2017
USD ($)
$ / shares
shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 87,605
Aggregate Intrinsic Value (in thousands) | $ $ 1,781
No. of Options Currently Exercisable | shares 7,887
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 238
$ 30.00 - 34.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 500
Weighted-Average Remaining Contractual Life (Months) $ 30.38
Weighted-Average Remaining Contractual Life (Months) 11 months
Aggregate Intrinsic Value (in thousands) | $ $ 19
No. of Options Currently Exercisable | shares 500
Weighted-Average Exercise Price of Options Currently Exercisable $ 30.38
Weighted-Average Remaining Contractual Life (Months) 11 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 19
$ 30.00 - 34.99 | Minimum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 30.00
$ 30.00 - 34.99 | Maximum  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
Ranges Of Exercise Prices $ 34.99
35.00 - 39.99  
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]  
No. of Options Outstanding | shares 20,854
Weighted-Average Remaining Contractual Life (Months) $ 37.13
Weighted-Average Remaining Contractual Life (Months) 4 years 11 months
Aggregate Intrinsic Value (in thousands) | $ $ 633
No. of Options Currently Exercisable | shares 5,379
Weighted-Average Exercise Price of Options Currently Exercisable $ 35.39
Weighted-Average Remaining Contractual Life (Months) 4 years 2 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 173
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 35,659
Weighted-Average Remaining Contractual Life (Months) $ 43.95
Weighted-Average Remaining Contractual Life (Months) 7 years 7 months
Aggregate Intrinsic Value (in thousands) | $ $ 839
No. of Options Currently Exercisable | shares 2,008
Weighted-Average Exercise Price of Options Currently Exercisable $ 44.43
Weighted-Average Remaining Contractual Life (Months) 6 years 2 months
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 46
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 12,961
Weighted-Average Remaining Contractual Life (Months) $ 46.61
Weighted-Average Remaining Contractual Life (Months) 7 years 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 270
No. of Options Currently Exercisable | shares 0
Weighted-Average Exercise Price of Options Currently Exercisable $ 0.00
Aggregate Intrinsic Value of Options Currently Exercisable (in thousands) | $ $ 0
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) 9 years 2 months
Aggregate Intrinsic Value (in thousands) | $ $ 20
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