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Basis Of Presentation (Narrative) (Details) | 3 Months Ended | 9 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Sep. 30, 2019 USD ($) item | Sep. 30, 2018 USD ($) | Sep. 30, 2019 USD ($) item | Sep. 30, 2018 USD ($) | Mar. 31, 2019 USD ($) | Jan. 01, 2019 | Dec. 31, 2018 USD ($)
Lease right of use assets | $ 103,286,000 |  | $ 103,286,000 |  |  |  |
Lease liabilities | $ 115,773,000 |  | $ 115,773,000 |  |  |  |
Weighted average rate | 3.38% |  | 3.38% |  |  | 3.47% |
Number of cloud computing arrangements | item | 2 |  | 2 |  |  |  |
Effective tax rate | 11.90% | 18.60% | 15.20% | 14.50% |  |  |
Excess tax benefit on stock options reduced income tax expense | $ 8,800,000 | $ 3,100,000 | $ 18,700,000 | $ 18,600,000 |  |  |
Capitalized property and equipment | 1,100,000 |  | 1,100,000 |  |  |  | $ 3,200,000
ASU 2016-02 [Member] |  |  |  |  |  |  |
Lease right of use assets |  |  |  |  | $ 87,800,000 |  |
Lease liabilities |  |  |  |  | $ 98,700,000 |  |
Weighted average rate |  |  |  |  |  | 3.47% |
Cloud Computing [Member] | ASU No. 2018-15 [Member] |  |  |  |  |  |  |
Capitalized contract cost | $ 4,800,000 |  | 4,800,000 |  |  |  |
Capitalized contract cost, amortization expense |  |  | $ 0 |  |  |  |

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