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Basis Of Presentation (Narrative) (Details) - USD ($) | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018 | Mar. 31, 2019 | Jan. 01, 2019 | Dec. 31, 2018
Lease right of use assets | $ 90,755,000 |  | $ 90,755,000 |  |  |  |
Lease liabilities | $ 101,593,000 |  | $ 101,593,000 |  |  |  |
Weighted average rate | 3.46% |  | 3.46% |  |  | 3.47% |
Effective tax rate | 21.10% | 4.70% | 17.10% | 12.20% |  |  |
Excess tax benefit on stock options reduced income tax expense | $ 3,200,000 | $ 11,700,000 | $ 9,900,000 | $ 15,500,000 |  |  |
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 | $ 2,800,000 |  | 2,800,000 |  |  |  |
Capitalized contract cost, amortization expense |  |  | $ 0 |  |  |  |

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