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Stock Compensation (Summary Of Total Stock Compensation Expenses) (Details) - USD ($) $ in Thousands | 3 Months Ended | 9 Months Ended
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Sep. 30, 2021 | Sep. 30, 2020 | Sep. 30, 2021 | Sep. 30, 2020
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense | $ 2,990 | $ 2,518 | $ 7,895 | $ 7,888
RSA, RSU, And PSU Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense | 2,465 | 1,984 | 6,211 | 6,189
Stock Option And ESPP Option Expense [Member] |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Total stock compensation expense | $ 525 | $ 534 | $ 1,684 | $ 1,699

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- Definition Amount of cost expensed and capitalized for award under share-based payment arrangement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=120381028&loc=d3e5070-113901 + Details
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