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Basis Of Presentation And Summary Of Significant Accounting Policies (Narrative) (Details) - USD ($) $ in Thousands | Sep. 30, 2021 | Jun. 30, 2021 | Jan. 01, 2021 | Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | --- | --- | ---
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment long-term debt | $ 309,405 |  |  | $ 291,663 |  |  |
Adoption adjustment | 311,541 | $ 301,835 |  | 328,713 | $ 325,766 | $ 296,556 | $ 285,696
Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment | 22,075 | 11,493 |  | 20,022 | 23,480 | 26,350 | 36,704
Additional Paid-In Capital [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment | $ 309,290 | $ 305,157 |  | 316,192 | $ 316,394 | $ 293,022 | $ 271,782
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2020-06 [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment long-term debt |  |  | $ 20,400 |  |  |  |
Adoption adjustment |  |  |  | (19,639) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2020-06 [Member] | Retained Earnings [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment |  |  | 3,200 | (3,213) |  |  |
Cumulative Effect, Period of Adoption, Adjustment [Member] | Accounting Standards Update 2020-06 [Member] | Additional Paid-In Capital [Member] |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |
Adoption adjustment |  |  | $ 16,400 | $ (16,426) |  |  |

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