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Income Taxes (Narrative) (Details) - USD ($) $ in Thousands | 3 Months Ended | 6 Months Ended |  |  |
--- | --- | --- | --- | --- | ---
Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2020 | Jun. 30, 2021 | Jun. 30, 2020 | Mar. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective income tax rate | 1.00% | 23.00% |  | 20.00% | 20.00% |  |  |
Valuation allowances against deferred tax assets | $ 11,500 |  |  | $ 11,500 |  |  | $ 7,200 |
Net deferred tax liability | 27,900 |  |  | 27,900 |  |  | 33,300 |
Income tax expense | (5) | $ (1,077) |  | (1,368) | $ (2,547) |  |  |
Adoption adjustment | 301,835 | 296,556 | $ 276,609 | 301,835 | 296,556 | $ 297,331 | 328,713 | $ 285,696
Reduction to income taxes payable and deferred tax assets |  |  | 1,300 |  |  |  |  |
Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Adoption adjustment | (19,639) |  |  | (19,639) |  |  |  |
Retained Earnings [Member] |  |  |  |  |  |  |  |
Adoption adjustment | 11,493 | 26,350 | 30,039 | 11,493 | 26,350 | 13,671 | 20,022 | 36,704
Retained Earnings [Member] | Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Adoption adjustment | (3,213) |  |  | (3,213) |  |  | 3,200 |
Additional Paid-In Capital [Member] |  |  |  |  |  |  |  |
Adoption adjustment | 305,157 | $ 293,022 | $ 273,821 | 305,157 | $ 293,022 | $ 301,449 | 316,192 | $ 271,782
Additional Paid-In Capital [Member] | Accounting Standards Update 2020-06 [Member] | Cumulative Effect, Period of Adoption, Adjustment [Member] |  |  |  |  |  |  |  |
Adoption adjustment | $ (16,426) |  |  | $ (16,426) |  |  | $ 16,400 |

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