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Quarterly Information (Unaudited) (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Loss on extinguishment of debt |  | $ 5,600,000 |  |  |  |  |  | $ 5,569,000 | $ 0 | $ 0
Intangible asset, pre-tax impairment charge |  |  |  |  |  |  |  |  | 3,300,000 | 0
Stock-based compensation, net excess tax benefits | $ 600,000 |  | $ (100,000) | $ 1,600,000 |  |  | $ 2,300,000 | $ 500,000 | 3,900,000 | $ 1,600,000
Income tax effects from changes in tax rates | $ 2,500,000 |  |  | (5,900,000) | $ (500,000) | $ (1,400,000) |  |  |  |
Pre-Qualifications [Member] |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information [Line Items] |  |  |  |  |  |  |  |  |  |
Intangible asset, pre-tax impairment charge |  |  |  | $ 3,300,000 |  |  |  |  | $ 3,300,000 |

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