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Income Taxes (Narrative) (Details) - USD ($) | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 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
Income Taxes |  |  |  |  |  |  |  |  |  |  |
Deferred Tax Assets Tax Deferred Compensation Noncurrent | $ 1,063,000 |  |  |  |  |  |  |  | $ 1,063,000 |  | $ 1,170,000
Income tax expense (benefit) | 2,680,000 | $ 1,130,000 | $ (3,805,000) | $ 700,000 | $ 1,560,000 | $ 1,460,000 | $ 1,850,000 | $ 550,000 | 705,000 | $ 5,420,000 | 5,700,000
Income Tax Examination, Penalties and Interest Accrued | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Effective income tax rate reconciliation related to impairment losses, tax benefit |  |  |  |  |  |  |  |  | (1,400,000) |  |
Effective income tax rate reconciliation related to executive compensation |  |  |  |  |  |  |  |  | 1,000,000.0 |  |
Income Tax Examination, Penalties and Interest Expense |  |  |  |  |  |  |  |  | 600 | 2,100 | $ 31,000
Deferred tax asset, valuation allowance | 0 |  |  |  | 0 |  |  |  | 0 | 0 |
Unrecognized tax benefits, income tax penalties accrued | $ 0 |  |  |  | $ 0 |  |  |  | $ 0 | $ 0 |
Effective income tax rate reconciliation, percent |  |  |  |  |  |  |  |  | (58.40%) | 29.00% |

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- Definition The tax effect as of the balance sheet date of the amount of the estimated future tax deduction arising from stock-based compensation, which can only be deducted for tax purposes when actual costs are incurred, and which can only be realized if sufficient taxable income is generated in future periods to enable the deduction to be taken. + References No definition available. + Details
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- Definition Effective income tax rate reconciliation related to executive compensation. + References No definition available. + Details
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- Definition Amount of deferred tax assets for which it is more likely than not that a tax benefit will not be realized. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32537-109319 + Details
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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 + Details
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- Definition The amount of estimated penalties and interest accrued as of the balance sheet date arising from income tax examinations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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