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Income Taxes - Reconciliation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at federal statutory rate |  |  |  |  |  |  |  |  | $ 167,294 | $ 36,400 | $ 20,031
State, net of federal benefit |  |  |  |  |  |  |  |  | 2,466 | 1,635 | 622
Contingent liabilities |  |  |  |  |  |  |  |  | 18 | 948 | 903
Share-based compensation |  |  |  |  |  |  |  |  | (819) | (8,131) | (4,019)
FDII |  |  |  |  |  |  |  |  | (402) | 0 | 0
Research and development credits |  |  |  |  |  |  |  |  | (879) | (2,758) | (2,821)
Change in uncertain tax positions |  |  |  |  |  |  |  |  | 441 | 858 | 1,308
Rate change for changes in federal or state law |  |  |  |  |  |  |  |  | (210) | 178 | 32,429
Change in valuation allowance |  |  |  |  |  |  |  |  | (1,193) | (4,225) | (4,169)
Expired NOLs and credits |  |  |  |  |  |  |  |  | 0 | 3,054 | 0
Change in derivatives |  |  |  |  |  |  |  |  | 0 | 615 | 0
Other |  |  |  |  |  |  |  |  | 621 | 1,435 | 391
Income tax expense from continuing operations | $ (810) | $ (4,620) | $ (3,609) | $ 176,376 | $ (14,307) | $ 11,864 | $ 22,419 | $ 10,033 | $ 167,337 | $ 30,009 | $ 44,675

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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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- Definition Amount of reported income tax expense (benefit) in excess of (less than) expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to nondeductible expense for award under share-based payment arrangement. Includes, but is not limited to, expense determined to be nondeductible upon grant or after 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 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 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 + Details
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