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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, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | Jun. 30, 2017 | Mar. 31, 2017 | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Expense (Benefit), Continuing Operations, Income Tax Reconciliation [Abstract] |  |  |  |  |  |  |  |  |  |  |
Tax at federal statutory rate |  |  |  |  |  |  |  |  | $ 36,400 | $ 20,031 | $ 2,786
State, net of federal benefit |  |  |  |  |  |  |  |  | 1,635 | 622 | 175
Contingent liabilities |  |  |  |  |  |  |  |  | 948 | 903 | 1,225
Stock-based compensation |  |  |  |  |  |  |  |  | (8,131) | (4,019) | 263
Research and development credits |  |  |  |  |  |  |  |  | (2,758) | (2,821) | (1,525)
Change in uncertain tax positions |  |  |  |  |  |  |  |  | 858 | 1,308 | 1,423
Rate change for changes in federal or state law |  |  |  |  |  |  |  |  | 178 | 32,429 | 25
Change in valuation allowance |  |  |  |  |  |  |  |  | (4,225) | (4,169) | 6,283
Expired NOLs and credits |  |  |  |  |  |  |  |  | 3,054 | 0 | 0
Change in derivatives |  |  |  |  |  |  |  |  | 615 | 0 | 0
Other |  |  |  |  |  |  |  |  | 1,435 | 391 | (328)
Income tax expense from continuing operations | $ 37,674 | $ 3,645 | $ 2,242 | $ 1,114 | $ (14,307) | $ 11,864 | $ 22,419 | $ 10,033 | $ 30,009 | $ 44,675 | $ 10,327

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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 the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + 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 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32123-109318 + Details
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