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Income Taxes - Computation of Income Tax Expense (Benefit) (Details) - USD ($) $ in Thousands | 3 Months Ended | 12 Months Ended
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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 Tax Disclosure [Abstract] |  |  |  |  |  |  |  |  |  |  |
Income before income tax expense (benefit) |  |  |  |  |  |  |  |  | $ 161,413 | $ 67,242 | $ 259,803
Tax at federal statutory tax rate |  |  |  |  |  |  |  |  | 33,897 | 14,121 | 54,559
S- corporation exclusion |  |  |  |  |  |  |  |  |  | (4,875) | (39,539)
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 4,838 | 3,223 | 3,865
Change in tax status |  |  |  |  |  |  |  |  | 3,897 | (93,878) |
Change in valuation allowance |  |  |  |  |  |  |  |  | 6,850 | 4,502 | (2,215)
Change in uncertain tax positions |  |  |  |  |  |  |  |  | 883 | 4,118 | 629
Foreign tax rate differential |  |  |  |  |  |  |  |  | (128) | 4,886 | 4,168
Foreign tax credits |  |  |  |  |  |  |  |  | (47) | (1,313) |
Transaction costs |  |  |  |  |  |  |  |  | 61 | 1,052 |
Noncontrolling interests |  |  |  |  |  |  |  |  | (4,280) | (2,282) | (3,599)
Federal research credits |  |  |  |  |  |  |  |  | (2,206) |  |
Other, net |  |  |  |  |  |  |  |  | (1,273) | 560 | 2,499
Total income tax expense (benefit) | $ 9,500 | $ 16,017 | $ 11,891 | $ 5,084 | $ (2,823) | $ (15,453) | $ (53,496) | $ 1,886 | $ 42,492 | $ (69,886) | $ 20,367
Tax at federal statutory tax rate |  |  |  |  |  |  |  |  | 21.00% | 21.00% | 21.00%
S- corporation exclusion |  |  |  |  |  |  |  |  | 0.00% | (7.00%) | (15.00%)
State taxes, net of federal tax benefit |  |  |  |  |  |  |  |  | 3.00% | 5.00% | 1.00%
Change in tax status |  |  |  |  |  |  |  |  | 2.40% | (140.00%) |
Change in valuation allowance |  |  |  |  |  |  |  |  | 4.20% | 7.00% | (1.00%)
Change in uncertain tax positions |  |  |  |  |  |  |  |  | 0.60% | 6.00% | 0.00%
Foreign tax rate differential |  |  |  |  |  |  |  |  | (0.10%) | 7.00% | 2.00%
Foreign tax credits |  |  |  |  |  |  |  |  | (0.00%) | (2.00%) |
Transaction costs |  |  |  |  |  |  |  |  | 0.00% | 1.00% |
Noncontrolling interests |  |  |  |  |  |  |  |  | (2.60%) | (3.00%) | (1.00%)
Federal research credits |  |  |  |  |  |  |  |  | (1.40%) |  |
Other, net |  |  |  |  |  |  |  |  | (0.80%) | 1.00% | 1.00%
Total income tax expense (benefit) |  |  |  |  |  |  |  |  | 26.30% | (103.90%) | 8.00%

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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 state and local income tax expense (benefit). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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 income tax contingencies. Including, but not limited to, domestic tax contingency, foreign tax contingency, state and local tax contingency, and other contingencies. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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 foreign tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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- 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 research tax credit. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -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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