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Income Taxes (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Examination [Abstract]
Deferred tax assets, related to revaluation and acquisition of redeemable non-controlling interests	$ 1,200
Adjustment to deferred tax assets	1,400
Accrued interest and penalties associated with any unrecognized tax benefits	0	$ 0	$ 0
Interest expense recognized	0	$ 0	$ 0
Federal [Member]
Income Tax Examination [Abstract]
Tax payable included in accrued liabilities	$ 5,700
Periods open for examination	2017 2018 2019
State [Member]
Income Tax Examination [Abstract]
Tax receivable included in other current assets	$ 700
Periods open for examination	2016 2017 2018 2019

X

- Definition

Carrying amount as of the balance sheet date of the unpaid sum of the known and estimated amounts payable to satisfy all currently due domestic and foreign income tax obligations.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 944
-SubTopic 210
-Section S99
-Paragraph 1
-Subparagraph (SX 210.7-03(a)(15)(b)(1))
-URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910

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-URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878

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Amount after allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences and other tax receivables expected to be realized or consumed within one year or operating cycle, if longer.

+ References

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Tax year being audited in the income tax examination, in CCYY format.

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Amount of income tax expense (benefit) from continuing operations attributable to an adjustment of a deferred tax liability or asset for enacted changes in tax laws or rates or a change in the tax status of the entity.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 50
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- Definition

Amount accrued for interest on an underpayment of income taxes and penalties related to a tax position claimed or expected to be claimed in the tax return.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
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Amount of interest expense for an underpayment of income taxes.

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
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Value of deferred tax assets related to revaluation of redeemable non-controlling interests and acquisitions of non-controlling interests.

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