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Income Taxes - Unrecognized Tax Benefits (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Taxes
Unrecognized tax benefits at the beginning of year	$ 14,980,000	$ 14,620,000	$ 14,553,000
Gross increases - prior year tax positions	549,000	360,000	67,000
Unrecognized tax benefits at end of year	15,529,000	14,980,000	14,620,000
Interest and penalties in year-end balance	976,000	427,000	67,000
Interest expense related to uncertain tax positions	$ 549,000	$ 360,000	$ 67,000

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Amount of unrecognized tax benefits.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 740
-SubTopic 10
-Section 45
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-URI http://asc.fasb.org/extlink&oid=123427490&loc=SL37586934-109318

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Amount of expense 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.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
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Amount of increase in unrecognized tax benefits resulting from tax positions taken in prior period tax returns.

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Amount of interest expense accrued for an underpayment of income taxes.

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