Valuation And Qualifying Accounts (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Allowance For Doubtful Accounts [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	$ 1,382	$ 1,519	$ 1,048
Increase	50	386	1,526
Decrease	263	523	1,055
Balance at end of year	1,169	1,382	1,519
Tax Valuation Allowance [Member]
Valuation and Qualifying Accounts Disclosure [Line Items]
Balance at beginning of year	47,056	33,946	6,720
Increase		13,110	27,226
Decrease	6,162
Balance at end of year	$ 40,894	$ 47,056	$ 33,946