Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended				9 Months Ended
	Sep. 30, 2021	Mar. 31, 2021	Sep. 30, 2020	Mar. 31, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020
Effective income tax rate	33.00%		31.00%		318.00%	23.00%
Valuation allowances against deferred tax assets	$ 11,600				$ 11,600		$ 7,200
Net deferred tax liability	23,400				23,400		$ 33,300
Income tax expense (benefit)	$ (2,638)		$ (1,311)		$ (4,006)	$ (3,858)
Cares Act [Member]
Reduction to income taxes payable				$ (1,300)
Reduction to deferred tax assets				$ (1,300)
Correction In Calculation Of Valuation Allowance And Uncertain Tax Position [Member]
Income tax expense (benefit)		$ (2,100)