Income Taxes (Narrative) (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Dec. 31, 2020	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Income tax expense (benefit)	$ (152)	$ (217)	$ 2,809	$ (297)
Effective income tax rate percent	0.64%		3.77%
Income tax benefit discrete items	$ 2,400		$ 1,900
Income tax expense before discrete items	$ 2,200		$ 4,700
Effective income tax rate excluding discrete items percent	9.23%		6.31%
Unrecognized tax benefits	$ 8,000		$ 8,000			$ 9,200
Additions for tax positions related to current year	$ 1,400		$ 1,200
Minimum | Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate percent					6.00%
Maximum | Forecast
Operating Loss Carryforwards [Line Items]
Effective income tax rate percent					7.00%