Income Taxes Unrecognized Benefit (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
Balance at beginning of year	$ 2,517	$ 2,726	$ 2,550
Current period tax positions	95	292	593
Lapse of statute of limitations	(461)	(501)	(417)
Balance at end of year	2,151	2,517	$ 2,726
Lapse of statute of limitations, approximate reversal next fiscal year	513
Unrecognized tax benefits that would impact effective tax rate	468
Interest and penalties in income tax expense related to unrecognized tax positions	(17)	22
Income tax penalties and interest accrued	$ 680	$ 697