Allowance Accounts - Activities In Allowance For Credit Losses (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	$ 3,469
Balance at end of period	1,477	$ 3,469
Cumulative Effect, Period of Adoption | Accounting Standards Update 2016-13
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year		700
Balance at end of period			$ 700
Allowance for Credit Losses
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	3,469
Additions (reductions)	(146)	2,684
Write-offs	(1,846)
Adjustments		785
Balance at end of period	1,477	3,469
Allowance for Credit Losses | Robotics
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Additions (reductions)		1,700
Deferred Tax Asset Valuation Allowance
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at beginning of year	19,722	18,631	17,940
Adjustments	(5,675)	1,091	691
Balance at end of period	$ 14,047	$ 19,722	$ 18,631