Accounting Policies (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021	Jun. 30, 2022	Mar. 31, 2022	Dec. 31, 2021	Jun. 30, 2021	Mar. 31, 2021	Dec. 31, 2020
Accounting Policies [Abstract]
Financing Receivable, Allowance for Credit Loss	$ 500		$ 500
Financing Receivable, Allowance for Credit Loss, Writeoff	1,500		4,000	$ 2,100
Interest Receivable	900		900				$ 1,200
Financing Receivable, Allowance for Credit Loss [Line Items]
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest	477,298	$ 549,097	477,298	549,097	$ 476,728	$ 502,055	511,024	$ 562,732	$ 548,345	$ 558,157
Interest Receivable	900		900				$ 1,200
Financing Receivable, Allowance for Credit Loss, Writeoff	1,500		4,000	2,100
Financing Receivable, Allowance for Credit Loss	500		500
Accounts and Financing Receivable, Allowance for Credit Loss	1,600		1,600
Foreign Currency Transaction Gain (Loss), before Tax	$ (1,100)	$ (300)	$ 200	$ (4,000)