Pension and Other Postretirement Benefit Plans Projected Benefit Obligation and Fair Value of Plan Asset (Details) - USD ($)	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Projected Benefit Obligation:
Projected benefit obligation at beginning of year	$ 74,683,000	$ 65,246,000
Service cost			$ 755,000
Interest cost	323,000	679,000	1,027,000
Amendments/curtailments		(1,049,000)
Benefits paid and administrative expenses	(1,426,000)	(1,329,000)
Actuarial (gain) loss, net	(5,281,000)	5,056,000
Unrealized (gain) loss on foreign exchange	(5,170,000)	6,080,000
Projected benefit obligation at end of year	63,129,000	74,683,000	65,246,000
Fair Value of Plan Assets:
Fair value of plan assets at beginning of year	70,319,000	59,318,000
Increase in plan asset value	(5,268,000)	6,041,000
Contributions by employer	261,000	601,000		$ 0
Unrealized gain (loss) on foreign exchange	(4,847,000)	(5,688,000)
Fair value of plan assets at end of year	59,039,000	70,319,000	$ 59,318,000
Under-funded status of the plan at end of the year	(4,090,000)	(4,364,000)
Accumulated Benefit Obligation	$ 63,129,000	$ 74,683,000