Financial Instruments (Narrative) (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended		9 Months Ended
	Oct. 31, 2018	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020	Dec. 31, 2020	Dec. 31, 2017
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Unrealized gain (loss) on derivatives, net of tax		$ 214	$ 447	$ 1,796	$ (3,911)
Interest rate swap expiration				2018-10
Interest Rate Swap [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Derivative Notional Amount		$ 131,300		$ 131,300		$ 136,900	$ 155,300
Fixed interest rate		2.928%		2.928%			1.4935%
Unrealized gain (loss) on interest rate swap				$ 3,000
Unrealized gain (loss) on derivatives, net of tax				2,200
Gain on contract termination	$ 3,500
Forward Currency Exchange [Member]
Fair Value Off Balance Sheet Risks Disclosure Information [Line Items]
Derivative Notional Amount		$ 10,500		10,500
Unrealized gain (loss) on interest rate swap				$ (400)