Financial Instruments (Narrative) (Details)		12 Months Ended
	Aug. 16, 2023 USD ($)	Dec. 31, 2024 USD ($)	Dec. 31, 2023 USD ($)	Dec. 31, 2022 USD ($)	Nov. 30, 2024 USD ($) derivative	Aug. 31, 2023 USD ($)	Jun. 29, 2023 USD ($)	Jun. 14, 2021 USD ($)
Debt Instrument [Line Items]
Principal payments due on long-term debt in five years		$ 318,500,000
Cash payments of interest		14,700,000	$ 18,700,000	$ 16,000,000.0
Maximum leverage ratio allowed	3.75
Maximum leverage ratio allowed, after significant acquisition	4.25
Number of interest rate derivates held | derivative					2
Total bank debt		318,531,000	456,885,000
Interest rate swaps
Debt Instrument [Line Items]
Cash collateral received		0
Cash collateral pledged		$ 0
Unsecured Debt
Debt Instrument [Line Items]
Line of credit facility, maximum borrowing capacity	$ 800,000,000
Line of Credit
Debt Instrument [Line Items]
Basis spread on variable rate		4.09%
Line of Credit | Interest rate swaps
Debt Instrument [Line Items]
Derivative, notional amount							$ 350,000,000	$ 350,000,000
Derivative, fixed interest rate							0.768%	0.838%
Line of Credit | Unsecured Debt
Debt Instrument [Line Items]
Debt instrument, term	5 years
Basis spread on variable rate		1.50%
Borrowings outstanding		$ 318,000,000
Line of credit facility, remaining borrowing capacity		$ 482,000,000
Interest coverage ratio	3.00	14.90
Maximum leverage ratio allowed		3.50
Debt covenant, maximum annual dividend payout amount		$ 40,000,000
Leverage ratio		0.88
Line of Credit | USD borrowings
Debt Instrument [Line Items]
Total bank debt		$ 225,000,000	446,000,000
Line of Credit | USD borrowings | Interest rate swaps
Debt Instrument [Line Items]
Derivative, notional amount					$ 125,000,000
Derivative, fixed interest rate					3.987%
Line of Credit | EUR borrowings
Debt Instrument [Line Items]
Total bank debt		93,485,000	0
Line of Credit | EUR borrowings | Interest rate swaps
Debt Instrument [Line Items]
Derivative, notional amount					$ 45,000,000
Derivative, fixed interest rate					2.277%
Foreign Bank Debt
Debt Instrument [Line Items]
Total bank debt		46,000	$ 10,885,000
Foreign Bank Debt | Heimbach
Debt Instrument [Line Items]
Total bank debt		$ 100,000				$ 32,700,000