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Financial Instruments (Narrative) (Details) |  |  | 3 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Mar. 31, 2024 USD ($) | Aug. 16, 2023 USD ($) | Mar. 31, 2024 USD ($) | Mar. 18, 2024 | Dec. 31, 2023 USD ($) | Aug. 31, 2023 USD ($) | Jun. 29, 2023 USD ($) | Dec. 31, 2021 USD ($)
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Maximum leverage ratio allowed | 3.50 | 3.75 | 3.50 |  |  |  |  |
Maximum leverage ratio allowed, after significant acquisition |  | 4.25 |  |  |  |  |  |
Minimum interest coverage ratio required |  | 3.00 |  |  |  |  |  |
Leverage ratio | 1.17 |  | 1.17 |  |  |  |  |
Interest coverage ratio | 14.38 |  | 14.38 |  |  |  |  |
Long-term debt | $ 439,134,000 |  | $ 439,134,000 |  | $ 456,885,000 |  |  |
Current maturities of long-term debt | 4,445,000 |  | 4,445,000 |  | 4,218,000 |  |  |
Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | 429,000,000 |  | 429,000,000 |  | 446,000,000 |  |  |
Line of Credit | Interest rate swaps |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Derivative, notional amount | $ 350,000,000 |  | $ 350,000,000 |  |  |  | $ 350,000,000 | $ 350,000,000
Derivative, fixed interest rate |  |  |  | 5.33% |  |  | 0.8828% |
All-in interest SOFR rate | 2.51% |  | 2.51% |  |  |  |  |
Foreign bank debt |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | $ 10,134,000 |  | $ 10,134,000 |  | 10,885,000 |  |  |
Foreign bank debt | Heimbach |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Long-term debt | 10,100,000 |  | 10,100,000 |  | 10,900,000 | $ 32,700,000 |  |
Current maturities of long-term debt | 4,400,000 |  | 4,400,000 |  | $ 4,200,000 |  |  |
Unsecured Debt | Line of Credit |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Line of credit facility, maximum borrowing capacity |  | $ 800,000,000 |  |  |  |  |  |
Debt instrument, term |  | 5 years |  |  |  |  |  |
Borrowings outstanding | 429,000,000 |  | 429,000,000 |  |  |  |  |
Line of credit facility, remaining borrowing capacity | $ 371,000,000 |  | 371,000,000 |  |  |  |  |
Debt covenant, maximum annual dividend payout amount |  |  | $ 40,000,000 |  |  |  |  |
Unsecured Debt | Line of Credit | SOFR |  |  |  |  |  |  |  |
Debt Instrument [Line Items] |  |  |  |  |  |  |  |
Total spread | 1.625% |  |  |  |  |  |  |

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- Definition Line items represent financial concepts included in a table. 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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(22)) -SubTopic 10 -Topic 210 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 944 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(16)(a)(2)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479440/944-210-S99-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 942 -SubTopic 210 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147479853/942-210-S99-1 + Details
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