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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 |  |

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