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Common stock buyback program: (Details) - USD ($) $ / shares in Units, $ in Thousands | 1 Months Ended | 3 Months Ended | 6 Months Ended |
--- | --- | --- | --- | ---
Jul. 31, 2025 | Jun. 30, 2024 | Jun. 30, 2025 | Jun. 30, 2025 | Jun. 30, 2024 | Aug. 06, 2025
Common stock buyback program: |  |  |  |  |  |
Purchase of common stock under buyback program (in shares) |  | 153,322 | 229,507 |  |  |
Purchase of common stock under buy back program |  | $ 8,000 | $ 11,500 | $ 11,517 | $ 7,968 |
Average share price |  | $ 51.97 | $ 50.18 |  |  |
Subsequent Events |  |  |  |  |  |
Common stock buyback program: |  |  |  |  |  |
Purchase of common stock under buyback program (in shares) | 63,487 |  |  |  |  |
Purchase of common stock under buy back program | $ 3,100 |  |  |  |  |
Average share price | $ 48.13 |  |  |  |  |
Increase in authorized amount |  |  |  |  |  | $ 100,000
Remaining authorized amount for common stock repurchases | $ 107,900 |  |  |  |  |

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