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Stockholders' equity: Common stock buyback program (Details) - USD ($) $ / shares in Units, $ in Thousands	1 Months Ended	12 Months Ended
	Jun. 30, 2024	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Stockholders' equity:
Authorized amount for common stock repurchases		$ 50,000
Remaining authorized amount for common stock repurchases		22,400
Repurchase of common stock (in shares)	153,322		0	0
Purchase of common stock under buy back program	$ 8,000	$ 7,968
Average share price	$ 51.97

X

- Definition

Amount authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Topic 505
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 4
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X

- Definition

The cash outflow to reacquire common stock during the period.

+ References

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X

- Definition

Amount remaining authorized for purchase of share under share repurchase plan. Includes, but is not limited to, repurchase of stock and unit of ownership.

+ References

No definition available.

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X

- Definition

Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
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- References

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- Definition

Total cost of shares repurchased divided by the total number of shares repurchased.

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