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Stockholders' equity: Common stock buyback program (Details) $ in Millions	36 Months Ended
	Dec. 31, 2023 USD ($) shares
Dividends on common stock:
Authorized amount for common stock repurchases	$ 50.0
Remaining authorized amount for common stock repurchases	$ 30.4
Repurchase of common stock (in shares) \| shares	0

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.

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