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Stock option and award plan: Incentive award plan, additional information (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2025 | Dec. 31, 2024 | Dec. 31, 2023
Incentive Award Plan, additional information |  |  |
Equity-based compensation expense | $ 26,417 | $ 25,738 | $ 26,924
Total unrecognized compensation cost | $ 60,600 |  |
Weighted-average period to recognize unrecognized compensation cost | 2 years 3 months 18 days |  |
Restricted stock |  |  |
Incentive Award Plan, additional information |  |  |
Equity-based compensation expense | $ 26,417 | 25,738 | 26,924
Income tax benefit related to stock options and restricted stock | 2,412 | 2,469 | 3,307
Capitalized compensation expense related to stock options and restricted stock | 3,521 | 3,100 | 3,541
Intrinsic value of stock options exercised | 52 | 573 | 456
Fair value of shares of restricted stock vested | $ 25,525 | $ 22,489 | $ 30,113

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- Definition Amount of cost not yet recognized for nonvested award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (i) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 718 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d)(2) -Publisher FASB -URI https://asc.fasb.org/1943274/2147480429/718-10-50-2 + Details
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