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Goodwill and intangible assets - Summary of Change in Goodwill and Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended		12 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023	Dec. 31, 2023
Goodwill
Beginning balance at January 1,			$ 47,739	$ 47,739	$ 47,739
Additions to goodwill			0		0
Ending balance	$ 47,739		47,739		47,739
Intangible assets
Beginning balance at January 1,			26,015	32,932	32,932
Additions to intangible assets			400		0
Amortization	(1,600)	$ (1,700)	(4,827)	$ (5,188)	(6,917)
Ending balance	$ 21,588		$ 21,588		$ 26,015

X

- Definition

The aggregate expense charged against earnings to allocate the cost of intangible assets (nonphysical assets not used in production) in a systematic and rational manner to the periods expected to benefit from such assets. As a noncash expense, this element is added back to net income when calculating cash provided by or used in operations using the indirect method.

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Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

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Amount of increase in assets, excluding financial assets, lacking physical substance with a definite life, from an acquisition.

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Amount, after accumulated impairment loss, of asset representing future economic benefit arising from other asset acquired in business combination or from joint venture formation or both, that is not individually identified and separately recognized.

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