Income taxes - Income Tax Expense (Details) - USD ($)	9 Months Ended	12 Months Ended
	Sep. 30, 2023	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Income Tax Disclosure [Abstract]
Income tax (benefit) expense		$ (14,550,000)	$ 5,606,000	$ (281,071,000)
Effective tax rate	16.30%	21.50%	16.30%	(312.00%)
Current Federal Tax Expense (Benefit)		$ 3,000	$ 2,000	$ (128,000)
Current State and Local Tax Expense (Benefit)		162,000	818,000	267,000
Current Foreign Tax Expense (Benefit)		3,176,000	2,076,000	(7,669,000)
Current Income Tax Expense (Benefit)		3,341,000	2,896,000	(7,530,000)
Deferred Federal Income Tax Expense (Benefit)		(14,018,000)	5,039,000	(205,856,000)
Deferred State and Local Income Tax Expense (Benefit)		(3,828,000)	(2,312,000)	(67,933,000)
Deferred Foreign Income Tax Expense (Benefit)		(45,000)	(17,000)	248,000
Deferred Income Tax Expense (Benefit)		(17,891,000)	2,710,000	(273,541,000)
Unrecognized Tax Benefits, Decrease Resulting from Prior Period Tax Positions		2,526,000	459,000	13,122,000
Stock-based compensation		$ 3,434,000	$ (1,192,000)	$ (5,345,000)
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Percent		(0.80%)	5.20%	1.90%
Effective Income Tax Rate Reconciliation, Nondeductible Expense, Amount		$ 557,000	$ 1,805,000	$ 1,684,000