Income Taxes - Reconciliation and components of provision for income taxes (Details) - USD ($) $ in Thousands	12 Months Ended
Dec. 31, 2025	Dec. 31, 2024	Dec. 31, 2023
Reconciliation between the statutory federal income tax rate and the effective income tax rate, amount
U.S. federal statutory tax	$ 20,799	$ 24,136	$ 33,735
State and local income taxes, net of federal benefit	(81)	2,137	2,830
Foreign tax effects	3	(6)	2
Nontaxable or nondeductible items:
Partnership income not taxed	(20,063)	(22,517)	(28,349)
Other	9	821	7
Other adjustments	396	38	(89)
Total	$ 1,063	$ 4,609	$ 8,136
Tax Jurisdiction of Domicile [Extensible Enumeration]	country:US	country:US	country:US
Reconciliation between the statutory federal income tax rate and the effective income tax rate, percent
U.S. federal statutory tax (as a percent)	21.00%	21.00%	21.00%
State and local income taxes, net of federal benefit (as a percent)	(0.10%)	1.90%	1.70%
Foreign tax effects (as a percent)
Nontaxable or nondeductible items:
Partnership income not taxed (as a percent)	(20.30%)	(19.60%)	(17.60%)
Other (as a percent)		0.70%
Other adjustments (as a percent)	0.40%		(0.10%)
Effective income tax rate (as a percent)	1.00%	4.00%	5.00%
Effective Income Tax Rate Reconciliation, State and Local Jurisdiction, Contribution Greater than 50 Percent, Tax Effect [Extensible Enumeration]	MASSACHUSETTS, stpr:NH, NEW YORK, TEXAS	MASSACHUSETTS, stpr:NH, NEW YORK, TEXAS	MASSACHUSETTS, stpr:NH, NEW YORK, TEXAS
Current:
Federal	$ (226)	$ 7,452	$ 1,437
State	302	2,515	4,190
Foreign	1	3
Total current	77	9,970	5,627
Deferred:
Federal	656	(5,347)	3,181
State	330	(14)	(672)
Total deferred	986	(5,361)	2,509
Total	$ 1,063	$ 4,609	$ 8,136

Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to partnership income not taxed.

No definition available.