Operating revenue from Contracts with Customers - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2025	Dec. 31, 2024
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Operating revenue	$ 159,570	$ 185,242
Transaction price allocated to unsatisfied or partially satisfied performance obligations	0	0
Revenue recognized	1,300	3,000
Unamortized contract costs	300	200
Impairment	0	0
Transferred at Point in Time
Revenue, Remaining Performance Obligation, Expected Timing of Satisfaction [Line Items]
Operating revenue	$ 3,400	$ 2,400