Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Thousands	Dec. 31, 2023	Dec. 31, 2022
Current assets:
Allowance for uncollectible accounts	$ 6,551	$ 5,753
Capitalization:
Common stock, par value (usd per share)	$ 0.001	$ 0.001
Common stock, shares authorized (in shares)	70,000,000	70,000,000
Common stock, shares issued (in shares)	32,023,004	30,801,912
Common stock, shares outstanding (in shares)	32,023,004	30,801,912