CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Jun. 30, 2024	Dec. 31, 2023
CURRENT ASSETS:
Accounts receivable, allowance for credit losses	$ 39,355	$ 34,441
PROPERTY, EQUIPMENT AND FACILITIES - accumulated depreciation and amortization	142,957	140,161
OTHER ASSETS:
Noncurrent receivables, allowance for credit losses	$ 18,876	$ 19,370
STOCKHOLDERS' EQUITY:
Common stock, par value (in dollars per share)	$ 0	$ 0
Common stock, shares authorized (in shares)	100,000,000	100,000,000
Common stock, shares issued (in shares)	31,490,839	31,359,110
Common stock, shares outstanding (in shares)	31,490,839	31,359,110