Consolidated Statements of Cash Flows - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Cash flows used in operating activities:
Net income	$ 12,684	$ 11,329
Adjustments to reconcile net income to net cash used in operating activities:
Depreciation and amortization	3,720	4,147
Bad debt provision	6,907	2,851
Deferred income tax benefit	43	0
Share-based compensation expense	2,058	2,396
Amortization of premium on marketable securities	533	561
Unrealized (gain) loss on deferred compensation fund investments	(1,502)	4,074
Changes in other long-term liabilities	336	(1,760)
Net loss on disposals of fixed assets	128	173
Changes in operating assets and liabilities:
Accounts and notes receivable	(20,633)	(27,222)
Inventories and supplies	935	1,195
Prepaid expenses and other assets	4,076	(2,462)
Deferred compensation funding	683	3,605
Accounts payable and other accrued expenses	(6,422)	(3,051)
Accrued payroll, accrued and withheld payroll taxes	(21,167)	(24,933)
Income taxes receivable	(1,748)	3,764
Accrued insurance claims	2,366	3,056
Deferred compensation liability	713	(7,905)
Net cash used in operating activities	(16,290)	(30,182)
Cash flows used in investing activities:
Disposals of fixed assets	57	152
Additions to property and equipment	(1,010)	(1,407)
Purchases of marketable securities	0	(1,525)
Sales of marketable securities	210	1,519
Cash paid for acquisitions	0	(114)
Net cash used in investing activities	(743)	(1,375)
Cash flows from (used in) financing activities:
Dividends paid	0	(15,704)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan	0	25
Proceeds from the exercise of stock options	0	410
Purchases of treasury stock	(2,223)	0
Proceeds from short-term borrowings	10,000	10,000
Payments of statutory withholding on net issuance of restricted stock units	(870)	(1,069)
Net cash from (used in) financing activities	6,907	(6,338)
Net change in cash and cash equivalents	(10,126)	(37,895)
Cash and cash equivalents at beginning of the period	26,279	70,794
Cash and cash equivalents at end of the period	$ 16,153	$ 32,899