Consolidated Statements of Cash Flows - USD ($) $ in Thousands	6 Months Ended
	Jun. 30, 2022	Jun. 30, 2021
Cash flows from operating activities:
Net income	$ 18,149	$ 34,218
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	7,765	7,302
Bad debt provision	17,024	6,709
Share-based compensation expense	4,768	4,569
Amortization of premium on marketable securities	1,125	1,138
Unrealized loss (gain) on deferred compensation fund investments	10,620	(4,053)
Changes in contingent consideration	(2,050)	0
Net loss on disposals of fixed assets	560	597
Changes in operating assets and liabilities:
Accounts and notes receivable	(58,810)	(23,054)
Inventories and supplies	2,480	3,578
Prepaid expenses and other assets	(508)	(19,972)
Deferred compensation funding	3,751	444
Accounts payable and other accrued expenses	(15,893)	17,827
Accrued payroll, accrued and withheld payroll taxes	(5,523)	(10,088)
Income taxes payable	5,038	2,595
Accrued insurance claims	6,217	2,945
Deferred compensation liability	(15,877)	4,087
Net cash (used in) provided by operating activities	(21,164)	28,842
Cash flows from investing activities:
Disposals of fixed assets	201	84
Additions to property and equipment	(2,580)	(2,093)
Purchases of marketable securities	(2,875)	(15,138)
Sales of marketable securities	9,526	12,031
Cash paid for acquisitions	(114)	(6,000)
Net cash provided by (used in) investing activities	4,158	(11,116)
Cash flows from financing activities:
Dividends paid	(31,499)	(31,034)
Reissuance of treasury stock pursuant to Dividend Reinvestment Plan	51	46
Proceeds from the exercise of stock options	410	1,855
Purchases of treasury stock	0	(1,835)
Proceeds from short-term borrowings	10,000	0
Payments of statutory withholding on net issuance of restricted stock units	(1,069)	(1,501)
Net cash used in financing activities	(22,107)	(32,469)
Net change in cash and cash equivalents	(39,113)	(14,743)
Cash and cash equivalents at beginning of the period	70,794	139,330
Cash and cash equivalents at end of the period	31,681	124,587
Supplemental disclosure of non-cash investing activities
Accrued variable consideration from acquisition of a business	$ 0	$ 5,703