Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2021	Dec. 31, 2020
Current assets:
Cash and cash equivalents	$ 70,794	$ 139,330
Marketable securities, at fair value	114,396	125,012
Accounts and notes receivable, less allowance for doubtful accounts of $59,271 and $59,906 as of December 31, 2021 and 2020, respectively	293,388	255,474
Inventories and supplies	26,015	31,586
Taxes receivable	8,813	393
Prepaid expenses and other assets	32,976	20,608
Total current assets	546,382	572,403
Property and equipment, net	28,102	26,561
Goodwill	74,755	51,084
Other intangible assets, less accumulated amortization of $27,879 and $23,466 as of December 31, 2021 and 2020, respectively	20,805	18,187
Notes receivable — long–term portion, less allowance for doubtful accounts of $6,312 and $7,895 as of December 31, 2021 and 2020, respectively	29,259	34,417
Deferred compensation funding, at fair value	46,691	46,825
Deferred tax asset	31,535	35,554
Total assets	777,529	785,031
Current liabilities:
Accounts payable	64,419	52,239
Accrued payroll and related taxes	68,664	70,614
Other accrued expenses	26,741	17,797
Deferred compensation liability — short-term	6,991	0
Accrued insurance claims	24,310	21,610
Total current liabilities	191,125	162,260
Accrued insurance claims — long-term	65,084	60,818
Deferred compensation liability — long-term	46,888	46,827
Accrued payroll and related taxes — noncurrent	0	23,302
Lease liability — long-term	11,299	11,363
Other long-term liabilities	10,456	0
Commitments and contingencies (Note 15)
STOCKHOLDERS’ EQUITY:
Common stock, $0.01 par value; 100,000 shares authorized; 76,009 and 75,798 shares issued, and 73,769 and 74,485 shares outstanding as of December 31, 2021 and 2020, respectively	760	758
Additional paid-in capital	294,124	282,206
Retained earnings	183,957	200,893
Accumulated other comprehensive income, net of taxes	4,000	5,563
Common stock in treasury, at cost, 2,240 and 1,313 shares as of December 31, 2021 and 2020, respectively	(30,164)	(8,959)
Total stockholders’ equity	452,677	480,461
Total liabilities and stockholders’ equity	$ 777,529	$ 785,031