Consolidated Balance Sheets - USD ($)	Dec. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 139,330,000	$ 27,329,000
Marketable securities, at fair value	125,012,000	90,711,000
Accounts and notes receivable, less allowance for doubtful accounts of $59,906 and $45,726 as of December 31, 2020 and 2019, respectively	255,474,000	340,930,000
Inventories and supplies	31,586,000	36,517,000
Prepaid expenses and other assets	21,001,000	20,245,000
Total current assets	572,403,000	515,732,000
Property and equipment, net	26,561,000	28,820,000
Goodwill	51,084,000	51,084,000
Other intangible assets, less accumulated amortization of $23,466 and $19,300 as of December 31, 2020 and 2019, respectively	18,187,000	22,353,000
Notes receivable — long–term portion, less allowance for doubtful accounts of $7,895 and $6,667 as of December 31, 2020 and 2019, respectively	34,417,000	46,992,000
Deferred compensation funding, at fair value	46,825,000	37,247,000
Deferred income taxes, net	35,554,000	20,364,000
Total assets	785,031,000	722,592,000
Current liabilities:
Accounts payable	52,239,000	54,418,000
Accrued payroll and related taxes	70,614,000	36,413,000
Other accrued expenses	17,797,000	16,489,000
Borrowings under line of credit	0	10,000,000
Income taxes payable	0	8,075,000
Accrued insurance claims	21,610,000	23,256,000
Total current liabilities	162,260,000	148,651,000
Accrued insurance claims — long-term portion	60,818,000	64,366,000
Deferred compensation liability	46,827,000	37,621,000
Accrued payroll and related taxes - noncurrent	23,302,000	0
Lease liability — long-term portion	11,363,000	11,649,000
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $0.01 par value; 100,000 shares authorized; 75,798 and 75,557 shares issued, and 74,485 and 74,149 shares outstanding as of December 31, 2020 and 2019, respectively	758,000	756,000
Additional paid-in capital	282,206,000	270,614,000
Retained earnings	200,893,000	195,455,000
Accumulated other comprehensive income, net of taxes	5,563,000	2,919,000
Common stock in treasury, at cost, 1,313 and 1,408 shares as of December 31, 2020 and 2019, respectively	(8,959,000)	(9,439,000)
Total stockholders’ equity	480,461,000	460,305,000
Total liabilities and stockholders’ equity	$ 785,031,000	$ 722,592,000