Consolidated Balance Sheets - USD ($)	Jun. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 78,109,000	$ 27,329,000
Marketable securities, at fair value	92,318,000	90,711,000
Accounts and notes receivable, less allowance for doubtful accounts of $74,882 and $45,726 as of June 30, 2020 and December 31, 2019, respectively	295,261,000	340,930,000
Inventories and supplies	33,677,000	36,517,000
Prepaid expenses and other assets	24,176,000	20,245,000
Total current assets	523,541,000	515,732,000
Property and equipment, net	28,558,000	28,820,000
Goodwill	51,084,000	51,084,000
Other intangible assets, less accumulated amortization of $21,383 and $19,300 as of June 30, 2020 and December 31, 2019, respectively	20,270,000	22,353,000
Notes receivable — long–term portion, less allowance for doubtful accounts of $9,104 and $6,667 as of June 30, 2020 and December 31, 2019, respectively	41,868,000	46,992,000
Deferred compensation funding, at fair value	37,217,000	37,247,000
Deferred income taxes	34,150,000	20,364,000
Total assets	736,688,000	722,592,000
Current liabilities:
Accounts payable	59,369,000	54,418,000
Accrued payroll, accrued and withheld payroll taxes	50,494,000	36,413,000
Other accrued expenses	13,904,000	16,489,000
Borrowings under line of credit	0	10,000,000
Income taxes payable	20,922,000	8,075,000
Accrued insurance claims	24,806,000	23,256,000
Total current liabilities	169,495,000	148,651,000
Accrued insurance claims — long-term portion	68,212,000	64,366,000
Deferred compensation liability	37,211,000	37,621,000
Lease liability — long-term portion	12,083,000	11,649,000
Commitments and contingencies (Note 15)
STOCKHOLDERS’ EQUITY:
Common stock, $0.01 par value; 100,000 shares authorized; 75,732 and 75,557 shares issued, and 74,421 and 74,149 shares outstanding as of June 30, 2020 and December 31, 2019, respectively	757,000	756,000
Additional paid-in capital	277,482,000	270,614,000
Retained earnings	176,268,000	195,455,000
Accumulated other comprehensive income, net of taxes	4,042,000	2,919,000
Common stock in treasury, at cost, 1,311 and 1,408 shares as of June 30, 2020 and December 31, 2019, respectively	(8,862,000)	(9,439,000)
Total stockholders’ equity	449,687,000	460,305,000
Total liabilities and stockholders’ equity	$ 736,688,000	$ 722,592,000