Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 27,329	$ 26,025
Marketable securities, at fair value	90,711	76,362
Accounts and notes receivable, less allowance for doubtful accounts of $45,726 and $47,209 as of December 31, 2019 and 2018, respectively	340,930	341,838
Inventories and supplies	36,517	41,443
Prepaid expenses and other assets	20,245	22,468
Total current assets	515,732	508,136
Property and equipment, net	28,820	12,900
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $19,300 and $17,216 as of December 31, 2019 and 2018, respectively	22,353	26,518
Notes receivable – long–term portion, less allowance for doubtful accounts of $6,667 and $10,000 as of December 31, 2019 and 2018, respectively	46,992	43,043
Deferred compensation funding, at fair value	37,247	29,113
Deferred income taxes	20,364	20,552
Other noncurrent assets	0	1,257
Total assets	722,592	692,603
Current liabilities:
Accounts payable	54,418	61,467
Accrued payroll, accrued and withheld payroll taxes	36,413	35,198
Other accrued expenses	16,489	8,890
Borrowings under line of credit	10,000	30,000
Income taxes payable	8,075	7,140
Accrued insurance claims	23,256	20,696
Total current liabilities	148,651	163,391
Accrued insurance claims — long-term portion	64,366	58,904
Deferred compensation liability	37,621	29,528
Lease liability — long-term portion	11,649
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common Stock, $0.01 par value; 100,000 shares authorized; 75,557 and 75,344 shares issued, and 74,149 and 73,877 shares outstanding as of December 31, 2019 and 2018, respectively	756	753
Additional paid-in capital	270,614	259,440
Retained earnings	195,455	190,092
Accumulated other comprehensive income, net of taxes	2,919	158
Common Stock in treasury, at cost, 1,408 shares and 1,467 shares as of December 31, 2019 and 2018, respectively	(9,439)	(9,663)
Total stockholders’ equity	460,305	440,780
Total liabilities and stockholders’ equity	$ 722,592	$ 692,603