Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 64,498	$ 27,329
Marketable securities, at fair value	90,497	90,711
Accounts and notes receivable, less allowance for doubtful accounts of $87,453 and $45,726 as of March 31, 2020 and December 31, 2019, respectively	303,804	340,930
Inventories and supplies	36,938	36,517
Prepaid expenses and other assets	24,819	20,245
Total current assets	520,556	515,732
Property and equipment, net	29,010	28,820
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $20,342 and $19,300 as of March 31, 2020 and December 31, 2019, respectively	21,311	22,353
Notes receivable — long–term portion, less allowance for doubtful accounts of $4,827 and $6,667 as of March 31, 2020 and December 31, 2019, respectively	49,466	46,992
Deferred compensation funding, at fair value	30,008	37,247
Deferred income taxes	30,642	20,364
Total assets	732,077	722,592
Current liabilities:
Accounts payable	60,794	54,418
Accrued payroll, accrued and withheld payroll taxes	29,763	36,413
Other accrued expenses	11,443	16,489
Borrowings under line of credit	50,000	10,000
Income taxes payable	10,555	8,075
Accrued insurance claims	23,729	23,256
Total current liabilities	186,284	148,651
Accrued insurance claims — long-term portion	65,272	64,366
Deferred compensation liability	30,098	37,621
Lease liability — long-term portion	12,244	11,649
Commitments and contingencies (Note 15)
STOCKHOLDERS’ EQUITY:
Common stock, $0.01 par value; 100,000 shares authorized; 75,725 and 75,557 shares issued, and 74,416 and 74,149 shares outstanding as of March 31, 2020 and December 31, 2019, respectively	757	756
Additional paid-in capital	275,447	270,614
Retained earnings	168,404	195,455
Accumulated other comprehensive income, net of taxes	2,386	2,919
Common stock in treasury, at cost, 1,309 and 1,408 shares as of March 31, 2020 and December 31, 2019, respectively	(8,815)	(9,439)
Total stockholders’ equity	438,179	460,305
Total liabilities and stockholders’ equity	$ 732,077	$ 722,592