Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 26,025	$ 9,557
Marketable securities, at fair value	76,362	73,221
Accounts and notes receivable, less allowance for doubtful accounts of $47,209 and $11,985 as of December 31, 2018 and 2017, respectively	341,838	378,720
Inventories and supplies	41,443	42,393
Prepaid expenses and other assets	22,468	23,515
Total current assets	508,136	527,406
Property and equipment, net	12,900	13,509
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $17,216 and $12,853 as of December 31, 2018 and 2017, respectively	26,518	30,881
Notes receivable – long–term portion, less allowance for doubtful accounts of $10,000 and $0 as of December 31, 2018 and 2017, respectively	43,043	15,476
Deferred compensation funding, at fair value	29,113	28,885
Deferred income taxes	20,552	7,498
Other noncurrent assets	1,257	1,264
Total assets	692,603	676,003
Current liabilities:
Accounts payable	61,467	74,463
Accrued payroll, accrued and withheld payroll taxes	35,198	32,139
Other accrued expenses	8,890	4,561
Borrowings under line of credit	30,000	35,382
Income taxes payable	7,140	15,378
Accrued insurance claims	20,696	22,245
Total current liabilities	163,391	184,168
Accrued insurance claims — long-term portion	58,904	62,454
Deferred compensation liability	29,528	29,429
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common Stock, $.01 par value; 100,000 shares authorized; 75,344 and 74,960 shares issued, and 73,877 and 73,436 shares outstanding as of December 31, 2018 and 2017, respectively	753	750
Additional paid-in capital	259,440	244,363
Retained earnings	190,092	163,860
Accumulated other comprehensive income, net of taxes	158	837
Common Stock in treasury, at cost, 1,467 shares and 1,524 shares as of December 31, 2018 and 2017, respectively	(9,663)	(9,858)
Total stockholders’ equity	440,780	399,952
Total liabilities and stockholders' equity	$ 692,603	$ 676,003