Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 9,557	$ 23,853
Marketable securities, at fair value	73,221	67,730
Accounts and notes receivable, less allowance for doubtful accounts of $11,985 and $6,911 as of December 31, 2017 and 2016, respectively	378,720	271,276
Inventories and supplies	42,393	37,800
Prepaid expenses and other assets	23,515	13,965
Total current assets	527,406	414,624
Property and equipment, net	13,509	13,455
Goodwill	51,084	44,438
Other intangible assets, less accumulated amortization of $12,853 and $14,672 as of December 31, 2017 and 2016, respectively	30,881	14,409
Notes receivable — long-term portion	15,476	7,531
Deferred compensation funding, at fair value	28,885	24,119
Deferred income taxes	7,498	9,822
Other noncurrent assets	1,264	48
Total Assets	676,003	528,446
Current liabilities:
Accounts payable	74,463	42,912
Accrued payroll, accrued and withheld payroll taxes	32,139	22,303
Other accrued expenses	4,561	4,397
Borrowings under line of credit	35,382	0
Income taxes payable	15,378	7,686
Accrued insurance claims	22,245	23,573
Total current liabilities	184,168	100,871
Accrued insurance claims — long-term portion	62,454	64,080
Deferred compensation liability	29,429	24,653
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common Stock, $.01 par value; 100,000 shares authorized; 74,960 and 74,204 shares issued, and 73,436 and 72,601 shares outstanding as of December 31, 2017 and 2016, respectively	750	742
Additional paid-in capital	244,363	217,664
Retained earnings	163,860	130,940
Accumulated other comprehensive income (loss), net of taxes	837	(319)
Common Stock in treasury, at cost, 1,524 shares and 1,603 shares as of December 31, 2017 and 2016, respectively	(9,858)	(10,185)
Total stockholders’ equity	399,952	338,842
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 676,003	$ 528,446