Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 11,005	$ 23,853
Marketable securities, at fair value	70,384	67,730
Accounts and notes receivable, less allowance for doubtful accounts of $9,795 as of September 30, 2017 and $6,911 as of December 31, 2016	367,009	271,276
Inventories and supplies	41,516	37,800
Prepaid expenses and other assets	25,628	13,965
Total current assets	515,542	414,624
Property and equipment, net	13,499	13,455
Goodwill	51,084	44,438
Other intangible assets, less accumulated amortization of $11,659 as of September 30, 2017 and $14,672 as of December 31, 2016	32,075	14,409
Notes receivable — long term portion	11,495	7,531
Deferred compensation funding, at fair value	27,387	24,119
Deferred income taxes	9,196	9,822
Other noncurrent assets	1,264	48
Total Assets	661,542	528,446
Current liabilities:
Accounts payable	62,323	42,912
Accrued payroll, accrued and withheld payroll taxes	48,786	22,303
Other accrued expenses	3,665	4,397
Borrowings under line of credit	25,000	0
Income taxes payable	10,781	7,686
Accrued insurance claims	24,827	23,573
Total current liabilities	175,382	100,871
Accrued insurance claims — long term portion	67,818	64,080
Deferred compensation liability	27,886	24,653
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 74,791 and 74,204 shares issued, and 73,265 and 72,601 shares outstanding as of September 30, 2017 and December 31, 2016, respectively	748	742
Additional paid-in capital	241,008	217,664
Retained earnings	157,678	130,940
Accumulated other comprehensive income (loss), net of taxes	844	(319)
Common stock in treasury, at cost, 1,525 shares as of September 30, 2017 and 1,603 shares as of December 31, 2016	(9,822)	(10,185)
Total stockholders’ equity	390,456	338,842
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 661,542	$ 528,446