Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 7,058	$ 23,853
Marketable securities, at fair value	70,082	67,730
Accounts and notes receivable, less allowance for doubtful accounts of $7,895 as of June 30, 2017 and $6,911 as of December 31, 2016	338,368	271,276
Inventories and supplies	40,621	37,800
Prepaid expenses and other assets	20,054	13,965
Total current assets	476,183	414,624
Property and equipment, net	13,399	13,455
Goodwill	50,473	44,438
Other intangible assets, less accumulated amortization of $10,651 as of June 30, 2017 and $14,672 as of December 31, 2016	31,330	14,409
Notes receivable — long term portion	7,526	7,531
Deferred compensation funding, at fair value	26,326	24,119
Deferred income taxes	9,240	9,822
Other noncurrent assets	1,269	48
Total Assets	615,746	528,446
Current liabilities:
Accounts payable	69,204	42,912
Accrued payroll, accrued and withheld payroll taxes	21,784	22,303
Other accrued expenses	3,319	4,397
Borrowings under line of credit	16,182	0
Income taxes payable	12,471	7,686
Accrued insurance claims	23,975	23,573
Total current liabilities	146,935	100,871
Accrued insurance claims — long term portion	66,077	64,080
Deferred compensation liability	26,657	24,653
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 74,611 and 74,204 shares issued, and 73,076 and 72,601 shares outstanding as of June 30, 2017 and December 31, 2016, respectively	746	742
Additional paid-in capital	236,275	217,664
Retained earnings	148,134	130,940
Accumulated other comprehensive income (loss), net of taxes	762	(319)
Common stock in treasury, at cost, 1,535 shares as of June 30, 2017 and 1,603 shares as of December 31, 2016	(9,840)	(10,185)
Total stockholders’ equity	376,077	338,842
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 615,746	$ 528,446