Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
Current assets:
Cash and cash equivalents	$ 48,230	$ 23,853
Marketable securities, at fair value	68,260	67,730
Accounts and notes receivable, less allowance for doubtful accounts of $7,698 as of March 31, 2017 and $6,911 as of December 31, 2016	281,113	271,276
Inventories and supplies	37,294	37,800
Prepaid expenses and other assets	16,824	13,965
Total current assets	451,721	414,624
Property and equipment, net	13,397	13,455
Goodwill	44,438	44,438
Other intangible assets, less accumulated amortization of $15,279 as of March 31, 2017 and $14,672 as of December 31, 2016	13,802	14,409
Notes receivable — long term portion	7,056	7,531
Deferred compensation funding, at fair value	25,082	24,119
Deferred income taxes	9,564	9,822
Other noncurrent assets	48	48
Total Assets	565,108	528,446
Current liabilities:
Accounts payable	47,952	42,912
Accrued payroll, accrued and withheld payroll taxes	34,334	22,303
Other accrued expenses	3,118	4,397
Income taxes payable	8,403	7,686
Accrued insurance claims	23,857	23,573
Total current liabilities	117,664	100,871
Accrued insurance claims — long term portion	64,581	64,080
Deferred compensation liability	26,386	24,653
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 74,423 and 74,204 shares issued, and 72,882 and 72,601 shares outstanding as of March 31, 2017 and December 31, 2016, respectively	744	742
Additional paid-in capital	226,075	217,664
Retained earnings	139,333	130,940
Accumulated other comprehensive income (loss), net of taxes	160	(319)
Common stock in treasury, at cost, 1,541 shares as of March 31, 2017 and 1,603 shares as of December 31, 2016	(9,835)	(10,185)
Total stockholders’ equity	356,477	338,842
TOTAL LIABILITIES AND STOCKHOLDERS’ EQUITY	$ 565,108	$ 528,446