Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 16,156	$ 26,025
Marketable securities, at fair value	79,533	76,362
Accounts and notes receivable, less allowance for doubtful accounts of $43,419 and $47,209 as of June 30, 2019 and December 31, 2018, respectively	346,765	341,838
Inventories and supplies	39,977	41,443
Prepaid expenses and other assets	26,572	22,468
Total current assets	509,003	508,136
Property and equipment, net	29,603	12,900
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $19,299 and $17,216 as of June 30, 2019 and December 31, 2018, respectively	24,435	26,518
Notes receivable – long–term portion, less allowance for doubtful accounts of $10,000 as of June 30, 2019 and December 31, 2018	41,956	43,043
Deferred compensation funding, at fair value	34,065	29,113
Deferred income taxes	19,985	20,552
Other noncurrent assets	0	1,257
Total assets	710,131	692,603
Current liabilities:
Accounts payable	59,289	61,467
Accrued payroll, accrued and withheld payroll taxes	30,217	35,198
Other accrued expenses	9,500	8,890
Borrowings under line of credit	30,000	30,000
Income taxes payable	0	7,140
Accrued insurance claims	22,385	20,696
Total current liabilities	151,391	163,391
Accrued insurance claims — long-term portion	62,815	58,904
Deferred compensation liability	34,193	29,528
Lease liability - long-term portion	12,084	0
Commitments and contingencies (Note 15)
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 75,519 and 75,344 shares issued, and 74,112 and 73,877 shares outstanding as of June 30, 2019 and December 31, 2018, respectively	755	753
Additional paid-in capital	267,853	259,440
Retained earnings	188,025	190,092
Accumulated other comprehensive income, net of taxes	2,365	158
Common stock in treasury, at cost, 1,407 and 1,467 shares as of June 30, 2019 and December 31, 2018, respectively	(9,350)	(9,663)
Total stockholders’ equity	449,648	440,780
Total liabilities and stockholders’ equity	$ 710,131	$ 692,603