Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 15,197	$ 9,557
Marketable securities, at fair value	74,704	73,221
Accounts and notes receivable, less allowance for doubtful accounts of $38,630 and $11,985 as of September 30, 2018 and December 31, 2017, respectively	353,484	378,720
Inventories and supplies	41,595	42,393
Prepaid expenses and other assets	23,198	23,515
Total current assets	508,178	527,406
Property and equipment, net	13,067	13,509
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $16,175 and $12,853 as of September 30, 2018 and December 31, 2017, respectively	27,559	30,881
Notes receivable – long–term portion, less allowance for doubtful accounts of $10,000 and $0 as of September 30, 2018 and December 31, 2017, respectively	45,906	15,476
Deferred compensation funding, at fair value	32,946	28,885
Deferred income taxes	7,974	7,498
Other noncurrent assets	1,258	1,264
Total assets	687,972	676,003
Current liabilities:
Accounts payable	75,541	74,463
Accrued payroll, accrued and withheld payroll taxes	52,617	32,139
Other accrued expenses	4,088	4,561
Borrowings under line of credit	9,959	35,382
Income taxes payable	0	15,378
Accrued insurance claims	24,167	22,245
Total current liabilities	166,372	184,168
Accrued insurance claims — long-term portion	68,782	62,454
Deferred compensation liability	33,238	29,429
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 75,256 and 74,960 shares issued, and 73,788 and 73,436 shares outstanding as of September 30, 2018 and December 31, 2017, respectively	753	750
Additional paid-in capital	256,129	244,363
Retained earnings	173,033	163,860
Accumulated other comprehensive (loss) income, net of taxes	(712)	837
Common stock in treasury, at cost, 1,468 and 1,524 shares as of September 30, 2018 and December 31, 2017, respectively	(9,623)	(9,858)
Total stockholders’ equity	419,580	399,952
Total liabilities and stockholders’ equity	$ 687,972	$ 676,003

The aggregate of amounts due from customers or clients, within one year of the balance sheet date (or one operating cycle, if longer), for goods or services that have been delivered or sold in the normal course of business and an amount representing an agreement for an unconditional promise by the maker to pay the entity (holder) a definite sum of money at a future date within one year of the balance sheet, reduced to their estimated net realizable fair value by an allowance established by the entity of the amount it deems uncertain of collection and net of any write-downs taken for collection uncertainty on the part of the holder, respectively.

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- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).