Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 13,155	$ 9,557
Marketable securities, at fair value	74,928	73,221
Accounts and notes receivable, less allowance for doubtful accounts of $49,709 and $11,985 as of June 30, 2018 and December 31, 2017, respectively	343,665	378,720
Inventories and supplies	41,424	42,393
Prepaid expenses and other assets	27,625	23,515
Total current assets	500,797	527,406
Property and equipment, net	13,254	13,509
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $15,084 and $12,853 as of June 30, 2018 and December 31, 2017, respectively	28,650	30,881
Notes receivable — long-term portion	37,386	15,476
Deferred compensation funding, at fair value	30,697	28,885
Deferred income taxes	7,753	7,498
Other noncurrent assets	1,257	1,264
Total assets	670,878	676,003
Current liabilities:
Accounts payable	69,269	74,463
Accrued payroll, accrued and withheld payroll taxes	27,423	32,139
Other accrued expenses	3,495	4,561
Borrowings under line of credit	40,505	35,382
Income taxes payable	0	15,378
Accrued insurance claims	23,702	22,245
Total current liabilities	164,394	184,168
Accrued insurance claims — long-term portion	67,459	62,454
Deferred compensation liability	30,891	29,429
Commitments and contingencies
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 75,200 and 74,960 shares issued, and 73,733 and 73,436 shares outstanding as of June 30, 2018 and December 31, 2017, respectively	752	750
Additional paid-in capital	255,894	244,363
Retained earnings	161,269	163,860
Accumulated other comprehensive (loss) income, net of taxes	(204)	837
Common stock in treasury, at cost, 1,467 and 1,524 shares as of June 30, 2018 and December 31, 2017, respectively	(9,577)	(9,858)
Total stockholders’ equity	408,134	399,952
Total liabilities and stockholders’ equity	$ 670,878	$ 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.

Name:	us-gaap_AccountsNotesAndLoansReceivableNetCurrent
Namespace Prefix:	us-gaap_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- 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).