Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current assets:
Cash and cash equivalents	$ 28,362	$ 26,025
Marketable securities, at fair value	78,508	76,362
Accounts and notes receivable, less allowance for doubtful accounts of $58,630 and $47,209 as of March 31, 2019 and December 31, 2018, respectively	353,106	341,838
Inventories and supplies	40,982	41,443
Prepaid expenses and other assets	24,048	22,468
Total current assets	525,006	508,136
Property and equipment, net	30,077	12,900
Goodwill	51,084	51,084
Other intangible assets, less accumulated amortization of $18,257 and $17,216 as of March 31, 2019 and December 31, 2018, respectively	25,477	26,518
Notes receivable – long–term portion, less allowance for doubtful accounts of $10,000 as of March 31, 2019 and December 31, 2018	39,291	43,043
Deferred compensation funding, at fair value	31,812	29,113
Deferred income taxes	20,177	20,552
Other noncurrent assets	0	1,257
Total assets	722,924	692,603
Current liabilities:
Accounts payable	60,254	61,467
Accrued payroll, accrued and withheld payroll taxes	51,359	35,198
Other accrued expenses	10,740	8,890
Borrowings under line of credit	30,000	30,000
Income taxes payable	1,410	7,140
Accrued insurance claims	21,719	20,696
Total current liabilities	175,482	163,391
Accrued insurance claims — long-term portion	60,680	58,904
Deferred compensation liability	31,909	29,528
Lease liability - long-term portion	12,304
Commitments and contingencies (Note 15)
STOCKHOLDERS’ EQUITY:
Common stock, $.01 par value; 100,000 shares authorized; 75,465 and 75,344 shares issued, and 74,058 and 73,877 shares outstanding as of March 31, 2019 and December 31, 2018, respectively	755	753
Additional paid-in capital	264,936	259,440
Retained earnings	184,592	190,092
Accumulated other comprehensive income, net of taxes	1,574	158
Common stock in treasury, at cost, 1,407 and 1,467 shares as of March 31, 2019 and December 31, 2018, respectively	(9,308)	(9,663)
Total stockholders’ equity	442,549	440,780
Total liabilities and stockholders’ equity	$ 722,924	$ 692,603

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).