Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2015	Dec. 31, 2014
Current assets
Cash and cash equivalents	$ 149,760	$ 283,680
Accounts receivable:
Billed receivables	405,000	381,464
Unbilled receivables	280,538	248,462
Allowance for doubtful accounts and unbilled services	(185,754)	(144,825)
Accounts receivable, net	499,784	485,101
Current portion of notes receivable	36,115	27,208
Prepaid expenses and other current assets	55,966	60,852
Total current assets	741,625	856,841
Property and equipment, net of accumulated depreciation	74,760	82,163
Goodwill	1,198,298	1,211,689
Other intangible assets, net of amortization	63,935	77,034
Notes receivable, net of current portion	106,882	122,149
Other assets	43,518	41,723
Total assets	2,229,018	2,391,599
Current liabilities
Accounts payable, accrued expenses and other	89,845	99,494
Accrued compensation	227,783	220,959
Current portion of long-term debt		11,000
Billings in excess of services provided	29,449	35,639
Total current liabilities	347,077	367,092
Long-term debt, net	494,772	688,404
Deferred income taxes	139,787	134,600
Other liabilities	99,779	98,757
Total liabilities	$ 1,081,415	$ 1,288,853
Commitments and contingent liabilities (note 13)
Stockholders' equity
Preferred stock, $0.01 par value; shares authorized — 5,000; none outstanding
Common stock, $0.01 par value; shares authorized — 75,000; shares issued and outstanding — 41,234 (2015) and 41,181 (2014)	$ 412	$ 412
Additional paid-in capital	400,705	393,174
Retained earnings	855,481	789,428
Accumulated other comprehensive loss	(108,995)	(80,268)
Total stockholders' equity	1,147,603	1,102,746
Total liabilities and stockholders' equity	$ 2,229,018	$ 2,391,599

Sum of the carrying values as of the balance sheet date of obligations incurred through that date and due within one year (or the operating cycle, if longer), including liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received, taxes, interest, rent and utilities, accrued salaries and bonuses, payroll taxes and fringe benefits.

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- Definition

Amounts due from customers or clients, within one year of the balance sheet date (or the normal operating cycle, whichever is longer) for goods or services (including trade receivables) that have been delivered or sold in the normal course of business.