Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Thousands	Mar. 31, 2016	Dec. 31, 2015
Current assets
Cash and cash equivalents	$ 114,451	$ 149,760
Accounts receivable:
Billed receivables	420,824	405,000
Unbilled receivables	329,933	280,538
Allowance for doubtful accounts and unbilled services	(197,527)	(185,754)
Accounts receivable, net	553,230	499,784
Current portion of notes receivable	31,474	36,115
Prepaid expenses and other current assets	45,196	55,966
Total current assets	744,351	741,625
Property and equipment, net of accumulated depreciation	71,263	74,760
Goodwill	1,198,070	1,198,298
Other intangible assets, net of amortization	61,193	63,935
Notes receivable, net of current portion	108,095	106,882
Other assets	42,072	43,518
Total assets	2,225,044	2,229,018
Current liabilities
Accounts payable, accrued expenses and other	95,606	89,845
Accrued compensation	157,687	227,783
Billings in excess of services provided	34,226	29,449
Total current liabilities	287,519	347,077
Long-term debt, net	501,961	494,772
Deferred income taxes	150,557	139,787
Other liabilities	103,761	99,779
Total liabilities	$ 1,043,798	$ 1,081,415
Commitments and contingent liabilities (note 10)
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 — 41,385 (2016) and 41,234 (2015)	$ 414	$ 412
Additional paid-in capital	404,523	400,705
Retained earnings	885,662	855,481
Accumulated other comprehensive loss	(109,353)	(108,995)
Total stockholders' equity	1,181,246	1,147,603
Total liabilities and stockholders' equity	$ 2,225,044	$ 2,229,018