Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Current assets
Cash and cash equivalents	$ 157,961	$ 216,158
Accounts receivable:
Billed receivables	415,090	365,385
Unbilled receivables	328,526	288,331
Allowance for doubtful accounts and unbilled services	(196,484)	(178,819)
Accounts receivable, net	547,132	474,897
Current portion of notes receivable	23,924	31,864
Prepaid expenses and other current assets	59,196	60,252
Total current assets	788,213	783,171
Property and equipment, net of accumulated depreciation	70,982	61,856
Goodwill	1,204,164	1,180,001
Other intangible assets, net of amortization	46,788	52,120
Notes receivable, net of current portion	106,462	104,524
Other assets	43,984	43,696
Total assets	2,260,593	2,225,368
Current liabilities
Accounts payable, accrued expenses and other	108,054	87,320
Accrued compensation	232,291	261,500
Billings in excess of services provided	26,521	29,635
Total current liabilities	366,866	378,455
Long-term debt, net	461,095	365,528
Deferred income taxes	181,293	173,799
Other liabilities	120,410	100,228
Total liabilities	1,129,664	1,018,010
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 — 37,941 (2017) and 42,037 (2016)	379	420
Additional paid-in capital	273,765	416,816
Retained earnings	978,886	941,001
Accumulated other comprehensive loss	(122,101)	(150,879)
Total stockholders' equity	1,130,929	1,207,358
Total liabilities and stockholders' equity	$ 2,260,593	$ 2,225,368