Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 152,044	$ 189,961
Accounts receivable:
Billed receivables	417,085	390,996
Unbilled receivables	367,516	312,569
Allowance for doubtful accounts and unbilled services	(201,013)	(180,687)
Accounts receivable, net	583,588	522,878
Current portion of notes receivable	29,371	25,691
Prepaid expenses and other current assets	50,775	55,649
Total current assets	815,778	794,179
Property and equipment, net	75,586	75,075
Goodwill	1,208,011	1,204,803
Other intangible assets, net	42,390	44,150
Notes receivable, net	91,215	98,105
Other assets	43,472	40,929
Total assets	2,276,452	2,257,241
Current liabilities
Accounts payable, accrued expenses and other	105,966	94,873
Accrued compensation	191,055	268,513
Billings in excess of services provided	46,446	46,942
Total current liabilities	343,467	410,328
Long-term debt, net	441,473	396,284
Deferred income taxes	129,274	124,471
Other liabilities	124,804	134,187
Total liabilities	1,039,018	1,065,270
Commitments and contingent liabilities (Note 10)
Stockholders' equity
Preferred stock, $0.01 par value; shares authorized — 5,000; none outstanding	0	0
Common stock, $0.01 par value; shares authorized — 75,000; shares issued and outstanding — 37,720 (2018) and 37,729 (2017)	377	377
Additional paid-in capital	261,765	266,035
Retained earnings	1,085,061	1,045,774
Accumulated other comprehensive loss	(109,769)	(120,215)
Total stockholders' equity	1,237,434	1,191,971
Total liabilities and stockholders' equity	$ 2,276,452	$ 2,257,241