Consolidated Balance Sheets - USD ($) $ in Thousands	Dec. 31, 2018	Dec. 31, 2017
Current assets
Cash and cash equivalents	$ 312,069	$ 189,961
Accounts receivable:
Billed receivables	437,797	390,996
Unbilled receivables	319,205	312,569
Allowance for doubtful accounts and unbilled services	(202,394)	(180,687)
Accounts receivable, net	554,608	522,878
Current portion of notes receivable	29,228	25,691
Prepaid expenses and other current assets	69,448	55,649
Total current assets	965,353	794,179
Property and equipment, net	84,577	75,075
Goodwill	1,172,316	1,204,803
Other intangible assets, net	34,633	44,150
Notes receivable, net	84,471	98,105
Other assets	37,771	40,929
Total assets	2,379,121	2,257,241
Current liabilities
Accounts payable, accrued expenses and other	104,600	94,873
Accrued compensation	333,536	268,513
Billings in excess of services provided	44,434	46,942
Total current liabilities	482,570	410,328
Long-term debt, net	265,571	396,284
Deferred income taxes	155,088	124,471
Other liabilities	127,067	134,187
Total liabilities	1,030,296	1,065,270
Commitments and contingent liabilities (Note 14)
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 — 38,147 (2018) and 37,729 (2017)	381	377
Additional paid-in capital	299,534	266,035
Retained earnings	1,196,727	1,045,774
Accumulated other comprehensive loss	(147,817)	(120,215)
Total stockholders' equity	1,348,825	1,191,971
Total liabilities and stockholders' equity	$ 2,379,121	$ 2,257,241