CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 40,888	$ 36,667
Accounts receivable, net	572,864	428,536
Prepaid expenses and income taxes	13,606	18,592
Workers' compensation receivable	14,890	12,702
Other current assets	4,351	3,026
Total current assets	646,599	499,523
Property and equipment, net	81,672	57,996
Identifiable intangible assets, net	502,557	352,766
Goodwill	1,420,636	894,095
Other non-current assets	13,126	5,749
Total assets	2,664,590	1,810,129
Current liabilities:
Accounts payable	28,921	6,870
Accrued payroll and contract professional pay	195,698	114,832
Workers’ compensation loss reserves	17,137	14,777
Income taxes payable	8,180	1,229
Other current liabilities	41,481	29,009
Total current liabilities	291,417	166,717
Long-term debt	1,154,154	575,213
Deferred income tax liabilities	71,712	69,436
Other long-term liabilities	17,483	7,372
Total liabilities	1,534,766	818,738
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred Stock, Value, $0.01 par value	0	0
Common stock, $0.01 par value	524	521
Paid-in capital	594,123	566,090
Retained earnings	540,244	428,419
Accumulated other comprehensive loss	(5,067)	(3,639)
Total stockholders’ equity	1,129,824	991,391
Total liabilities and stockholders’ equity	$ 2,664,590	$ 1,810,129