CONDENSED CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
Current assets:
Cash and cash equivalents	$ 44,657	$ 36,667
Accounts receivable, net of allowance	558,040	428,536
Prepaid expenses and income taxes	15,291	18,592
Workers' compensation receivable	15,117	12,702
Other current assets	4,200	3,026
Total current assets	637,305	499,523
Property and equipment, net	83,986	57,996
Identifiable intangible assets, net	521,198	352,766
Goodwill	1,420,012	894,095
Other non-current assets	12,533	5,749
Total assets	2,675,034	1,810,129
Current liabilities:
Accounts payable	26,983	6,870
Accrued payroll and contract professional pay	179,830	114,832
Workers’ compensation loss reserves	17,077	14,777
Income taxes payable	5,180	1,229
Other current liabilities	50,050	29,009
Total current liabilities	279,120	166,717
Long-term debt	1,240,886	575,213
Deferred income tax liabilities	68,755	69,436
Other long-term liabilities	17,531	7,372
Total liabilities	1,606,292	818,738
Commitments and contingencies (Note 7)
Stockholders’ equity:
Preferred Stock, Value, $0.01 par value	0	0
Common stock, $0.01 par value	523	521
Paid-in capital	581,946	566,090
Retained earnings	491,072	428,419
Accumulated other comprehensive loss	(4,799)	(3,639)
Total stockholders’ equity	1,068,742	991,391
Total liabilities and stockholders’ equity	$ 2,675,034	$ 1,810,129