Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Current assets:
Cash and cash equivalents	$ 58,419	$ 82,985
Accounts receivable, net of allowances of $8,511 and $3,332 at September 30, 2020 and December 31, 2019, respectively	352,746	352,685
Accounts receivable, subcontractor	56,300	72,714
Prepaid expenses	15,647	11,669
Other current assets	30,591	40,446
Total current assets	513,703	560,499
Restricted cash, cash equivalents and investments	60,898	62,170
Fixed assets, net of accumulated depreciation of $153,390 and $132,900 at September 30, 2020 and December 31, 2019, respectively	112,752	104,832
Operating lease right-of-use assets	81,082	89,866
Other assets	125,831	120,254
Goodwill	869,941	595,551
Intangible assets, net of accumulated amortization of $199,488 and $151,417 at September 30, 2020 and December 31, 2019, respectively	580,658	398,474
Total assets	2,344,865	1,931,646
Current liabilities:
Accounts payable and accrued expenses	152,935	156,140
Accrued compensation and benefits	184,736	170,932
Current portion of notes payable	9,375	0
Current portion of operating lease liabilities	15,338	13,943
Deferred revenue	11,900	11,788
Other current liabilities	11,884	25,302
Total current liabilities	386,168	378,105
Revolving credit facility	40,000	0
Notes payable, net of unamortized fees and premium	854,533	617,159
Deferred income taxes, net	79,681	46,618
Operating lease liabilities	81,674	91,209
Other long-term liabilities	95,736	61,813
Total liabilities	1,537,792	1,194,904
Commitments and contingencies
Stockholders’ equity:
Preferred stock, $0.01 par value; 10,000 shares authorized; none issued and outstanding at September 30, 2020 and December 31, 2019	0	0
Common stock, $0.01 par value; 200,000 shares authorized; 49,550 issued and 46,989 outstanding at September 30, 2020 and 49,283 issued and 46,722 outstanding at December 31, 2019	495	493
Additional paid-in capital	465,438	455,193
Treasury stock, at cost; 2,561 shares at September 30, 2020 and December 31, 2019	(119,143)	(119,143)
Retained earnings	460,250	400,047
Accumulated other comprehensive income	33	152
Total stockholders’ equity	807,073	736,742
Total liabilities and stockholders’ equity	$ 2,344,865	$ 1,931,646