Balance Sheet Details (Details) - USD ($) $ in Thousands	Sep. 30, 2020	Dec. 31, 2019
Other current assets:
Restricted cash and cash equivalents	$ 15,194	$ 18,393
Income taxes receivable	0	5,984
Other	15,397	16,069
Other current assets	30,591	40,446
Fixed assets:
Furniture and equipment	45,807	37,315
Software	210,735	191,050
Leasehold improvements	9,600	9,367
Fixed assets, gross	266,142	237,732
Accumulated depreciation	(153,390)	(132,900)
Fixed assets, net	112,752	104,832
Other assets:
Life insurance cash surrender value	87,485	79,515
Other	38,346	40,739
Other assets	125,831	120,254
Accounts payable and accrued expenses:
Trade accounts payable	29,331	26,985
Subcontractor payable	59,753	75,562
Accrued expenses	44,240	36,344
Loss contingencies	7,302	6,146
Professional liability reserve	9,104	7,925
Other	3,205	3,178
Accounts payable and accrued expenses	152,935	156,140
Accrued compensation and benefits:
Accrued payroll	51,016	47,381
Accrued bonuses	27,833	22,613
Accrued travel expense	1,796	2,459
Health insurance reserve	5,537	4,019
Workers compensation reserve	9,554	8,782
Deferred compensation	87,934	81,064
Other	1,066	4,614
Accrued compensation and benefits	184,736	170,932
Other current liabilities:
Acquisition related liabilities	1,400	20,000
Other	10,484	5,302
Other current liabilities	11,884	25,302
Other long-term liabilities:
Workers compensation reserve	19,711	18,291
Professional liability reserve	33,642	34,606
Unrecognized tax benefits	5,751	5,431
Other	36,632	3,485
Other long-term liabilities	$ 95,736	$ 61,813