Balance Sheet Details (Details) - USD ($) $ in Thousands	Mar. 31, 2020	Dec. 31, 2019
Other current assets:
Restricted cash and cash equivalents	$ 15,380	$ 18,393
Income tax receivable	0	5,984
Other	15,289	16,069
Other current assets	30,669	40,446
Fixed assets:
Furniture and equipment	45,895	37,315
Software	199,587	191,050
Leasehold improvements	9,825	9,367
Fixed assets, gross	255,307	237,732
Accumulated depreciation	(138,589)	(132,900)
Fixed assets, net	116,718	104,832
Other assets:
Life insurance cash surrender value	65,008	79,515
Other	39,821	40,739
Other assets	104,829	120,254
Accounts payable and accrued expenses:
Trade accounts payable	26,001	26,985
Subcontractor payable	81,385	75,562
Accrued expenses	50,151	36,344
Loss contingencies	6,521	6,146
Professional liability reserve	7,941	7,925
Other	3,189	3,178
Accounts payable and accrued expenses	175,188	156,140
Accrued compensation and benefits:
Accrued payroll	55,312	47,381
Accrued bonuses	15,511	22,613
Accrued travel expense	2,446	2,459
Health insurance reserve	4,484	4,019
Workers compensation reserve	7,788	8,782
Deferred compensation	64,966	81,064
Other	2,511	4,614
Accrued compensation and benefits	153,018	170,932
Other current liabilities:
Acquisition related liabilities	3,300	20,000
Other	8,083	5,302
Other current liabilities	11,383	25,302
Other long-term liabilities:
Workers compensation reserve	16,668	18,291
Professional liability reserve	35,146	34,606
Unrecognized tax benefits	5,641	5,431
Other	4,280	3,485
Other long-term liabilities	$ 61,735	$ 61,813