Balance Sheet Details (Details) - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
Other current assets:
Restricted cash and cash equivalents	$ 16,064	$ 20,271
Other	13,721	14,336
Other current assets	29,785	34,607
Fixed assets:
Furniture and equipment	27,333	25,582
Software	120,389	112,405
Leasehold improvements	8,810	6,832
Fixed assets, gross	156,532	144,819
Accumulated depreciation	(91,164)	(84,865)
Fixed assets, net	65,368	59,954
Other assets:
Life insurance cash surrender value	41,562	32,190
Other	30,032	25,344
Other assets	71,594	57,534
Accounts payable and accrued expenses:
Trade accounts payable	27,268	33,392
Subcontractor payable	37,109	51,973
Accrued expenses	41,329	37,251
Professional liability reserve	6,559	10,254
Other	6,678	4,642
Accounts payable and accrued expenses	118,943	137,512
Accrued compensation and benefits:
Accrued payroll	31,457	30,917
Accrued bonuses	15,315	26,992
Accrued travel expense	3,205	2,972
Accrued health insurance reserve	3,369	3,189
Accrued workers compensation reserve	8,461	8,406
Deferred compensation	42,823	32,690
Other	2,653	2,827
Accrued compensation and benefits	107,283	107,993
Other current liabilities:
Acquisition related liabilities	5,164	6,921
Other	7,223	9,690
Other current liabilities	12,387	16,611
Other long-term liabilities:
Workers’ compensation reserve	18,755	18,708
Professional liability reserve	38,841	37,338
Deferred rent	14,199	13,274
Unrecognized tax benefits	8,693	8,464
Other	1,813	4,312
Other long-term liabilities	$ 82,301	$ 82,096