CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Income Statement [Abstract]
Professional service revenues	$ 108,642	$ 109,593	$ 228,763	$ 221,996
Insurance service revenues	691,899	636,253	1,379,388	1,256,789
Total revenues	800,541	745,846	1,608,151	1,478,785
Costs and operating expenses:
Insurance costs	599,535	596,673	1,208,177	1,166,362
Cost of providing services (exclusive of depreciation and amortization of intangible assets)	50,825	44,034	107,275	89,739
Sales and marketing	45,940	43,800	95,131	92,508
General and administrative	28,224	18,951	53,526	46,601
Systems development and programming costs	11,415	6,457	22,455	12,846
Amortization of intangible assets	1,316	5,005	2,666	9,985
Depreciation	6,451	4,559	12,599	8,475
Total costs and operating expenses	743,706	719,479	1,501,829	1,426,516
Operating income	56,835	26,367	106,322	52,269
Other income (expense):
Interest expense and bank fees	(4,857)	(5,038)	(9,605)	(10,080)
Other, net	271	163	422	121
Income before provision for income taxes	52,249	21,492	97,139	42,310
Income tax expense	12,298	9,210	28,451	18,451
Net income	39,951	12,282	68,688	23,859
Other comprehensive income, net of tax	68	74	80	425
Comprehensive income	$ 40,019	$ 12,356	$ 68,768	$ 24,284
Net income per share:
Basic (in dollars per share)	$ 0.58	$ 0.17	$ 1.00	$ 0.34
Diluted (in dollars per share)	$ 0.56	$ 0.17	$ 0.97	$ 0.33
Weighted average shares:
Basic (in shares)	69,029,749	70,728,934	68,770,976	70,625,000
Diluted (in shares)	71,167,177	72,319,992	71,101,716	72,022,065