CONDENSED CONSOLIDATED STATEMENTS OF INCOME AND COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Income Statement [Abstract]
Professional service revenues	$ 120,121	$ 112,403
Insurance service revenues	687,489	620,536
Total revenues	807,610	732,939
Costs and operating expenses:
Insurance costs	608,642	569,689
Cost of providing services (exclusive of depreciation and amortization of intangible assets)	56,450	45,705
Sales and marketing	49,191	48,708
General and administrative	25,302	27,650
Systems development and programming costs	11,040	6,389
Amortization of intangible assets	1,350	4,980
Depreciation	6,148	3,916
Total costs and operating expenses	758,123	707,037
Operating income	49,487	25,902
Other income (expense):
Interest expense and bank fees	(4,748)	(5,042)
Other, net	151	(42)
Income before provision for income taxes	44,890	20,818
Income tax expense	16,153	9,241
Net income	28,737	11,577
Other comprehensive income, net of tax	12	351
Comprehensive income	$ 28,749	$ 11,928
Net income per share:
Basic (in dollars per share)	$ 0.42	$ 0.16
Diluted (in dollars per share)	$ 0.41	$ 0.16
Weighted average shares:
Basic (in shares)	68,509,328	70,521,066
Diluted (in shares)	70,913,970	71,745,753