Revenue (Details 3) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Policy issuance and renewal services | Transferred at point in time
Disaggregation of revenue by performance obligation
Management fee revenue, net	$ 405,978	$ 392,058
Administrative services
Disaggregation of revenue by performance obligation
Administrative services reimbursement revenue	145,963
Total revenue allocated to administrative services	159,037
Administrative services | Transferred over time
Disaggregation of revenue by performance obligation
Management fee revenue, net	13,074
Administrative services reimbursement revenue	145,963
Total revenue allocated to administrative services	$ 159,037