Liability for Unpaid Claims - Reconciliation of Net Incurred and Paid Claims Development to Liability (Details) - USD ($) $ in Thousands	Sep. 30, 2017	Dec. 31, 2016
Policy claims and other benefits payable:
Short-duration contracts	$ 23,193	$ 26,721
Insurance lines other than short duration—health	120,364	116,407
Insurance lines other than short duration—life	175,275	156,437
Total policy claims and other benefits payable	$ 318,832	$ 299,565