Policy Claims and Other Benefits Payable - Schedule of Liability For Policy Claims and Other Benefits Payable (Details) - USD ($) $ in Thousands		12 Months Ended
		Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Roll Forward In Liability For Unpaid Claims And Claims Adjustment Expense [Abstract]
Policy claims and other benefits payable, beginning of period		$ 268,136	$ 238,157	$ 245,829
Reinsured policy claims and other benefits payable, beginning of period		323,195	263,003	264,049
Net balance, beginning of period		(55,059)	(24,846)	(18,220)
Incurred related to current year		162,256	143,518	138,139
Incurred related to prior years	[1]	2,230	(522)	212
Total incurred		164,486	142,996	138,351
Claims paid related to current year, net of reinsured policy claims received		(181,670)	(203,015)	(167,621)
Reinsured policy claims received related to prior years, net of claims paid		57,192	29,546	23,661
Total paid		(124,478)	(173,469)	(143,960)
Foreign currency translation		315	260	(1,017)
Net balance, end of period		(14,736)	(55,059)	(24,846)
Reinsured policy claims and other benefits payable, end of period		322,137	323,195	263,003
Policy claims and other benefits payable, end of period		$ 307,401	$ 268,136	$ 238,157

[1] Includes the difference between our estimate of claims incurred but not yet reported at year end and the actual incurred claims reported after year end.