Mortgage Loans on Real Estate (Details 1) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Reconciliation of mortgage loans:
Balance at beginning of year	$ 635,492	$ 188,651	$ 146,987
Additions:
New mortgage loans	8,223	524,088	113,996
Draws on existing loans	92,815	30,550	26,330
Total additions	101,038	554,638	140,326
Deductions:
Collections of principal	(191,134)	(80,552)	(49,974)
Conversions of real property	(45,044)	(23,288)	(45,836)
Charge Off	(3,053)	0	0
Total deductions	(239,231)	(103,840)	(95,810)
Change in balance due to foreign currency translation	(11,564)	(3,957)	(2,852)
Balance at end of year	$ 485,735	$ 635,492	$ 188,651