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SCHEDULE IV MORTGAGE LOANS ON REAL ESTATE - Rollforward (Details) - USD ($)
$ in Thousands
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Mortgage loans on real estate      
Balance at the beginning of the period $ 217,529 $ 165,656 $ 165,444
New mortgage loans 13,250 60,209 3,027
Other additions 7,435 6,925 6,347
Land conveyance   670  
Amortization of mortgage premium (10) (6) (5)
Collections of principal (8,278) (15,408) (9,155)
Loan loss reserve (125) (517) (2)
Balance at the end of the period $ 229,801 $ 217,529 $ 165,656