| 
           2013  | 
        
           2012  | 
        |||||||
| 
           Principal, January 1  | 
        $ | 47,293 | $ | 43,681 | ||||
| 
           New mortgages taken  | 
        5,000 | 5,160 | ||||||
| 
           Principal repaid  | 
        (3,355 | 
           )  | 
        (1,548 | 
           )  | 
      ||||
| 
           Principal, December 31  | 
        $ | 48,938 | $ | 47,293 | ||||