Balance sheet
in CHF 000s| 
       Assets  | 
    
       Notes  | 
    
       31.12.2018  | 
    
       %  | 
    
       31.12.2017  | 
    
       %  | 
  
| 
       Cash and cash equivalents  | 
    
       
  | 
    
       8,365  | 
    
       
  | 
    
       3,809  | 
    
       
  | 
  
| 
       Other short-term receivables from third parties  | 
    
       
  | 
    
       32  | 
    
       
  | 
    
       18  | 
    
       
  | 
  
| 
       Other short-term receivables from companies in which the entity holds an investment  | 
    
       
  | 
    
       72,395  | 
    
       
  | 
    
       53,368  | 
    
       
  | 
  
| 
       Prepayments and accrued income  | 
    
       
  | 
    
       64  | 
    
       
  | 
    
       1,623  | 
    
       
  | 
  
| 
       Current assets  | 
    
       
  | 
    
       80,856  | 
    
       6.0  | 
    
       58,818  | 
    
       4.4  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Loans to companies in which the entity holds an investment  | 
    
       2.4  | 
    
       182,556  | 
    
       
  | 
    
       186,945  | 
    
       
  | 
  
| 
       Investments in subsidiaries and associates  | 
    
       2.5  | 
    
       1,076,437  | 
    
       
  | 
    
       1,078,723  | 
    
       
  | 
  
| 
       Financial assets  | 
    
       
  | 
    
       1,258,993  | 
    
       
  | 
    
       1,265,668  | 
    
       
  | 
  
| 
       Prepayments and accrued income  | 
    
       
  | 
    
       122  | 
    
       
  | 
    
       164  | 
    
       
  | 
  
| 
       Non-current assets  | 
    
       
  | 
    
       1,259,115  | 
    
       94.0  | 
    
       1,265,832  | 
    
       95.6  | 
  
| 
       Total assets  | 
    
       
  | 
    
       1,339,971  | 
    
       100.0  | 
    
       1,324,650  | 
    
       100.0  | 
  
| 
       Liabilities and shareholders' equity  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Other current payables due to third parties  | 
    
       
  | 
    
       145  | 
    
       
  | 
    
       11,854  | 
    
       
  | 
  
| 
       Accrued liabilities and deferred income  | 
    
       
  | 
    
       2,775  | 
    
       
  | 
    
       4,464  | 
    
       
  | 
  
| 
       Current liabilities  | 
    
       
  | 
    
       2,920  | 
    
       0.2  | 
    
       16,318  | 
    
       1.2  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Non-current interest-bearing debts due to third parties  | 
    
       
  | 
    
       112,556  | 
    
       
  | 
    
       116,945  | 
    
       
  | 
  
| 
       Non-current liabilities  | 
    
       
  | 
    
       112,556  | 
    
       8.4  | 
    
       116,945  | 
    
       8.8  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Liabilities  | 
    
       
  | 
    
       115,476  | 
    
       8.6  | 
    
       133,263  | 
    
       10.0  | 
  
| 
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       Share capital  | 
    
       2.6  | 
    
       53,498  | 
    
       
  | 
    
       53,498  | 
    
       
  | 
  
| 
       Legal capital reserves  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       – Reserves from capital contributions  | 
    
       2.7  | 
    
       13,644  | 
    
       
  | 
    
       51,093  | 
    
       
  | 
  
| 
       Legal retained earnings  | 
    
       
  | 
    
       2,886  | 
    
       
  | 
    
       2,886  | 
    
       
  | 
  
| 
       Voluntary retained earnings  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       – Free reserves  | 
    
       
  | 
    
       1,065,000  | 
    
       
  | 
    
       645,000  | 
    
       
  | 
  
| 
       – Available earnings  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
    
       
  | 
  
| 
       – Profit brought forward  | 
    
       
  | 
    
       2,861  | 
    
       
  | 
    
       2,423  | 
    
       
  | 
  
| 
       – Net profit  | 
    
       
  | 
    
       86,606  | 
    
       
  | 
    
       436,487  | 
    
       
  | 
  
| 
       Shareholders’ equity  | 
    
       
  | 
    
       1,224,495  | 
    
       91.4  | 
    
       1,191,387  | 
    
       90.0  | 
  
| 
       Total liabilities and shareholders' equity  | 
    
       
  | 
    
       1,339,971  | 
    
       100.0  | 
    
       1,324,650  | 
    
       100.0  |