23 Other current liabilities, accruals and deferrals
| 
       (CHF 1,000)  | 
    
       
  | 
    
       31.12.2017  | 
    
       
  | 
    
       31.12.2016  | 
  
| 
       Expenses not invoiced  | 
    
       
  | 
    
       37,457  | 
    
       
  | 
    
       40,209  | 
  
| 
       Accrued interest on financial liabilities  | 
    
       
  | 
    
       7,373  | 
    
       
  | 
    
       9,992  | 
  
| 
       Investments not invoiced  | 
    
       
  | 
    
       38,211  | 
    
       
  | 
    
       36,951  | 
  
| 
       Other deferred income and accruals  | 
    
       
  | 
    
       13,464  | 
    
       
  | 
    
       5,891  | 
  
| 
       Deferred income and accruals  | 
    
       
  | 
    
       96,505  | 
    
       
  | 
    
       93,043  | 
  
| 
       Cross currency swap  | 
    
       
  | 
    
       6,088  | 
    
       
  | 
    
       0  | 
  
| 
       Amounts due to personnel (holidays and overtime)  | 
    
       
  | 
    
       4,078  | 
    
       
  | 
    
       3,594  | 
  
| 
       Deposits and advance payments by customers  | 
    
       
  | 
    
       9,225  | 
    
       
  | 
    
       4,011  | 
  
| 
       Social security contributions  | 
    
       
  | 
    
       5,919  | 
    
       
  | 
    
       2,425  | 
  
| 
       Other liabilities  | 
    
       
  | 
    
       4,083  | 
    
       
  | 
    
       1,063  | 
  
| 
       Total other current liabilities, accruals and deferrals  | 
    
       
  | 
    
       125,898  | 
    
       
  | 
    
       104,136  | 
  
Other current liabilities, accruals and deferrals include the following financial instruments:
| 
       (CHF 1,000)  | 
    
       
  | 
    
       31.12.2017  | 
    
       
  | 
    
       31.12.2016  | 
  
| 
       Expenses not invoiced  | 
    
       
  | 
    
       37,457  | 
    
       
  | 
    
       40,209  | 
  
| 
       Accrued interest on financial liabilities  | 
    
       
  | 
    
       7,373  | 
    
       
  | 
    
       9,992  | 
  
| 
       Investments not invoiced  | 
    
       
  | 
    
       38,211  | 
    
       
  | 
    
       36,951  | 
  
| 
       Total financial liabilities carried at amortised cost  | 
    
       
  | 
    
       83,041  | 
    
       
  | 
    
       87,152  | 
  
| 
       Cross currency swap  | 
    
       
  | 
    
       6,088  | 
    
       
  | 
    
       0  | 
  
| 
       Total financial liabilities measured at fair value  | 
    
       
  | 
    
       6,088  | 
    
       
  | 
    
       0  | 
  
| 
       Amounts due to personnel (holidays and overtime)  | 
    
       
  | 
    
       4,078  | 
    
       
  | 
    
       3,594  | 
  
| 
       Deposits and advance payments by customers  | 
    
       
  | 
    
       9,225  | 
    
       
  | 
    
       4,011  | 
  
| 
       Social security contributions  | 
    
       
  | 
    
       5,919  | 
    
       
  | 
    
       2,425  | 
  
| 
       Other liabilities  | 
    
       
  | 
    
       4,083  | 
    
       
  | 
    
       1,063  | 
  
| 
       Other deferred income and accruals  | 
    
       
  | 
    
       13,464  | 
    
       
  | 
    
       5,891  | 
  
| 
       Total other current liabilities, accruals and deferrals excluding financial instruments  | 
    
       
  | 
    
       36,769  | 
    
       
  | 
    
       16,984  | 
  
| 
       Total other current liabilities, accruals and deferrals  | 
    
       
  | 
    
       125,898  | 
    
       
  | 
    
       104,136  |