def _net_debt(column):
    """
    Uses balance sheet to get company net debt
    """
    long_term_debt = column['Long-term debt']
    short_long_debt = column['Short-term debt']
    cash = column['Cash and cash equivalents']
    short_investments = column['Short-term investments']
    return long_term_debt + short_long_debt - cash - short_investments
