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