def METHOD_NAME(key, delta=1, host=DEFAULT_HOST, port=DEFAULT_PORT):
    """
    Decrement the value of a key
    CLI Example:
    .. code-block:: bash
        salt '*' memcached.decrement <key>
        salt '*' memcached.decrement <key> 2
    """
    conn = _connect(host, port)
    _check_stats(conn)
    cur = get(key)
    if cur is None:
        raise CommandExecutionError("Key '{}' does not exist".format(key))
    elif not isinstance(cur, int):
        raise CommandExecutionError(
            "Value for key '{}' must be an integer to be decremented".format(key)
        )
    try:
        return conn.decr(key, delta)
    except ValueError:
        raise SaltInvocationError("Delta value must be an integer")