public function showReport($report_id)
    {
        if (!is_numeric($report_id) || 0 >= $report_id) {
            throw new InvalidArgumentException(
                "Api::showReport report_id field should be positive integer");
        }

        /** @var $command \Guzzle\Service\Command\AbstractCommand */
        $command = $this->client->getCommand('ShowReport',array('id'=>$report_id));

        return $this->executeCommand($command);
    }