public function getValue()
 {
     if (!$this->getIsValueParsed()) {
         switch ($this->getAttribute()) {
             case 'customer_group_condition':
                 $value = $this->getData('value');
                 if (!$value) {
                     break;
                 }
                 $value = reset($value);
                 if (!$value) {
                     break;
                 }
                 $this->setValue(explode(',', $value));
                 $this->setIsValueParsed(true);
                 break;
         }
     }
     return parent::getValue();
 }