Te Conditional Green Card (Permanent Residence Card), is just like a regular Green Card, but is limited to a 2 year term. This is to allow the USCIS to verify if the marriage is legitimate or was entered into for the sole purpose of getting a Green Card. Aside form the 2 years term, the card is just like a regular Green Card.
So if you need to travel you can do so without the need to apply for the I-131 Parole or any other document. If you committed a Crime or any other violation that may impact your Green Card, I would suggest to consult an attorney before departing the US.
If you have EVER accumulated any overstay or out-of-status time in the USA you should not leave the country - you may not be allowed back in. Before you leave you should consult with an immigration attorney who can review your case and determine if you need a travel document or if you should leave the US at all.