You will need to replace your Permanent Resident Card if:   

1.         Your previous card was lost, stolen, mutilated, or destroyed

2.         Your card was issued to you before you were 14 and you have reached your 14th birthday

3.         You have been a commuter and are now taking up actual residence in the U.S.

4.         You have been a permanent resident residing in the United States and are now taking up commuter status

5.         Your status has been automatically converted to permanent resident status, this includes Special Agricultural Worker applicants who are converting to permanent resident status

An LPR has the right to live and work in the United States, and to file petitions for certain family members - spouse, and unmarried children and adult sons and daughters - so that they may gain LPR status too.  An LPR may also travel to and from the U.S., but you need to apply for a reentry permit if you plan a trip longer than one year.

Re-entry Permit is a travel document issued to lawful permanent residents and conditional residents to re-enter the U.S. after traveling abroad.