Well, they will just have to wait for the money. Call and see if you can arrange for a payment plan. If they say no and it goes to court the judge should allow a payment plan that will be based on your current income and bills. I had a friend this happend to over the summer. At least that is what happens in Pennsylvania. It may depend on what state you are in.

And you only owe $15,000 you ex owes the other $15,000 and make sure you hold him responsible for it!