All planets are aligned for a dollar surge. Now that the Greek drama is over, all you have left is a somewhat hawkish FED that gets good data from the economy, and an ECB that is pumping 60 billion per month into the economy. Why would you not short the Euro and buy the dollar??? I invite you to comment, I am curious if anyone has a positive scenario for the European currency.
In order to borrow euros you do not need to convert your dollars, that is why it is called borrowing, then you go with your euros to another country and you exchange the whole amount to that currency (I don't know if you can do that without exchanging to dollars first, but it doesn't really matter in this case) hence the euro goes down. There are many articles about carry trade on the web.