By William Schomberg and David Ljunggren DRESDEN, Germany (Reuters) - Greece and its creditors need to quickly agree on a broad deal to address the Greek debt crisis and then work out the details before Athens hits deadlines for repayments, U.S. Treasury Secretary Jack Lew said on Friday. Lew, speaking to reporters after a meeting of policymakers from the Group of Seven economies, said a speedy deal would reduce the chances of an "accident" and he wanted to see a pragmatic outcome to the protracted crisis. Greece and its creditors from the euro zone countries and the International Monetary Fund are trying to hammer out a cash-for-reforms deal that would prevent the country from defaulting on its debt and potentially leaving the euro zone.