Being new to Bittrex, I made some purchases without writing down the amount in US dollars, assuming it would be saved in the order history. But, everything is in BTC conversions and not in US dollars.

Is there a way to determine how much US dollars you purchased a particular coin at? For instance, if I bought OMG 3 weeks ago, how much did I pay for it in US dollars based on today's current BTC value? If this is impossible, wouldn't it be nice to have the amount of US dollars saved in some format so you can see how much your coin is currently worth in US dollars?