I didn't have any significant read as I was multi-tabling and I seem to recall that this was a relatively new player to this table.

Three betting pre-flop seems a overly optimistic to me. I can see playing the flop with a check-raise, but I was just reading "if you're going to call, it's just as well to lead out...," which is the same reason I bet out on the river. Check calling makes more sense. Thanks for the input!