In the USA, contrary to Germany or Switzerland, when it doesn't say 'tip included' (they do include the tip sometimes for parties of more than NN persons), the tip is not included.

If the service was ok I would have tipped, in a place as you describe it, 15% and 5%. If the service was extraordinary my tip could have been 20% and 10%.

I hope you were lucky on the gaming tables to afford such a dinner-place ...