What apology does Thorin make to Bilbo?

Thorin apologizes for his bitter words at the gate.

"Farewell, good thief," he said. "I go now to the halls of waiting to sit beside my fathers, until the world is renewed. Since I leave now all gold and silver, and go where it is of little worth, I wish to part in friendship from you, and I would take back my words and deeds at the Gate."