I heard someone say "İyi akşamlar, kolay gelsin."

What does kolay gelsin mean in this sentence?

Kolay gelsin: This is used when the speaker sees someone working, busy with something. It can be a physical, or mental work. The expression indicates the speaker’s wish that whatever that person is doing at the moment, may be easy for him. The reply for “Kolay gelsin” is “Teşekkür ederim”

You can check it from here; http://www.turkishclass.com/turkish_lesson_6 

@harpoon

Oh! Now I understand.

Tesekkur ederim

You are welcome