NL100 - 4-handed AT vs 3-bet

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Poker Stars - No Limit Hold'em Cash Game - $0.50/$1 Blinds - 4 Players - (LegoPoker HH Converter)

SB: $83.25
BB: $98.55
Hero (UTG): $105.50
BTN: $100.40

Reads: <font color="blue">Villain seems solid. I'd been somewhat active, but I wasn't sure whether not he would be 3-betting light in a spot like this.</font>

Preflop: Hero is dealt A[img]/images/graemlins/club.gif[/img] T[img]/images/graemlins/spade.gif[/img] (4 Players)
<font color="red">Hero raises to $4.00</font>, <font color="red">BTN raises to $12.00</font>, 2 folds, Hero calls $8.00

Flop: ($25.50) A[img]/images/graemlins/spade.gif[/img] 8[img]/images/graemlins/club.gif[/img] K[img]/images/graemlins/spade.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $18.00</font>, Hero calls $18.00

Turn: ($61.50) 3[img]/images/graemlins/club.gif[/img] (2 Players)
Hero checks, <font color="red">BTN bets $39.00</font>

This bet seems strong after my flop call. Easy fold?