Should I have pushed this river?

[pearljam]

I think this was a bad play by me, I should have went over the top all-in, he didnt play it like he had the 3, what is your opinion?
Party Poker No-Limit Hold'em Tourney, Big Blind is t100 (5 handed) converter

Hero (t1665)
Button (t1240)
SB (t1380)
BB (t1830)
UTG (t1885)

Preflop: Hero is MP with A[img]/images/graemlins/diamond.gif[/img], A[img]/images/graemlins/club.gif[/img].
<font color="#666666">1 fold</font>, <font color="#CC3333">Hero raises to t250</font>, <font color="#666666">2 folds</font>, BB calls t150.

Flop: (t550) 2[img]/images/graemlins/diamond.gif[/img], 5[img]/images/graemlins/heart.gif[/img], A[img]/images/graemlins/heart.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t100</font>, Hero calls t100.

Turn: (t750) 4[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t100</font>, <font color="#CC3333">Hero raises to t400</font>, BB calls t300.

River: (t1550) K[img]/images/graemlins/club.gif[/img] <font color="#0000FF">(2 players)</font>
<font color="#CC3333">BB bets t100</font>, Hero calls t100.

Final Pot: t1750