$1 special dividend is coming very soon.

Here is the data I gathered from http://www.nasdaq.com/symbol/tlab/dividend-history
Amount Ex-Dividend Date Record Date Pay Date Declare Date Qualified? [?] Type
$1.00 12/24/2012 12/14/2012 12/21/2012 11/29/2012 Yes Special

Can anyone tell me why ex-dividend date is after pay date? it is really confusing me