Wide receiver Wes Welker #83 of the Denver Broncos tries to avoid the tackle of free safety Earl Thomas #29 of the Seattle Seahawks during Super Bowl XLVIII at MetLife Stadium on February 2, 2014 in East Rutherford, New Jersey. (Photo by Jeff Gross/Getty Images)

by Curtis Crabtree
KJR reporter
Twitter: @Curtis_Crabtree

RENTON - The Seattle Seahawks and S Earl Thomas have agreed to a four-year, $40 million extension.

A source confirmed the deal, which was first reported by Ian Rapoport of the NFL Network.

The deal for Thomas extends his contract through the 2018 season and is worth $27.725 million in guaranteed money. Thomas becomes the first safety in the league to crack an annual value of $10 million a season.

Thomas was set to earn $4.625 million this fall in the last year of his rookie contract.

Thomas has become one of the top defensive players in the league and is a pivotal piece of Seattle's Super Bowl winning defense.

Per Randall Liu of the NFL league office, Thomas is the only safety in the last decade to record at least 100 tackles, five interceptions and two forced fumbles in a season.

Thomas had 105 tackles, five interceptions and two forced fumbles last season for the Seahawks.