They are a well run team who are willing to spend money, but they've also been fortunate. But I guess you have to be to win two SBs in 10 years and come close to a third with different coaches and different QBs.
In addition to never having to pay the penalty for drafting the wrong QB top 5 AND signing him to a long deal, they got rewarded for it with a bounty of picks to rebuild the team. They benefited this year from a weak NFC, being healthy themselves (Barkley always had a long term injury with the Giants, but played every game this year), then Detroit's defense gets wiped out by injuries and they get a dream path to the NFC Championship.