As it does every year, the arrival of "Black Monday" signals the end of the line for coaches across the NFL. Some don't even make it that far, with the Giants' Ben McAdoo losing his job weeks ago after stacking double-digit losses and making the misguided decision to bench Eli Manning. Still, most teams waited until after the conclusion of Week 17 to make their coaching changes.

Teams make coaching changes for different reasons, and not every decision makes sense in the moment. However, most of the moves came as little surprise. Here's an updated look at which teams have made changes so far.

Arizona Cardinals. Under Bruce Arians, the Cardinals enjoyed their most consistently good period since before the NFL/AFL merger. They won 10 or more games in each of his first three seasons with the team, reaching the conference championship game in 2015. But as the Cardinals aged -- they entered '17 with the oldest roster in the league -- the team's fortunes diminished. With a rebuild in the offing, the 65-year-old Arians decided to retire. Cardinals stalwarts Larry Fitzgerald and Carson Palmer could soon follow. General manager Steve Keim has already taken steps to interview Eagles assistant John DeFilippo for the job.

Chicago Bears. In his two previous stops as a head coach, John Fox guided his team to a Super Bowl appearance within three years. The Bears haven't reached a Super Bowl during his tenure nor have they come particularly close, posting losing records and missing the playoffs each of Fox's three seasons at the helm. With the organization investing so heavily in quarterback Mitchell Trubisky last April, the Bears had little choice but to move on from Fox and begin searching for a headman better suited to developing their potential franchise passer. Chicago reportedly has interest in DeFilippo, one of the architects of Carson Wentz's development.

Detroit Lions. When Jim Caldwell signed an extension last offseason, his hold on the Lions' head-coaching position appeared as strong as ever. That grip loosened considerably as Detroit fell out of the NFC North title race despite the Packers and Vikings dealing with significant injuries to their starting quarterbacks, and Caldwell couldn't figure out a way to push his offense over the top despite the team's massive investment in Matthew Stafford. Caldwell becomes the first full-time head coach to leave the Lions with a winning record since Joe Schmidt in 1972. General manager Bob Quinn's ties to the Patriots could lead to one of Bill Belichick's assistants replacing Caldwell.

Indianapolis Colts. Chuck Pagano survived the showdown between him and the front office after the 2015 season and landed a four-year extension in the process, suggesting that he could carry the torch from Jeff Fisher as the NFL's most Teflon coach. However, the Colts' struggles over the past three years -- the team failed to produce a winning record since 2014 -- combined with deeply concerning deterioration of Andrew Luck's shoulder and the arrival of a new general manager finally ended Pagano's time in Indianapolis. Like other vacancies, the Colts have their eyes on Patriots offensive coordinator Josh McDaniels.

New York Giants. New York made Ben McAdoo the head coach in order to ensure continuity following Tom Coughlin's departure, and the decision seemed validated by an 11-5 record and wild-card berth that year. However, no NFL team in 2017 underperformed expectations to a greater degree than the Giants, who won just two games during the first three months of the season. McAdoo sealed his fate by benching Eli Manning for Geno Smith late in November. The team fired McAdoo less than a week later and began cleaning out the front office soon after. Now, with Dave Gettleman in as GM, New York has spent a month quietly vetting candidates.

Oakland Raiders. Jack Del Rio engendered considerable goodwill from media, fans and ownership after breaking the Raiders' 13-season playoff drought a year ago. Del Rio's follow-up effort -- 10 losses, including some late-game heartbreakers -- apparently soured the team on the veteran head coach to the point where that extension didn't matter, resulting in his firing after three seasons. Reportedly, the Raiders want to bring Jon Gruden back to Oakland by offering an ownership stake, something that could indeed entice the former Super Bowl-winning coach out of the broadcast booth.