Insurer HealthSpring has updated us all on the completion of its two-building MetroCenter campus, saying its development team hit the mark on the timeline. (The second building has risen atop the dirt in the photo here.) On top of that, the booming company now owned by Cigna says it has added 260 jobs here since August — that's about one new employee per day. HealthSpring announced its plans to consolidate space on Great Circle Road last June.