Dow Closes at 18,000 for the First Time Since July

The Dow is up more than 3 percent year-to-date.

The Dow closed at 18,004 and is up more than 3 percent for the year after plummeting to new lows in early January.

The price of U.S. crude oil fell 1.4 percent to $39.78 a barrel after major oil producing nations could not reach an agreement to reduce output this past weekend in Doha, Qatar.

News of a strike by Kuwaiti oil workers reversed most of the early damage in oil and the broader markets, said Morningstar's Robert Johnson.

"World production seems to be coming down with or without the agreement," he said.

Corporate earnings will likely drive this week’s market activity, Johnson said.

"Recent corporate news has been poor, but better than expectations," he noted.