The Detroit Institute of Art “went to court Tuesday to protect what museum leaders say is its rightful ownership of an 1889 painting by van Gogh worth at least $15 million, by one estimate. The DIA took the action after failing to resolve a long-simmering dispute with the heirs of a Nazi-era Jewish collector, who claim that the painting, which has been in the DIA’s collection since 1970, belongs to the family.”