Overfull \hbox warning. Table is cut off at the end. Does anyone know how to fix this?

Question

\begin{table}[!h]\centering

    \begin{tabular}{|l|l|l|}

    \hline

        \textbf{Step} & \textbf{Know}     
                                   & \textbf{Reason}                                            \\ \hline
        P             & $x$ is an even integer and $y$ is an odd integer                         & Hypothesis                                                 \\ \hline
        P1            & There exists  $m$ and $n$ in the set of all integers, such that          & Definition of even and odd integers                               \\
                      & $x = 2m$ and $y = 2n +1$                         &                                                            \\ \hline
        P2            & $x + y = 2m + 2n + 1$                         &  Substitution of $x = 2m $ and $y = 2n +1$ into $x + y$ \\ \hline
        P3            & $x+y=2(m+n)+1 $                           & Algebra                                                    \\      &                                                           \\ \hline
        P4            & $(m+n)$ is in the set of all integers                          & Closure property of the integers under addition            \\ \hline
        P5            & there exist $q$ in the set of all integers, such that $x+y = 2q+1$                & Conclude that $2(q)+1$ is an integer                                      \\
                      &                                         &                                                            \\ \hline
        Q             & $x + y$ is odd                  &  Definition of an odd integer                           \\ \hline
        \textbf{Step} & \textbf{Know}                                        & \textbf{Reason}                                            \\ \hline

 \end{tabular}
\end{table}