Margin Spaces

#container {
max-width: 960px;  <<<< Remove this
padding: 0 15px;
margin: 0 auto;
}

Change this:

.two-col-r .content, .two-col-l .content {
max-width: 650px;
width: 68%;
padding-top: 30px;
}

To this:

.two-col-r .content, .two-col-l .content {
max-width: 950px;
width: 68%;
padding-top: 30px;
}

Change this:

.sidebar-container {
overflow: visible;
max-width: 270px;
width: 28%;
padding-top: 30px;
}

To this:

.sidebar-container {
overflow: visible;
max-width: 450px;
width: 28%;
padding-top: 30px;
}

I think that is what you want.
Full width.