$(document).ready(function(){
    console.log ($(document).height(), $(window).height());
    if ($(document).height() <= $(window).height())
    {
        if ($(window).height() > 650)
            $("#content_container").css ("height", $(window).height() - 140);
    }
});

$(window).resize(function(){
    if ($(document).height() <= $(window).height())
    {
        if ($(window).height() > 650)
            $("#content_container").css ("height", $(window).height() - 140);
    }
});