<?php
$post_id = get_the_ID();
$post = get_post( $post_id, OBJECT, 'edit' );

$content = $post->post_content;
$editor_id = 'editpost';

$editor_args = array(
'media_buttons' => false,
'editor_class' => my_editor,
'textarea_rows' => 10,
'wpautop' => false,
'tinymce' => array(
'content_css' => get_stylesheet_directory_uri() . '/custom/editor-style_single.css'
    )
);

?>
<div id="inline_editor">
<?php wp_editor( $content, $editor_id, $editor_args ); ?>
</div>