public function get_thead_html() {
		ob_start();
		?>
		<thead>
			<tr>
			<?php foreach ( $this->get_columns() as $id => $data ) : ?>
				<th class="<?php echo $id; ?>">
					<?php if ( is_array( $data ) ) : ?>
						<?php if ( isset( $data['sortable'] ) && $data['sortable'] ) : ?>
							<a class="llms-sortable<?php echo ( $this->get_orderby() === $id ) ? ' active' : ''; ?>" data-order="<?php echo $this->get_new_order( $id ); ?>" data-orderby="<?php echo $id; ?>" href="#llms-gb-table-resort">
								<?php echo $data['title']; ?>
								<span class="dashicons dashicons-arrow-up asc"></span>
								<span class="dashicons dashicons-arrow-down desc"></span>
							</a>
						<?php else : ?>
							<?php echo $data['title']; ?>
						<?php endif; ?>
					<?php else : ?>
						<?php echo $data; ?>
					<?php endif; ?>
				</th>
			<?php endforeach; ?>
			</tr>
		</thead>
		<?php
		return ob_get_clean();
	}