formatDate: function(value, fmt) {
                if (value == null) return ''
                fmt = (typeof fmt == 'undefined') ? 'D MMM YYYY' : fmt
                return moment(value, 'YYYY-MM-DD').format(fmt)
            },
            showDetailRow: function(value) {
                var icon = this.$refs.vuetable.isVisibleDetailRow(value) ? 'glyphicon glyphicon-minus-sign' : 'glyphicon glyphicon-plus-sign'
                return [
                    '<a class="show-detail-row">',
           