Eloquent returning non readable array in Laravel5

I have doing following query

$x = Invoice::all();

dd($x);

But I am getting following answer where I am not able to read most of object.

 #table: "event_invoice"
      #primaryKey: "Id"
      #connection: null
      #perPage: 15
      +incrementing: true
      +timestamps: true
      #attributes: array:38 [ …38]
      #original: array:38 [ …38]
      #relations: []
      #hidden: []
      #visible: []
      #appends: []
      #fillable: []
      #guarded: array:1 [ …1]
      #dates: []
      #dateFormat: null
      #casts: []
      #touches: []
      #observables: []
      #with: []
      #morphClass: null
      +exists: true
      +wasRecentlyCreated: false

Here the arrays is not readable.

My Eloquent look like this

<?php

namespace App;

use Illuminate\Database\Eloquent\Model;

class Invoice extends Model
{
    //
     protected $table = 'event_invoice';
     protected $primaryKey = 'Id';

    /*
     * An invoice can has many payments 
     *
     */
     public function payments(){
        return $this->hasMany('App\paymentrecieved');
    }

    public function comments(){
        return $this->hasMany('App\comments');
    }
}

Is there any mistake I am doing

via Chebli Mohamed