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              [html]<thead><tr><td>Years ended December 31</td><td>( In millions of dollars )</td><td>2013</td></tr></thead><tbody><tr><td>2012</td><td>Operating income</td><td>$ 2.926</td></tr><tr><td>$ 2.766</td><td></td><td></td></tr><tr><td>Add ( deduct ):</td><td>Depreciation and amortization</td><td>1.898</td></tr><tr><td>1.819</td><td>Impairment of assets</td><td>–</td></tr><tr><td>80</td><td>Stock - based compensation expense</td><td>84</td></tr><tr><td>77</td><td>Restructuring, acquisition and other</td><td>expenses</td></tr><tr><td>85</td><td>92</td></tr></tbody>
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