text: **Useful Lives**
  We depreciate the cost of property, plant and equipment over their 
  estimated useful 
  lives by considering industry trends and company- 
  specific factors, including changing technologies and expectations for 
  the in-service period of certain assets at the time. We reassess our 
  lives annually or when circumstances change to 
  estimates of useful 
  ensure they match the anticipated life of the technology from a 
  revenue-producing perspective. If technological change happens more 
  quickly, or in a different way than anticipated, we might have to reduce 
  the estimated life of property, plant and equipment, which could result 
  in a higher depreciation expense in future periods or an impairment 
  charge to write down the value. We will change our depreciation 
  methods, depreciation rates or asset useful 
  lives if they are different 
  from our previous estimates. We recognize the effect of these changes 
  in net income prospectively. 
  
  MANAGEMENT’S REPORT ON INTERNAL CONTROL OVER 
  FINANCIAL REPORTING 
  Management is responsible for establishing and maintaining adequate 
  internal controls over financial reporting. 
  
  Management assessed the effectiveness of our internal controls over 
  financial reporting as of December 31, 2013, based on the criteria set 
  out in the*Internal Control – Integrated Framework (1992)*issued by the 
  Committee of Sponsoring Organizations of the Treadway Commission 
  (COSO), and concluded that 
  that date. Our 
  independent auditor, KPMG LLP, issued an audit report stating that, as 
  of December 31, 2013, we had effective internal controls over financial 
  reporting in all material respects, based on the same criteria. 
  
  it was effective at 