eXtensible Business Reporting Language (XBRL) is an XML-based language for the electronic transmission of business and financial data.  XBRL is not an accounting standard; it is simply a standard for transmitting business and financial data. 

The primary XBRL items in this Form 10-Q are (i) the Condensed Consolidated Statement of Income for the three and nine months ended September 30, 2011 and 2010, (ii) the Condensed Consolidated Balance Sheet at September 30, 2011 and December 31, 2010, (iii) the Condensed Consolidated Statement of Cash Flows for the nine months ended September 30, 2010 and 2009, and (iv) Notes to Condensed Consolidated Financial Statements.  The items can be viewed interactively by linking to the SEC website,
http://sec.gov/cgi-bin/viewer?action=view&cik=714603&accession_number=0001104659-11-062224&xbrl_type=v.

Alternatively, you have the option of viewing the XBRL information through any XBRL viewer you select. The data should be displayed in a readable format when you import all the files into your XBRL viewer.  The data in its native XML format (displayed when you merely open, and do not import, these items) will not be readable by you.  A resource for selecting an XBRL viewer is http://www.sec.gov/spotlight/xbrl/viewers.shtml.