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Net Income Per Share | 12 Months Ended
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Dec. 31, 2012
Net Income Per Share [Abstract] |
Net Income Per Share [Text Block] | 8. Net Income Per Share The following table sets forth the computation of Net Income Per Share for the years ended December 31, 2012, 2011 and 2010 (in thousands, except per share data):
|  | 2012 |  | 2011 |  | 2010
Numerator for Basic and Diluted Earnings per Share - |  |  |  |  |  |
| Net Income | $ | 570,279 | $ | 1,091,123 | $ | 160,654
Denominator for Basic Earnings per Share - |  |  |  |  |  |
| Weighted Average Shares |  | 267,577 |  | 262,735 |  | 250,876
Potential Dilutive Common Shares - |  |  |  |  |  |
| Stock Options/SARs |  | 1,456 |  | 1,707 |  | 1,991
| Restricted Stock/Units and Performance Units/Stock |  | 1,729 |  | 1,826 |  | 1,633
Denominator for Diluted Earnings per Share - |  |  |  |  |  |
| Adjusted Diluted Weighted Average Shares |  | 270,762 |  | 266,268 |  | 254,500
Net Income Per Share |  |  |  |  |  |
| Basic | $ | 2.13 | $ | 4.15 | $ | 0.64
| Diluted | $ | 2.11 | $ | 4.10 | $ | 0.63
The diluted earnings per share calculation excludes stock options and SARs that were anti-dilutive. Shares underlying the excluded stock options and SARs totaled 0.5 million, 0.4 million and 0.3 million for the years ended December 31, 2012, 2011 and 2010, respectively.

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- Definition The entire disclosure for earnings per share. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1252-109256 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 55 -Paragraph 52 -URI http://asc.fasb.org/extlink&oid=16381557&loc=d3e4984-109258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=7655603&loc=d3e1278-109256 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 6: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 225 -SubTopic 10 -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03.21) -URI http://asc.fasb.org/extlink&oid=6880815&loc=d3e20235-122688 + Details
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