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Net Income Per Share | 12 Months Ended
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Dec. 31, 2012
Earnings Per Share [Abstract] |
Net Income Per Share [Text Block] | Net Income Per Share The following table sets forth the computation of net income per share on a basic and diluted basis for the years ended December 31 (shares in thousands):
|  | 2012 |  | 2011 |  | 2010 |
Net income attributable to shareholders |  | $ | 506,332 |  |  | $ | 598,810 |  |  | $ | 479,630 |  |
Weighted-average shares outstanding - basic |  | 109,240 |  |  | 114,025 |  |  | 117,997 |  |
Net effect of various dilutive stock-based compensation awards |  | 1,837 |  |  | 1,907 |  |  | 1,580 |  |
Weighted-average shares outstanding - diluted |  | 111,077 |  |  | 115,932 |  |  | 119,577 |  |
Net income per share: |  |  |  |  |  |  |
Basic |  | $ | 4.64 |  |  | $ | 5.25 |  |  | $ | 4.06 |  |
Diluted (a) |  | $ | 4.56 |  |  | $ | 5.17 |  |  | $ | 4.01 |  |
(a) | Stock-based compensation awards for the issuance of 1,424 shares, 1,051 shares, and 3,257 shares for the years ended December 31, 2012, 2011, and 2010, respectively, were excluded from the computation of net income per share on a diluted basis as their effect is anti-dilutive.

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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=6920599&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=6945512&loc=d3e4984-109258 Reference 3: 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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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 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=6920599&loc=d3e1278-109256 Reference 5: 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 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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