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Earnings Per Common Share | 6 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | 2. EARNINGS PER COMMON SHARE The following table provides details of the calculations of basic and diluted earnings per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Net income | $ | 56,454 |  |  | $ | 38,558 |  |  | $ | 114,865 |  |  | $ | 95,511 |
Shares used for determining basic earnings per common share | 81,128,442 |  |  | 80,104,004 |  |  | 81,038,096 |  |  | 79,923,790 |
Dilutive effect of: |  |  |  |  |  |  |
Stock options | 494,374 |  |  | 374,768 |  |  | 487,376 |  |  | 387,399 |
Performance and restricted shares | 634,627 |  |  | 613,931 |  |  | 611,325 |  |  | 592,281 |
Assumed conversion of Senior Exchangeable Notes (a) | 1,541,395 |  |  | — |  |  | 1,271,207 |  |  | — |
Assumed conversion of warrants (a) | 328,778 |  |  | — |  |  | 104,321 |  |  | — |
Shares used for determining diluted earnings per common share | 84,127,616 |  |  | 81,092,703 |  |  | 83,512,325 |  |  | 80,903,470 |
Basic earnings per common share | $ | 0.70 |  |  | $ | 0.48 |  |  | $ | 1.42 |  |  | $ | 1.20 |
Diluted earnings per common share | $ | 0.67 |  |  | $ | 0.48 |  |  | $ | 1.38 |  |  | $ | 1.18 |
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Anti-dilutive shares excluded from the computations of |  |  |  |  |  |  |
diluted earnings per share: |  |  |  |  |  |  |
Stock options, performance and restricted shares | 95,772 |  |  | 512,663 |  |  | 131,808 |  |  | 513,567 |
Exchangeable note hedges (a) | 1,541,395 |  |  | — |  |  | 1,271,207 |  |  | — |
Total | 1,637,167 |  |  | 512,663 |  |  | 1,403,015 |  |  | 513,567 |
(a) For additional information on the potential dilutive impact of the Senior Exchangeable Notes, warrants and exchangeable note hedges, see Note 11 - Debt in the 2010 Annual Report on Form 10-K. Subsequent Events On July 22, 2011, the Board of Directors authorized a three-for-two stock split. An additional one-half common share for every common share held of record as of August 10, 2011 will be distributed on August 24, 2011. Earnings per share and dividends per share presented in the interim financial statements have not been adjusted for the stock split. The condensed consolidated statements of income and comprehensive income present, on a pro forma basis, earnings per share and dividends per share reflecting the stock split. The following table provides the pro forma post-split basic and dilutive shares used for determining earnings per share:
| Three Months Ended June 30, |  | Six Months Ended June 30,
| 2011 |  | 2010 |  | 2011 |  | 2010
Basic shares | 121,692,663 |  |  | 120,156,006 |  |  | 121,557,144 |  |  | 119,885,685 |
Diluted shares | 126,191,424 |  |  | 121,639,055 |  |  | 125,268,488 |  |  | 121,355,205 |
On July 22, 2011, the Board of Directors also approved an increase in the quarterly dividend per share from $0.54 per share to $0.60 per share on a pre-split basis starting with the third quarter 2011 dividend. On a post-split basis the dividend per share increased from $0.36 per share to $0.40 per share.

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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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