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Earnings Per Common Share (Tables) | 6 Months Ended
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Jun. 30, 2011
Earnings Per Share [Abstract] |
Schedule of Earnings Per Share, Basic and Diluted [Table Text Block] | 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 |
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share [Table Text Block] |
| 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.
Schedule of Subsequent Events [Table Text Block] | 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 |

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- Definition Tabular disclosure of securities (including those issuable pursuant to contingent stock agreements) that could potentially dilute basic earnings per share (EPS) in the future that were not included in the computation of diluted EPS because to do so would increase EPS amounts or decrease loss per share amounts for the period presented, by antidilutive securities. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -Subparagraph c -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 260 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6371337&loc=d3e3550-109257 + Details
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- Definition Tabular disclosure of significant events or transactions that occurred after the balance sheet date through the date the financial statements were issued or the date the financial statements were available to be issued. Examples include: the sale of a capital stock issue, purchase of a business, settlement of litigation, losses resulting from fire or flood, losses on receivables, significant realized and unrealized gains and losses that result from changes in quoted market prices of securities, declines in market prices of inventory, changes in authorized or issued debt (SEC), significant foreign exchange rate changes, substantial loans to insiders or affiliates, significant long-term investments, and substantial dividends not in the ordinary course of business. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 5 -Paragraph 11 -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Topic 855 -SubTopic 10 -Section 50 -Paragraph 2 -Name Accounting Standards Codification -URI http://asc.fasb.org/extlink&oid=6842918&loc=SL6314017-165662 + Details
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