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Earnings Per Share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share | Earnings Per Share The following is a reconciliation of the average shares outstanding used to compute basic and diluted earnings per share.
| Three Months Ended March 31,
| 2013 |  | 2012
Basic weighted average common shares outstanding | 132,306,735 |  |  | 130,550,681 |
Effect of dilutive securities | 2,686,322 |  |  | 3,131,095 |
Diluted weighted average common shares outstanding | 134,993,057 |  |  | 133,681,776 |
For the three months ended March 31, 2013 and March 31, 2012, 2.7 million and 3.5 million, respectively, of common shares issuable upon the exercise of stock options were anti-dilutive and were excluded from the calculation of diluted earnings per share. No dividends were paid during each of the three months ended March 31, 2013 and March 31, 2012.

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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FASB -Name Statement of Financial Accounting Standard (FAS) -Number 128 -Paragraph 40 -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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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