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Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Common Share | 2. Earnings Per Common Share Basic earnings per common share are calculated by dividing net income by the weighted average number of common shares outstanding during the period. Diluted earnings per common share adjust basic earnings per share for the effects of potentially dilutive common shares. Potentially dilutive common shares include the dilutive effects of shares issuable under our equity compensation plans, including stock options and restricted stock, and, for the three months ended March 31, 2012, shares issuable upon the potential conversion of our 3 3/4% senior subordinated convertible notes that were due on July 15, 2012 (“Convertible Notes”), each using the treasury stock method. In addition, the conversion feature of our Convertible Notes had a dilutive effect on our earnings per share for the three months ended March 31, 2012, assuming the conversion premium was converted into common stock based on the average closing price per share of our stock during the period, because the average closing price per share of our common stock for such periods was above the conversion price of the Convertible Notes of $31.25 per share.
|  | Three Months Ended March 31, |
|  | 2013 |  |  | 2012 |
Numerator—basic and diluted |  |  |  |  |  |  |  |
Net income |  | $ | 23,680 |  |  | $ | 18,431 |
Denominator |  |  |  |  |  |  |  |
Weighted average number of common shares outstanding—basic |  |  | 39,403 |  |  |  | 40,358 |
Effect of dilutive stock options |  |  | 595 |  |  |  | 963 |
Effect of dilutive convertible notes |  |  | — |  |  |  | 1,159 |
Effect of dilutive restricted shares |  |  | 622 |  |  |  | 705 |
Weighted average number of common shares outstanding—diluted |  |  | 40,620 |  |  |  | 43,185 |
Earnings per common share—basic |  | $ | 0.60 |  |  | $ | 0.46 |
Earnings per common share—diluted |  | $ | 0.58 |  |  | $ | 0.43 |
Antidilutive stock options and restricted shares |  |  | 3,486 |  |  |  | 2,081 |

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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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