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Earnings Per Common Share | 3 Months Ended
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Mar. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Common Share | Earnings Per Common Share Basic net earnings per share are computed using the weighted-average number of common shares outstanding. The dilutive effect of potential common shares outstanding is included in diluted net earnings per share. The computations of basic net earnings per share and diluted net earnings per share are as follows:
|  | Three Months Ended March 31, 2013
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 14,954,000 |  |  |  |  |
| Basic earnings per common share | $ | 14,954,000 |  |  | 68,463,000 |  |  | $ | 0.22 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 898,000 |  |  | — |
| Diluted earnings per common share | $ | 14,954,000 |  |  | 69,361,000 |  |  | $ | 0.22 |
|  | Three Months Ended March 31, 2012
| Income (Numerator) |  | Shares (Denominator) |  | Per-share Amount
| Net income | $ | 8,578,000 |  |  |  |  |
| Basic earnings per common share | $ | 8,578,000 |  |  | 67,084,000 |  |  | $ | 0.13 |
| Effect of dilutive securities: |  |  |  |  |
| Stock options and restricted stock |  |  | 1,001,000 |  |  | — |
| Diluted earnings per common share | $ | 8,578,000 |  |  | 68,085,000 |  |  | $ | 0.13 |
Stock awards to purchase 544,000 shares of common stock having an average exercise price of $23.50 per common share were outstanding during the three months ended March 31, 2013 but not included in the computation of diluted earnings per common share because the exercise prices of the options were greater than the average market price of the common shares, and therefore, would be antidilutive. Stock awards to purchase 574,000 shares of common stock having an average exercise price of $17.50 per common share were outstanding during the three months ended March 31, 2012 but not included in the computation of diluted earnings per common share because the exercise prices of the options were greater than the average market price of the common shares, and therefore, would be antidilutive.

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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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