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Earnings Per Share | 3 Months Ended
--- | ---
Mar. 31, 2013
Earnings Per Share [Abstract] |
Earnings Per Share [Text Block] | Earnings Per Share The following table sets forth the computation of earnings per common share and earnings per common share - assuming dilution:
| Three Months Ended March 31,
| 2013 |  | 2012
| (Dollars in thousands, except per share data)
Numerator: |  |  |
Net income - numerator for earnings per common share | $ | 26,031 |  |  | $ | 10,471 |
Interest on convertible subordinated debentures (net of income tax benefit) | — |  |  | 258 |
Numerator for earnings per common share - assuming dilution | $ | 26,031 |  |  | $ | 10,729 |
Denominator: |  |  |
Weighted average common shares outstanding (1) | 63,313,568 |  |  | 59,700,537 |
Effect of dilutive securities: |  |  |
Convertible subordinated debentures | — |  |  | 2,883,310 |
Convertible senior notes | 4,483,492 |  |  | 2,719,840 |
Stock options and deferred compensation agreements | 908,853 |  |  | 626,622 |
Denominator for earnings per common share - assuming dilution | 68,705,913 |  |  | 65,930,309 |
Earnings per common share | $ | 0.41 |  |  | $ | 0.18 |
Earnings per common share - assuming dilution | $ | 0.38 |  |  | $ | 0.16 |
_____________________________
(1) | Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.
Options to purchase shares of our common stock that were outstanding during the respective periods indicated but were not included in the computation of diluted earnings per share because the options' exercise price was greater than the average market price of the common shares are as follows:
Period |  | Number of Shares |  | Range of Exercise Prices
|  |  |  | Minimum |  | Maximum
Three months ended March 31, 2013 |  | 3,200 |  |  | $14.34 |  | $14.62
Three months ended March 31, 2012 |  | 1,499,900 |  |  | $11.88 |  | $14.34
In November 2011, our board of directors approved a share repurchase program authorizing us to repurchase up to 10,000,000 shares of our common stock. As of March 31, 2013, no shares had been repurchased under this program.

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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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