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Earnings Per Share
 12 Months Ended
Dec. 31, 2012
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:
 
Year Ended December 31,
 
2012
 
2011
 
2010
 
(Dollars in thousands, except per share data)
Numerator:
 
 
 
 
 
Net income—numerator for earnings per common share
$
57,798

 
$
86,248

 
$
42,933

Interest on convertible subordinated debentures (net of income tax benefit)
517

 
1,034

 
1,035

Numerator for earnings per common share—assuming dilution
$
58,315

 
$
87,282

 
$
43,968

Denominator:
 
 
 
 
 
Weighted average common shares outstanding (1)
61,258,825

 
59,482,349

 
58,506,804

Effect of dilutive securities:
 
 
 
 
 
Convertible subordinated debentures
1,348,447

 
2,727,084

 
2,729,514

Convertible senior notes
2,515,067

 
848,164

 
2,904,571

Stock options and deferred compensation agreements
553,312

 
561,898

 
438,834

Denominator for earnings per common share—assuming dilution
65,675,651

 
63,619,495

 
64,579,723

 
 
 
 
 
 
Earnings per common share
$
0.94

 
$
1.45

 
$
0.73

Earnings per common share—assuming dilution
$
0.89

 
$
1.37

 
$
0.68



(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
Year ended December 31, 2012
 
1,522,100

 
$11.35
 
$14.34
Year ended December 31, 2011
 
2,290,200

 
$10.65
 
$14.34
Year ended December 31, 2010
 
1,945,500

 
$8.75
 
$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 December 31, 2012, no shares had been repurchased under this program.