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Earnings Per Share and Stockholders' Equity (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The following table sets forth the computation of earnings per common share and earnings per common share—assuming dilution:
 
Year Ended December 31,
 
2016
 
2015
 
2014
 
(Dollars in thousands, except per share data)
Numerator:
 
 
 
 
 
Net income—numerator for earnings per common share
$
83,243

 
$
219,830

 
$
126,023

 
 
 
 
 
 
Denominator:
 
 
 
 
 
Weighted average common shares outstanding (1)
84,793,151

 
78,936,828

 
74,431,087

Effect of dilutive securities:
 
 
 
 
 
Convertible senior notes
—

 
—

 
2,657,158

Equity forward sale agreements
—

 
67,575

 
—

2015 warrants
15,136

 
759,723

 
1,559,646

Stock options and deferred compensation agreements
456,236

 
1,040,922

 
1,178,783

Restricted stock and restricted stock units
340,646

 
155,520

 
66,926

Denominator for earnings per common share—assuming dilution
85,605,169

 
80,960,568

 
79,893,600

 
 
 
 
 
 
Earnings per common share
$
0.98

 
$
2.78

 
$
1.69

Earnings per common share—assuming dilution
$
0.97

 
$
2.72

 
$
1.58


(1)
Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan and exclude unallocated shares held by the ESOP.
Schedule of Antidilutive Securities Excluded from Computation of Earnings Per Share
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, 2016
 
1,054,091
 
$24.79
 
$24.79
Year ended December 31, 2015
 
1,061,541
 
$24.79
 
$24.79
Year ended December 31, 2014
 
1,215,450
 
$24.79
 
$24.79