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Earnings (Loss) Per Share and Stockholders' Equity (Tables)
 6 Months Ended
Jun. 30, 2017
Earnings Per Share [Abstract]  
Schedule of Earnings (Loss) Per Share, Basic and Diluted
The following table sets forth the computation of earnings (loss) per common share and earnings (loss) per common share - assuming dilution:
 
Three Months Ended 
 June 30,
 
Six Months Ended 
 June 30,
 
2017
 
2016
 
2017
 
2016
 
(Dollars in thousands, except per share data)
Numerator:
 
 
 
 
 
 
 
Net income (loss) - numerator for earnings (loss) per common share
$
26,946

 
$
14,708

 
$
80,885

 
$
(30,133
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted average common shares outstanding (1)
88,897,203

 
82,516,927

 
88,772,831

 
82,322,919

Effect of dilutive securities:
 
 
 
 
 
 
 
2015 warrants
—

 
—

 
—

 
30,439

Stock options and deferred compensation agreements
850,870

 
353,052

 
899,594

 
422,809

Restricted stock and restricted stock units
364,211

 
314,158

 
372,214

 
296,649

Denominator for earnings (loss) per common share - assuming dilution
90,112,284

 
83,184,137

 
90,044,639

 
83,072,816

 
 
 
 
 
 
 
 
Earnings (loss) per common share
$
0.30

 
$
0.18

 
$
0.91

 
$
(0.37
)
Earnings (loss) per common share - assuming dilution
$
0.30

 
$
0.18

 
$
0.90

 
$
(0.37
)


(1)
Weighted average common shares outstanding include shares vested under the NMO Deferred Compensation Plan.
Schedule of Antidilutive Securities Excluded from Computation of Earnings (Loss) 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 (loss) 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 June 30, 2017
 
1,002,391
 
$24.79
 
$24.79
Three months ended June 30, 2016
 
1,061,541
 
$24.79
 
$24.79
Six months ended June 30, 2017
 
1,002,391
 
$24.79
 
$24.79
Six months ended June 30, 2016
 
1,061,541
 
$24.79
 
$24.79