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Earnings (Loss) Per Share and Stockholders' Equity (Tables)
 3 Months Ended
Mar. 31, 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 
 March 31,
 
2017
 
2016
 
(Dollars in thousands, except per share data)
Numerator:
 
 
 
Net income (loss) - numerator for earnings (loss) per common share
$
53,939

 
$
(44,841
)
 
 
 
 
Denominator:
 
 
 
Weighted average common shares outstanding (1)
88,647,078

 
82,128,911

Effect of dilutive securities:
 
 
 
2015 warrants
—

 
60,878

Stock options and deferred compensation agreements
948,317

 
492,567

Restricted stock and restricted stock units
380,217

 
279,139

Denominator for earnings (loss) per common share - assuming dilution
89,975,612

 
82,961,495

 
 
 
 
Earnings (loss) per common share
$
0.61

 
$
(0.55
)
Earnings (loss) per common share - assuming dilution
$
0.60

 
$
(0.55
)


(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 March 31, 2017
 
—
 
$—
 
$—
Three months ended March 31, 2016
 
1,061,541
 
$24.79
 
$24.79