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Earnings Per Common Share (Tables)
 12 Months Ended
Dec. 31, 2016
Earnings Per Share [Abstract]  
Schedule of basic and diluted EPS calculations
The basic and diluted EPS calculations for the years ended December 31, 2016, 2015 and 2014 are presented below:
 
 
Year Ended December 31,
(in thousands, except per share amounts)
 
2016
 
2015
 
2014
Income (loss) attributable to common stockholders
 
$
30,880

 
$
(4,831
)
 
$
94,032

 
 
 
 
 
 
 
Weighted average common shares outstanding, basic
 
66,055

 
41,260

 
38,828

Effect of dilutive securities:
 
 
 
 
 
 
Restricted stock
 
207

 
—

 
463

Restricted stock units
 
129

 
—

 
—

Stock options
 
218

 
—

 
—

Weighted average common shares outstanding, diluted
 
66,609

 
41,260

 
39,291

 
 
 
 
 
 
 
Basic income (loss) per common share
 
$
0.47

 
$
(0.12
)
 
$
2.42

Diluted income (loss) per common share
 
$
0.46

 
$
(0.12
)
 
$
2.39
Schedule of anti-dilutive securities excluded from computation of earnings per share
The following table provides the securities that could potentially dilute EPS in the future, but were not included in the computation of diluted EPS because to do so would have been anti-dilutive. The amounts included in this table exclude performance-based restricted stock units. The number of currently outstanding performance-based restricted stock units that are issued upon vesting could range from zero to a maximum of 206,250.
 
 
Year Ended December 31,
(in thousands)
 
2016
 
2015
 
2014
Stock options
 
469

 
1,228

 
—

Restricted stock
 
—

 
455

 
—

Restricted stock units
 
5

 
282

 
—