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Earnings Per Share (Tables)
 9 Months Ended
Sep. 30, 2017
Earnings Per Share [Abstract]  
Reconciliation of basic and diluted earnings per common share
The following is a reconciliation of basic and diluted earnings per common share (in thousands, except share and per-share data):
 
For the three months ended September 30,
 
For the nine months ended September 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income (loss) attributable to common shareholders
$
26,420

 
$
(43,897
)
 
$
75,919

 
$
32,618

Less: dividends paid on unvested share-based compensation
(104
)
 
(121
)
 
(311
)
 
(362
)
Undistributed earnings attributable to share-based compensation
—

 
—

 
—

 
—

Net income (loss) available to common shareholders
$
26,316

 
$
(44,018
)
 
$
75,608

 
$
32,256

Denominator:
 
 
 
 
 
 
 
Weighted-average number of common shares — basic
68,814,805

 
71,922,904

 
69,854,618

 
71,894,313

Effect of dilutive share-based compensation
388,115

 
—

 
373,456

 
482,036

Weighted-average number of common shares — diluted
69,202,920

 
71,922,904

 
70,228,074

 
72,376,349

 
 
 
 
 
 
 
 
Net income (loss) per share available to common shareholders — basic
$
0.38

 
$
(0.61
)
 
$
1.08

 
$
0.45

Net income (loss) per share available to common shareholders — diluted
$
0.38

 
$
(0.61
)
 
$
1.08

 
$
0.45