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Earnings Per Share (Tables)
 6 Months Ended
Jun. 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 June 30,
 
For the six months ended June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Net income (loss) attributable to common shareholders
$
39,488

 
$
69,949

 
$
49,499

 
$
76,515

Less: dividends paid on unvested share-based compensation
(104
)
 
(120
)
 
(207
)
 
(241
)
Undistributed earnings attributable to share-based compensation
(52
)
 
(185
)
 
—

 
(92
)
Net income (loss) available to common shareholders
$
39,332

 
$
69,644

 
$
49,292

 
$
76,182

Denominator:
 
 
 
 
 
 
 
Weighted-average number of common shares — basic
69,168,788

 
71,922,904

 
70,383,149

 
71,879,859

Effect of dilutive share-based compensation
299,566

 
396,880

 
323,653

 
493,517

Weighted-average number of common shares — diluted
69,468,354

 
72,319,784

 
70,706,802

 
72,373,376

 
 
 
 
 
 
 
 
Net income (loss) per share available to common shareholders — basic
$
0.57

 
$
0.97

 
$
0.70

 
$
1.06

Net income (loss) per share available to common shareholders — diluted
$
0.57

 
$
0.96

 
$
0.70

 
$
1.05