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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
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,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Net income (loss) attributable to common shareholders
$
54,079

 
$
39,488

 
$
74,465

 
$
49,499

Less: dividends paid on unvested share-based compensation
(83
)
 
(104
)
 
(166
)
 
(207
)
Undistributed earnings attributable to share-based compensation
(88
)
 
(52
)
 
(69
)
 
—

Net income (loss) available to common shareholders
$
53,908

 
$
39,332

 
$
74,230

 
$
49,292

Denominator:
 
 
 
 
 
 
 
Weighted-average number of common shares — basic
68,912,185

 
69,168,788

 
68,894,413

 
70,383,149

Effect of dilutive share-based compensation
292,386

 
299,566

 
332,685

 
323,653

Weighted-average number of common shares — diluted
69,204,571

 
69,468,354

 
69,227,098

 
70,706,802

 
 
 
 
 
 
 
 
Net income (loss) per share available to common shareholders — basic
$
0.78

 
$
0.57

 
$
1.08

 
$
0.70

Net income (loss) per share available to common shareholders — diluted
$
0.78

 
$
0.57

 
$
1.07

 
$
0.70