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Earnings (Loss) Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Computations of Class A Basic and Diluted Earnings (Loss) per Share
The computations for Class A basic and diluted earnings per share are as follows (in thousands except share data):
 
Three months ended June 30,
 
Six months ended June 30,
 
2018
 
2017
 
2018
 
2017
Numerator for basic and diluted earnings per share:
 
 
 
 
 
 
 
Net earnings attributable to controlling interest
$
32,718

 
$
14,220

 
$
168,640

 
$
19,873

Less: earnings allocated to participating securities
(40
)
 
(26
)
 
(157
)
 
(48
)
Numerator for basic EPS - net income attributable to common stockholders
$
32,678

 
$
14,194

 
$
168,483

 
$
19,825

Add back allocation of earnings to participating securities
40

 
26

 
157

 
48

Add back convertible senior notes interest
—

 
—

 
7,480

 
—

Reallocation of earnings to participating securities considering potentially dilutive securities
(40
)
 
(26
)
 
(148
)
 
(48
)
Numerator for diluted earnings per share - net income attributable to common stockholders
$
32,678

 
$
14,194

 
$
175,972

 
$
19,825

 
 
 
 
 
 
 
 
Denominator for earnings per share:
 
 
 
 
 
 
 
Weighted average number of shares:
 
 
 
 
 
 
 
Class A common stock - basic
97,459,472

 
87,065,591

 
97,444,016

 
87,064,110

Add dilutive effect of:
 
 
 
 
 
 
 
Stock options
—

 
7,488

 
—

 
—

Restricted stock awards
36,348

 
144,302

 
47,886

 
185,366

Restricted stock units
397

 
—

 
45

 
7,654

Convertible senior notes
—

 
—

 
8,170,740

 
—

Class A common stock - diluted
97,496,217

 
87,217,381

 
105,662,687

 
87,257,130

 
 
 
 
 
 
 
 
Earnings per share:
 
 
 
 
 
 
 
Class A common stock:
 
 
 
 
 
 
 
Basic
$
0.34

 
$
0.16

 
$
1.73

 
$
0.23

Diluted
$
0.34

 
$
0.16

 
$
1.67

 
$
0.23

 
 
 
 
 
 
 
 
Dividends declared per Class A common share
$
0.42

 
$
0.42

 
$
0.84

 
$
0.83