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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2018
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted
The calculation of basic and diluted earnings per common share are as follows (in thousands, except per share amounts):
 
Three Months Ending
 
Six Months Ending
 
June 30,
 
June 30,
 
2018
 
2017
 
2018
 
2017
Numerator:
 
 
 
 
 
 
 
Earnings (loss) from continuing operations - basic
$
24,464

 
$
(53,918
)
 
$
40,146

 
$
(44,122
)
Gain from stock warrants revaluation, net of tax
(10,448
)
 
—

 
(7,473
)
 
—

Earnings (loss) from continuing operations - diluted
$
14,016

 
$
(53,918
)
 
$
32,673

 
$
(44,122
)
 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding for basic earnings per share
58,739

 
59,035

 
58,790

 
59,084

Common equivalent shares:
 
 
 
 
 
 
 
Effect of stock-based compensation awards and warrants
9,624

 
—

 
9,994

 
—

Weighted-average shares outstanding assuming dilution
68,363

 
59,035

 
68,784

 
59,084

Basic earnings per share from continuing operations
$
0.42

 
$
(0.91
)
 
$
0.68

 
$
(0.75
)
Diluted earnings per share from continuing operations
$
0.21

 
$
(0.91
)
 
$
0.48

 
$
(0.75
)