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Earnings Per Share (Tables)
 6 Months Ended
Jun. 30, 2017
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 Ended
 
Six Months Ended
 
June 30,
 
June 30,
 
2017
 
2016
 
2017
 
2016
Numerator:
 
 
 
 
 
 
 
Earnings (loss) from continuing operations - basic
$
(53,918
)
 
$
11,528

 
$
(44,122
)
 
$
19,699

Gain from stock warrant revaluation, net of tax
—

 
(3,664
)
 
—

 
(3,405
)
Earnings (loss) from continuing operations - diluted
$
(53,918
)
 
$
7,864

 
$
(44,122
)
 
$
16,294

 
 
 
 
 
 
 
 
Denominator:
 
 
 
 
 
 
 
Weighted-average shares outstanding - basic
59,035

 
63,267

 
59,084

 
63,452

Common equivalent shares:
 
 
 
 
 
 
 
Effect of stock-based compensation awards
—

 
861

 
—

 
835

Effect of stock warrants
—

 
2,635

 
—

 
1,623

Weighted-average shares outstanding assuming dilution
59,035

 
66,763

 
59,084

 
65,910

 
 
 
 
 
 
 
 
Basic earnings (loss) per share from continuing operations
$
(0.91
)
 
$
0.18

 
$
(0.75
)
 
$
0.31

Diluted earnings (loss) per share from continuing operations
$
(0.91
)
 
$
0.12

 
$
(0.75
)
 
$
0.25