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Earnings Per Share (Tables)
 3 Months Ended
Mar. 31, 2019
Earnings Per Share [Abstract]  
Schedule of Earnings Per Share, Basic and Diluted The calculation of basic and diluted earnings per share for each period presented was as follows (dollars and shares in thousands, except per share amounts):
 
Three Months Ended
March 31,
 
2019
 
2018
Net income (loss)
$
(7,888
)
 
$
28,066

 
 
 
 
Basic - weighted average shares outstanding
109,643

 
108,423

Dilutive effect of stock options and restricted stock
—

 
2,434

Diluted - weighted average shares outstanding
109,643

 
110,857

 
 
 
 
Earnings (loss) per share
 
 
 
Basic
$
(0.07
)
 
$
0.26

Diluted
$
(0.07
)
 
$
0.25