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Earnings (Loss) Per Share (Tables)
 12 Months Ended
Dec. 31, 2018
Earnings Per Share [Abstract]  
Components of basic and diluted earnings per common share A reconciliation of the number of shares used for the basic and diluted earnings (loss) per common share computations is as follows (in thousands):
 
Year ended December 31,
 
2018
 
2017
 
2016
Weighted average common shares outstanding - Basic
57,995

 
57,580

 
56,087

Assumed conversions:
 
 
 
 
 
Incremental common shares from stock options
—

 
—

 
—

Incremental common shares from restricted stock units
—

 
—

 
—

Weighted average common shares outstanding - Diluted
57,995

 
57,580

 
56,087