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Per Share Data (Tables)
3 Months Ended
Mar. 31, 2018
Earnings Per Share [Abstract]  
Schedule of antidilutive securities excluded from computation of earnings per share
The Company incurred losses for the three months ended March 31, 2018 and 2017 and as a result, the equity instruments listed below are excluded from the calculation of diluted earnings (loss) per share as the effect of the exercise, conversion or vesting of such instruments would be anti-dilutive. The weighted average number of equity instruments excluded consists of:
 
Three months ended March 31,
 
2018
 
2017
Stock Options
1,062,467

 
1,709,967

Stock-Settled Stock Appreciation Rights
162,393

 
360,031

Restricted Stock Units
1,472,001

(1)
1,307,464

Warrants
2,690,950

 
2,690,950