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Stock Compensation (Tables)
 3 Months Ended
Mar. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Assumptions used to compute the current fair value of cash settled-SARs The following table summarizes the assumptions used to compute the current fair value of our cash-settled SARs:
 
 
March 31, 2018 (1)
 
December 30, 2017 (2)
Stock price
 
$
32.59

 
$
9.76

Expected volatility
 
125.57
%
 
33.80
%
Risk-free interest rate
 
1.77
%
 
1.55
%
Expected term (in years)
 
0.29

 
0.54

Expected dividend yield
 
Not applicable

 
Not applicable


(1) Reflects an assumed exercise price based on the 20-trading day average, as per the amended SARs Agreement. The 20-day trading average was based on the 20 days prior to the last trading day of the fiscal quarter, inclusive of the last trading day.
(2) Reflects an assumed exercise price based on the closing stock price, as per the original SARs Agreement. The closing stock price used in the analysis was the closing stock price on the last trading day of the fiscal quarter.