Annual and transition report of foreign private issuers pursuant to Section 13 or 15(d)

Share-Based Payment (Schedule of Black-Scholes Options Pricing Model) (Details)

v3.19.1
Share-Based Payment (Schedule of Black-Scholes Options Pricing Model) (Details) - yr
1 Months Ended 12 Months Ended
Mar. 18, 2015
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Dividend yield 33.00% 0.00% 0.00% 0.00%
Expected volatility   0.384% 0.342% 0.332%
Risk-free interest   2.67% 1.34% 0.67%
Bottom of range [Member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Expected life (in years)   2 2 2
Top of range [member]        
Disclosure of terms and conditions of share-based payment arrangement [line items]        
Expected life (in years)   3 3 3