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Share-Based Compensation (Tables)
12 Months Ended
Dec. 31, 2018
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]  
Summary of Share - Based Awards

    Restricted Stock Units
    Number of Units                
    Management     Directors    

Weighted

Average

Fair Value

on Grant

Date

   

Actual

Fair

Value on

Vesting

Date

 
Unvested as at January 1, 2016     37,500           $ 26.00     n/a  
Granted in March 3, 2016     25,000             9.44     n/a  
Unvested as at December 31, 2016     62,500           $ 19,36     n/a  
Granted in 2017                     n/a  
Unvested as at December 31, 2017     62,500           $ 19.36     n/a  
Granted in January 8, 2018     25,000             9.28     n/a  
Granted in March 1, 2018     25,000             9.04     n/a  
Vested on November 15, 2018     (112,500           n/a     7.92  
Unvested as at December 31, 2018               $