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Share-Based Compensation - Schedule of Activity for Restricted Stock Units (Details) - Restricted Stock Units (RSUs) - USD ($)
$ / shares in Units, $ in Thousands
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Dec. 31, 2017
Number of Shares      
Unvested, Beginning Balance 52,064 116,489  
Vested (52,064) (62,252)  
Forfeited   (2,173)  
Unvested, Ending Balance   52,064  
Weighted Average Grant Date Fair Value      
Beginning Balance   $ 63.92 $ 60.22
Vested $ 82.23 57.00  
Forfeited   $ 63.92  
Grant Date Fair Value of Restricted Stock that Vested During the Year      
Vested $ 4,311 $ 5,127