XML 18 R111.htm IDEA: XBRL DOCUMENT v3.20.1
Share-Based Compensation - Summary of Non-vested Time-Based Restricted Stock Units Outstanding (Details) - Time Based Restricted Stock Units - $ / shares
12 Months Ended
Dec. 31, 2019
Dec. 31, 2018
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]    
Number of Shares, Non-vested at beginning of year 6,777  
Number of Shares, Granted 8,132 7,839
Number of Shares, Vested (2,251) (225)
Number of Shares, Forfeited   (837)
Number of Shares, Non-vested at end of year 12,658 6,777
Weighted Average Grant Value, Non-vested at beginning of year $ 76.56  
Weighted Average Grant Value, Granted 73.00 $ 76.56
Weighted Average Grant Value, Vested 76.56 76.56
Weighted Average Grant Value, Forfeited   76.56
Weighted Average Grant Value, Non-vested at end of year $ 74.27 $ 76.56