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Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member]
 3 Months Ended
Mar. 31, 2021
$ / shares
shares
Outstanding, beginning balance (in shares) | shares 120,248
Outstanding, beginning balance (in dollars per share) | $ / shares $ 16.64
Granted (in shares) | shares 7,828
Granted (in dollars per share) | $ / shares $ 19.15
Distributions (in shares) | shares (1,389)
Distributions (in dollars per share) | $ / shares $ 16.84
Outstanding, ending balance (in shares) | shares 126,687
Outstanding, ending (in dollars per share) | $ / shares $ 21.23
Vested at March 31, 2021 (in shares) | shares 126,566
Vested at March 31, 2021 (in dollars per share) | $ / shares $ 21.23