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Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member]
 12 Months Ended
Dec. 31, 2019
$ / shares
shares
Outstanding, beginning balance (in shares) | shares 99,313
Outstanding, beginning balance (in dollars per share) | $ / shares $ 21.53
Granted (in shares) | shares 11,336
Granted (in dollars per share) | $ / shares $ 21.93
Distributions (in shares) | shares (1,423)
Distributions (in dollars per share) | $ / shares $ 21.92
Outstanding, ending balance (in shares) | shares 109,226
Outstanding, ending (in dollars per share) | $ / shares $ 21.61
Vested at December 31, 2018 (in shares) | shares 108,974
Vested at December 31, 2018 (in dollars per share) | $ / shares $ 21.61