Stock-based Compensation - Phantom Stock Plan (Details) - Phantom Share Units (PSUs) [Member] - Phantom Stock Plan [Member]	12 Months Ended
	Dec. 31, 2020 $ / shares shares
Outstanding, beginning balance (in shares) | shares	109,226
Outstanding, beginning balance (in dollars per share) | $ / shares	$ 21.61
Granted (in shares) | shares	11,912
Granted (in dollars per share) | $ / shares	$ 14.81
Distributions (in shares) | shares	(890)
Distributions (in dollars per share) | $ / shares	$ 11.73
Outstanding, ending balance (in shares) | shares	120,248
Outstanding, ending (in dollars per share) | $ / shares	$ 16.64
Vested at September 30, 2020 (in shares) | shares	120,212
Vested at September 30, 2020 (in dollars per share) | $ / shares	$ 16.64