Equity Based Compensation and Profit Interest Awards - LTIP (Details) - USD ($)	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Aug. 10, 2017
Restricted shares
Long-term Incentive Plan
Total value of grant	$ 200,000
Maximum amortization of grant	10,000
Unrecognized expense	$ 300,000
Number of units
Outstanding at the beginning (in units)	10,000
Granted	24,000
Outstanding at the end (in units)	34,000
Weighted average grant date fair value
Outstanding at the beginning (in dollars per share)	$ 9.43
Granted	8.14
Outstanding at the end (in dollars per share)	$ 8.52
Weighted average remaining vesting period
Granted	3 years
Outstanding (in years)	2 years 10 months 24 days	2 years 8 months 12 days
LTIP
Long-term Incentive Plan
Awards granted (in shares)	34,000
Class A Common Stock | LTIP
Long-term Incentive Plan
Common shares reserved for issuance			1,250,000