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Debt Obligations, Related Party Financing (Details) - USD ($) $ in Thousands	1 Months Ended	3 Months Ended	9 Months Ended		12 Months Ended
	Jan. 31, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017	Dec. 31, 2017
Debt Obligations
Repayment of debt			$ 50,000
Outstanding principal balance of related party financing					$ 50,000
ACM / Our "Former Manager"
Debt Obligations
Outstanding principal balance of related party financing	$ 50,000
Interest expense		$ 1,000	300	$ 2,900
Preferred equity interest financing agreement | ACM / Our "Former Manager"
Debt Obligations
Principal amount					$ 50,000
Maturity period (in years)					5 years
Repayment of debt	$ 50,000
Outstanding principal balance of related party financing					$ 50,000
Interest expense		$ 1,000	$ 300	$ 2,900

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- Definition

Face (par) amount of debt instrument at time of issuance.

+ References

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-Publisher FASB
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-Topic 835
-SubTopic 30
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- Definition

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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- Definition

Period of time between issuance and maturity of debt instrument, in PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Amount of interest expense incurred on a debt or other obligation to related party.

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- Definition

The amount for notes payable (written promise to pay), due to related parties.

+ References

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The cash outflow for the payment of a long-term borrowing made from a related party where one party can exercise control or significant influence over another party; including affiliates, owners or officers and their immediate families, pension trusts, and so forth. Alternate caption: Payments for Advances from Affiliates.

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