Represents the number of common units received by holders of notes on pro-rata basis.

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- Definition

The percentage of holders or managers having contractual right to vote or consent to the restructuring support agreement.

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Represents common units received by holders of notes as a percentage of number of outstanding common units.

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No definition available.

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Carrying value as of the balance sheet date of senior PIK notes.

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No definition available.

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Represents the sum of the carrying values as of the balance sheet date of the portions of subsidiary notes payable. Includes deferred issuance costs.

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No definition available.

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Contractual interest rate for funds borrowed, under the debt agreement.

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Amount of cash and cash equivalents restricted as to withdrawal or usage. Cash includes, but is not limited to, currency on hand, demand deposits with banks or financial institutions, and other accounts with general characteristics of demand deposits. Cash equivalents include, but are not limited to, short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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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No definition available.

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Ownership, Nature of Business - The 2018 Restructuring (Details) - USD ($) $ in Thousands		3 Months Ended	12 Months Ended
	Dec. 12, 2018	Mar. 31, 2019	Dec. 31, 2018	Dec. 13, 2018	Mar. 31, 2018	Dec. 31, 2017	Apr. 25, 2017	Dec. 31, 2016	Dec. 31, 2015
Financial assets:
Restricted cash		$ 4,145	$ 4,175
10.75% Senior Secured Notes due 2019 \| Senior secured notes payable
2018 Restructuring
Percent of Holders or Managers, Consent to Restructuring Support Agreement		50.00%	50.00%
12.75% Senior Secured Notes due 2020 \| Senior secured notes payable
2018 Restructuring
Percent of Holders or Managers, Consent to Restructuring Support Agreement		100.00%	100.00%
9.00% Secured Notes due September 2020 \| Senior secured notes payable
2018 Restructuring
Interest rate (as a percent)	9.00%
Percent of Holders or Managers, Consent to Restructuring Support Agreement	9.00%
10.750% senior PIK notes due 2023 \| Senior secured notes payable
2018 Restructuring
Interest rate (as a percent)			10.75%
Debt amount		$ 276,900	$ 276,900
Note, Secured, due April 2019
2018 Restructuring
Subsidiary Note Payable, Including Deferred Issuance Costs			$ 70,000	$ 70,000
Common units A \| 2019 and 2020 Notes \| Senior secured notes payable
2018 Restructuring
Number of common units received on pro-rata basis		850,000	850,000
Common units B
2018 Restructuring
Received Common Units, Percent of Outstanding Common Units	15.00%		15.00%
Common units B \| 2019 and 2020 Notes \| Senior secured notes payable
2018 Restructuring
Number of common units received on pro-rata basis		150,000	150,000
Common Class C \| 2019 and 2020 Notes \| Senior secured notes payable
2018 Restructuring
Number of common units received on pro-rata basis		52,631.6	52,631.6
Predecessor
Financial assets:
Restricted cash					$ 4,420	$ 4,585		$ 3,015	$ 3,460
Predecessor \| 10.75% Senior Secured Notes due 2019 \| Senior secured notes payable
2018 Restructuring
Interest rate (as a percent)	10.75%					10.75%
Predecessor \| 12.75% Senior Secured Notes due 2020
2018 Restructuring
Interest rate (as a percent)			12.75%
Predecessor \| 12.75% Senior Secured Notes due 2020 \| Senior secured notes payable
2018 Restructuring
Interest rate (as a percent)	12.75%					12.75%
Predecessor \| Note, Secured, due April 2019
2018 Restructuring
Subsidiary Note Payable, Including Deferred Issuance Costs				$ 63,500			$ 63,500