Period which an employee's right to exercise an award is no longer contingent on satisfaction of either a service condition, market condition or a performance condition, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The number of non-vested equity-based payment instruments, excluding stock (or unit) options, that validly exist and are outstanding as of the balance sheet date.

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A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.

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The weighted average fair value of nonvested awards on equity-based plans excluding option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, revenue or profit achievement stock award plan) for which the employer is contingently obligated to issue equity instruments or transfer assets to an employee who has not yet satisfied service or performance criteria necessary to gain title to proceeds from the sale of the award or underlying shares or units.

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Weighted average remaining contractual term for equity-based awards excluding options, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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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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Intrinsic value of equity-based compensation awards outstanding. Excludes stock and unit options.

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Stock-Based Compensation - Restricted Stock Unit Grants (Details) - RSU's - 2018 Plan - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Dec. 31, 2018
Number of Shares
Balance at the beginning of the period (in shares)	893,297
Shares granted		0
Shares forfeited	(48,000)
Balance at the end of the period (in shares)	845,297		893,297
Weighted Average Grant Date Fair Value
Balance at the beginning of the period	$ 5.86
Balance at the end of the period	$ 6.12		$ 5.86
Average Remaining Contractual Life (Years)
Weighted average remaining contractual life (in years)	6 months 18 days		9 months 4 days
Aggregate Intrinsic Value
Aggregate intrinsic value outstanding	$ 4,952		$ 5,239
Minimum
Stock-Based Compensation
Vesting period	1 year
Maximum
Stock-Based Compensation
Vesting period	2 years