Represents the first level of employee contributions (percentage of compensation) which are matched by the employer.

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Represents the second level of employee contributions (percentage of compensation) which are partially matched by the employer.

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Represents the employer matching contribution of the first level of qualified compensation.

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Employee Stock Purchase Plan [Abstract]

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Share-Based Compensation Arrangement By Share-Based Payment Award, Equity Instrument Other Than Options, Common Stock Conversion Ratio

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Share-based Compensation By Share-based Payment Award, Common Stock Earned As A Percentage of Targeted Performance Stock Units

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- Definition

Represents the expense recognized during the period arising from equity-based compensation arrangements (for example, shares of stock, unit, stock options or other equity instruments) with employees, directors and certain consultants qualifying for treatment as employees.

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No definition available.

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Amount of funded (unfunded) status of defined benefit plan, measured as difference between fair value of plan assets and benefit obligation. Includes, but is not limited to, overfunded (underfunded) status.

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Amount of cost for defined contribution plan.

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Amount of cost (reversal of cost) for pension benefits. Excludes other postretirement benefits.

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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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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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The highest percentage of annual salary that an employee is permitted to utilize with respect to the plan.

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The maximum number of shares (or other type of equity) originally approved (usually by shareholders and board of directors), net of any subsequent amendments and adjustments, for awards under the equity-based compensation plan. As stock or unit options and equity instruments other than options are awarded to participants, the shares or units remain authorized and become reserved for issuance under outstanding awards (not necessarily vested).

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The difference between the maximum number of shares (or other type of equity) authorized for issuance under the plan (including the effects of amendments and adjustments), and the sum of: 1) the number of shares (or other type of equity) already issued upon exercise of options or other equity-based awards under the plan; and 2) shares (or other type of equity) reserved for issuance on granting of outstanding awards, net of cancellations and forfeitures, if applicable.

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Percentage of vesting of share-based compensation awards.

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Purchase price of common stock expressed as a percentage of its fair value.

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No definition available.

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Number of shares issued during the period as a result of an employee stock purchase plan.

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STOCK OWNERSHIP AND BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands	12 Months Ended			14 Months Ended	129 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2017	Sep. 21, 2016	Nov. 04, 2016
Stock ownership and benefit plans [Line Items]
Number of shares authorized						5,000,000
Number of shares available for future grant	2,981,524			2,981,524	3,360,119
Employee Stock Purchase Plan [Abstract]
Stock-based compensation	$ 2,975	$ 2,400	$ 3,362
401(k) Plan [Abstract]
Matching employer contributions on first level of qualified compensation (as a percent)	100.00%
Percentage of qualified compensation, first level, matched by employer	3.00%
Matching employer contributions on second level of qualified compensation (as a percent)	50.00%
Percentage of qualified compensation, second level, matched by employer	2.00%
Total DMC contributions	$ 511	455	526
Defined Benefit Plans [Abstract]
Unfunded pension obligation	1,374	1,197		$ 1,374
Net adjustments recognized	$ 10	$ 235	$ (16)
Restricted stock and restricted stock units
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted				379,095	1,639,881
Performance Shares
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted	23,000
Common stock conversion ratio (in shares)	1
Performance Shares \| Minimum
Stock ownership and benefit plans [Line Items]
Eligible shares of common stock earned as a percentage of targeted PSUs awarded	0.00%
Performance Shares \| Maximum
Stock ownership and benefit plans [Line Items]
Eligible shares of common stock earned as a percentage of targeted PSUs awarded	200.00%
Restricted stock units
Stock ownership and benefit plans [Line Items]
Common stock conversion ratio (in shares)	1
Employee stock
Stock ownership and benefit plans [Line Items]
Number of shares authorized	850,000			850,000
Number of shares available for future grant	259,465			259,465
Employee Stock Purchase Plan [Abstract]
Percentage of earnings that may be authorized by employees to withhold to purchase common stock	15.00%			15.00%
Shares purchased	26,519	45,888	33,346
Stock-based compensation	$ 92	$ 54	$ 89
Employee stock \| Maximum
Employee Stock Purchase Plan [Abstract]
Percentage of fair market value of the entity's common stock used to purchase common stock on the Offering Date or Purchase Date	85.00%
First anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage	33.33%
First anniversary \| Restricted stock awards and restricted stock units, time and performance-based
Stock ownership and benefit plans [Line Items]
Vesting percentage	25.00%
Second anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage	33.33%
Second anniversary \| Restricted stock awards and restricted stock units, time and performance-based
Stock ownership and benefit plans [Line Items]
Vesting percentage	25.00%
Third anniversary \| Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage	33.33%
Third anniversary \| Restricted stock awards and restricted stock units, time and performance-based \| Maximum
Stock ownership and benefit plans [Line Items]
Vesting percentage	50.00%