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

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Employee Stock Purchase Plan [Abstract]

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- Definition

Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, First and Second Anniversary, Percentage

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Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Rights, Third Anniversary, Percentage

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No definition available.

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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SAB TOPIC 14.F)
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-Publisher SEC
-Name Staff Accounting Bulletin (SAB)
-Number Topic 14
-Section F

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- References

No definition available.

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- Definition

The funded status is measured as the difference between the fair value of plan assets and the benefit obligation. Will normally be the same as the net Defined Benefit Plan, Amounts Recognized in Balance Sheet, Total.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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No definition available.

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The amount of the cost recognized during the period for defined contribution plans.

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- Definition

Unrecognized cost of unvested share-based compensation awards.

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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 10
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- References

No definition available.

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Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

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- Definition

The aggregate amount of expenditures for salaries, wages, profit sharing and incentive compensation, and other employee benefits, including equity-based compensation, and pension and other postretirement benefit expense.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.4)
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The amount of pension benefit costs recognized during the period for (1) defined benefit plans and (2) defined contribution plans. For defined benefit plans, pension expense includes the following components: service cost, interest cost, expected return on plan assets, gain (loss) on plan assets, prior service cost or credit, transition asset or obligation, and gain (loss) due to settlements or curtailments. For defined contribution plans, the pension expense generally equals the firm's contribution to employees' accounts (if the firm contributes) during the period.

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-Publisher FASB
-Name Accounting Standards Codification
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- Definition

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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- 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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No definition available.

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- Definition

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

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-Name Accounting Standards Codification
-Topic 718
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-Paragraph 2
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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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Reference 1: http://www.xbrl.org/2003/role/presentationRef
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-SubTopic 10
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-Paragraph 2
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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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- Definition

Percentage of vesting of share-based compensation awards.

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-Name Accounting Standards Codification
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- Definition

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

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No definition available.

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- Definition

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

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-Name Accounting Standards Codification
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-Section 50
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-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 29, 30
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STOCK OWNERSHIP AND BENEFIT PLANS - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended	12 Months Ended			112 Months Ended
	Mar. 31, 2013	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2015
Stock ownership and benefit plans [Line Items]
Number of shares authorized		1,617,500			1,617,500
Number of shares available for future grant		201,140			201,140
Expenses associated with management retirements	$ 2,965
Stock-based compensation	$ 894
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		$ 526	$ 523	$ 485
Defined Benefit Plans [Abstract]
Unfunded pension obligation		1,009	1,143		$ 1,009
Net adjustments recognized		$ (16)	349	67
Employee Stock Purchase Plan [Member]
Stock ownership and benefit plans [Line Items]
Number of shares authorized		600,000			600,000
Number of shares available for future grant		81,872			81,872
Stock-based compensation		$ 86	$ 92	$ 76
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		33,346	20,148	22,689
Employee Stock Purchase Plan [Member] \| Maximum [Member]
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%
Restricted stock and restricted stock units
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted					1,416,360
Restricted stock [Member]
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted		148,972	157,680	163,579
Unrecognized stock-based compensation [Abstract]
Unrecognized stock-based compensation cost related to unvested awards		$ 1,558			$ 1,558
Weighted average period over which the cost is expected to be recognized		1 year 3 months 7 days
Restricted stock units [Member]
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted		50,167	33,895	56,217
Unrecognized stock-based compensation [Abstract]
Unrecognized stock-based compensation cost related to unvested awards		$ 670			$ 670
Weighted average period over which the cost is expected to be recognized		1 year 6 months
Restricted stock awards and restricted stock units, time-based
Stock ownership and benefit plans [Line Items]
Vesting percentage		33.33%
Restricted stock awards and restricted stock units, performance-based
Stock ownership and benefit plans [Line Items]
Vesting percentage, first and second anniversary		25.00%
Vesting percentage, third anniversary		50.00%