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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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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Aggregate carrying value as of the balance sheet date of the liabilities for all deferred compensation arrangements payable beyond one year (or the operating cycle, if longer).

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Carrying amount as of the balance sheet date of assets held under deferred compensation agreements.

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

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Number of shares authorized for issuance under share-based payment arrangement.

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Percentage of vesting of award under share-based payment arrangement.

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

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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			38 Months Ended	129 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2019	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	2,698,447			2,698,447	3,360,119
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	$ 1,156	$ 828	$ 511
Deferred Compensation Arrangements [Abstract]
Deferred compensation plan assets	4,461			$ 4,461
Deferred compensation obligations to be settled in cash	6,090			6,090
Defined Benefit Plans [Abstract]
Unfunded pension obligation	2,079	1,708		$ 2,079
Net adjustments recognized	$ 406	$ 406	$ 10
Restricted stock and restricted stock units
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted				661,672	1,639,881
Restricted stock units
Stock ownership and benefit plans [Line Items]
Common stock conversion ratio (in shares)	1
Performance Shares
Stock ownership and benefit plans [Line Items]
Aggregate number of shares granted	17,640	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%
Employee stock
Stock ownership and benefit plans [Line Items]
Number of shares authorized	850,000			850,000
Number of shares available for future grant	224,812			224,812
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	16,553	18,100	26,519
Stock-based compensation	$ 159	$ 121	$ 92
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%