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SHAREHOLDERS' EQUITY - Narrative (Details) $ in Millions | 1 Months Ended | 2 Months Ended | 3 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) plan shares | Oct. 31, 2018 Installment shares | Feb. 29, 2016 Installment shares | Jul. 31, 2015 Installment shares | Nov. 30, 2011 Installment shares | Aug. 31, 2010 Installment shares | Nov. 30, 2017 Installment shares | Mar. 31, 2012 Installment shares | Dec. 31, 2018 USD ($) plan shares | Dec. 31, 2017 USD ($) director shares | Dec. 31, 2016 USD ($) shares | Apr. 30, 2018 shares | Oct. 31, 2017 Installment shares | Dec. 31, 2015 shares
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of compensation plans | plan | 2 |  |  |  |  |  |  |  | 2 |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.9 | $ 1.6 | $ 1.6 |  |  |
Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of options outstanding (in shares) | 596,148 |  |  |  |  |  |  |  | 596,148 | 1,001,300 | 1,410,250 |  |  | 954,625
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.3 | $ 1.1 | $ 0.7 |  |  |
Share based compensation cost, future income tax benefits | $ |  |  |  |  |  |  |  |  | 0.1 | 0.2 | 0.3 |  |  |
Total intrinsic value of options exercised | $ |  |  |  |  |  |  |  |  | 9.5 | 1.3 | 0.0 |  |  |
Unrecognized compensation costs, unvested stock options | $ | $ 0.5 |  |  |  |  |  |  |  | $ 0.5 |  |  |  |  |
Weighted average period of recognition |  |  |  |  |  |  |  |  | 1 year 9 months |  |  |  |  |
Total fair value of stock options vested | $ |  |  |  |  |  |  |  |  | $ 1.2 | 0.9 | 0.6 |  |  |
Employee Stock Option | ETG |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | 0.4 | 0.0 | 0.1 |  |  |
Acceleration of stock options due to sale of business | $ |  |  |  |  |  |  |  |  | 0.3 |  |  |  |  |
Employee Stock Option | NATG |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  |  |  | 0.0 |  |  |
Restricted Stock Units (RSUs) | Key Employee | Granted November 2011 | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | 0.2 | 0.1 | 0.1 |  |  |
Restricted Stock Units (RSUs) | Key Employee | Grant February 2016 | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.1 | 0.2 | 0.5 |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unvested, will accelerate and vest (in shares) | 16,666 |  |  |  |  |  |  |  | 16,666 |  |  |  |  |
Restricted Stock Units (RSUs) | Two Key Employees | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.1 | 0.1 | 0.1 |  |  |
Restricted Stock Units (RSUs) | Director | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.1 | $ (0.1) | 0.1 |  |  |
1999 Long-term Stock Incentive Plan, as amended |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | 7,500,000 |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  |  |  | 3,000,000 |  |  |  |  |
1999 Long-term Stock Incentive Plan, as amended | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Number of options outstanding (in shares) | 50,000 |  |  |  |  |  |  |  | 50,000 |  |  |  |  |
2010 Long-term Stock Incentive Plan |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares authorized for issuance (in shares) | 7,500,000 |  |  |  |  |  |  |  | 7,500,000 |  |  |  |  |
2010 Long-term Stock Incentive Plan | Employee Stock Option |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of shares granted per calendar year in total, maximum (in shares) |  |  |  |  |  |  |  |  | 1,500,000 |  |  |  |  |
Number of options outstanding (in shares) | 546,148 |  |  |  |  |  |  |  | 546,148 |  |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted stock outstanding (in shares) | 132,484 |  |  |  |  |  |  |  | 132,484 |  |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.0 |  | 0.0 |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) |  | 5,117 | 100,000 | 23,620 | 100,000 |  | 53,288 |  |  |  |  |  |  |
Number of vesting installments | Installment |  | 4 | 3 | 4 | 10 |  |  |  |  |  |  |  | 2 |
Number of units vesting annually (in shares) |  |  |  | 5,905 | 10,000 |  | 49,600 |  |  |  |  |  |  |
Unvested, will accelerate and vest (in shares) |  |  |  |  | 30,000 |  |  |  |  |  |  |  |  |
Number of units vesting immediately |  |  |  |  |  |  |  |  |  |  |  | 1,844 | 1,844 |
Number of directors that resigned during period | director |  |  |  |  |  |  |  |  |  | 2 |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee | Granted August 2010 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.1 | $ 0.1 | $ 0.1 |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) |  |  |  |  |  | 175,000 |  |  |  |  |  |  |  |
Number of vesting installments | Installment |  |  |  |  |  | 10 |  |  |  |  |  |  |  |
Number of units vesting annually (in shares) |  |  |  |  |  | 17,500 |  |  |  |  |  |  |  |
Unvested, will accelerate and vest (in shares) |  |  |  |  |  | 35,000 |  |  |  |  |  |  |  |
2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Two Key Employees |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
RSU's granted (in shares) |  |  |  |  |  |  |  | 50,000 |  |  |  |  |  |
Number of vesting installments | Installment |  |  |  |  |  |  |  | 10 |  |  |  |  |  |
Number of units vesting annually (in shares) |  |  |  |  |  |  |  | 5,000 |  |  |  |  |  |
2018 Employee Stock Purchase Plan | Employee Stock |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, shares issued (in shares) | 500,000 |  |  |  |  |  |  |  | 500,000 |  |  |  |  |
Share-based Compensation Arrangement By Share-based Payment Award, Stock Plan Offering Period | 6 months |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, maximum shares available to purchase (in shares) | 10,000 |  |  |  |  |  |  |  |  |  |  |  |  |
Employee stock purchase plan, purchase price of stock, percent | 85.00% |  |  |  |  |  |  |  |  |  |  |  |  |
2018 Employee Stock Purchase Plan | Employee Stock | Selling, General and Administrative Expenses |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Allocated Share-based Compensation Expense | $ |  |  |  |  |  |  |  |  | $ 0.1 |  |  |  |  |
Maximum | 2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Restricted Stock and Restricted Stock Units [Abstract] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of vesting installments | Installment |  |  |  |  |  |  | 3 |  |  |  |  |  |  |
Discontinued Operations | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | 1.5 |  |  |  |  |
Discontinued Operations | 2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | 1.5 | $ 0.1 |  |  |  |
Continuing Operations | Restricted Stock Units (RSUs) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | 0.8 |  |  |  |  |
Continuing Operations | 2010 Long-term Stock Incentive Plan | Restricted Stock Units (RSUs) | Key Employee |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Share based compensation cost | $ |  |  |  |  |  |  |  |  | $ 0.0 |  |  |  |  |

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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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5047-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 14.F) -URI http://asc.fasb.org/extlink&oid=115993241&loc=d3e301413-122809 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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 Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Unrecognized cost of unvested options awarded to employees as compensation. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition The total recognized tax benefit related to compensation cost for equity-based payment arrangements recognized in income during the period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(iii)(1) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(2)(i)-(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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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. + References No definition available. + Details
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- Definition The highest quantity of shares an employee can purchase under the plan per period. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Number of equity instruments other than options outstanding, including both vested and non-vested instruments. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(ii) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c)(1)(i) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition 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). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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- Definition Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (d)(2) -URI http://asc.fasb.org/extlink&oid=109197908&loc=d3e5070-113901 + Details
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