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EMPLOYEE BENEFIT PLANS (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
401(k) plans |  |  |
Employer's matching contribution (as a percent) | 70.00% | 70.00% |
Maximum contribution by employer as a percentage of employee's compensation | 5.00% | 5.00% |
Employer's matching contribution before change (as a percent) |  | 60.00% |
Vesting period of employer's contributions | 3 years |  |
Contributions by employer | $ 1.1 | $ 1.1 | $ 0.9
Nonqualified deferred compensation plan |  |  |
Maximum percentage of annual salary and bonus that may be deferred | 100.00% |  |
Period for payment of obligation upon separation, one | 3 years |  |
Period for payment of obligation upon separation, two | 5 years |  |
Deferred compensation plan assets | $ 2.0 | $ 1.4 |

X
- Definition Represents the maximum percentage of salary and bonus that may be deferred by participating employees under the deferred compensation plan. + References No definition available. + Details
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- Definition Represents the period one for the payment of obligation upon separation of employment of the participant under the deferred compensation plan. + References No definition available. + Details
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- Definition Represents the period two for the payment of obligation upon separation of employment of the participant under the deferred compensation plan. + References No definition available. + Details
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- Definition Represents the period after which employer's contribution vest under the defined contribution plan. + References No definition available. + Details
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- Definition Percentage of matching contributions made by employer to a defined contribution plan before change. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Carrying amount as of the balance sheet date of assets held under deferred compensation agreements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.17) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Definition The amount of the cost recognized during the period for defined contribution plans. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 70 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942 + Details
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- Definition Percentage of employees' gross pay for which the employer contributes a matching contribution to a defined contribution plan. + References No definition available. + Details
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- Definition Maximum percentage of employee gross pay the employee may contribute to a defined contribution plan. + References No definition available. + Details
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