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EMPLOYEE RETIREMENT PLANS - Additional Information (Details) | 12 Months Ended
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Dec. 31, 2016 USD ($) participant multiple denominator | Dec. 31, 2015 USD ($) | Dec. 31, 2014 USD ($)
Defined Benefit Plan Disclosure [Line Items] |  |  |
Maximum contribution percentage (in hundredths) | 90.00% |  |
Matching percentage (in hundredths) | 50.00% |  |
Matching contribution limit (in hundredths) | 6.00% |  |
Contributions to the 401(k) Plan | $ 459,000 | $ 348,000 | $ 320,000
Initial prior service cost for retirement plan |  | 5,963,000 |
Prior service cost expected to be amortized in next fiscal year | $ 1,660,000 |  |
Supplemental Executive Retirement Plan [Member] |  |  |
Defined Benefit Plan Disclosure [Line Items] |  |  |
Number of participants | participant | 6 |  |
Factor used to determine annual base salary | multiple | 12 |  |
Annual base salary period (in months) | 24 months |  |
Age of participant (in years) | 65 years |  |
Minimum period of service (in years) | 20 years |  |
Benefit percentage, tier one (in hundredths) | 50.00% |  |
Benefit percentage, tier two (in hundredths) | 25.00% |  |
Benefit percentage, tier three (in hundredths) | 15.00% |  |
Minimum period of service for prorated benefit (in years) | 15 years |  |
Factor used to determine prorated benefit | denominator | 20 |  |
Installment period (in years) | 10 years |  |
Benefit percentage for special participants (in hundredths) | 50.00% |  |
Initial prior service cost for retirement plan | $ 12,700,000 |  |
Prior service cost expected to be amortized in next fiscal year | 1,800,000 |  |
Accumulated benefit obligation | $ 24,700,000 | $ 20,000,000 |
Defined benefit plan threshold of benefit obligation at which actuarial losses are amortized (in hundredths) | 10.00% |  |

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- Definition The threshold age of the employee, at which the participant may be eligible to receive a benefit, if the participant resigns or is terminated without cause at or after this age, and with a defined period of service. + References No definition available. + Details
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- Definition The period (in months) immediately preceding the participant's date of termination of employment, or, if required, the date of a change in control of the Company, used to determine the participant's annual base salary. + References No definition available. + Details
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- Definition The lowest level of percentage of the participant's annual base salary for the life of the participant, on which the benefit is based, depending on the participant's benefit class. + References No definition available. + Details
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- Definition The second level of percentage of the participant's annual base salary for the life of the participant, on which the benefit is based, depending on the participant's benefit class. + References No definition available. + Details
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- Definition The multiple of the highest monthly base salary paid or payable to the participant during the defined period immediately preceding the participant's date of termination or employment, or, if required, the date of a change in control of the Company. This multiple is used to determine the participant's annual base salary. + References No definition available. + Details
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- Definition The threshold percentage of year end benefit obligation for which accumulation of actuarial losses in excess of this threshold are amortized from accumulated other comprehensive loss into net periodic pension cost over future years, based upon the average remaining service period of active plan participants. + References No definition available. + Details
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- Definition For defined benefit pension plans, the actuarial present value of benefits (whether vested or nonvested) attributed by the pension benefit formula to employee service rendered before a specified date and based on employee service and compensation (if applicable) before that date. The accumulated benefit obligation differs from the projected benefit obligation in that it includes no assumption about future compensation levels. For plans with flat-benefit or nonpay-related pension benefit formulas, the accumulated benefit obligation and the projected benefit obligation are the same. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Accumulated Benefit Obligation -URI http://asc.fasb.org/extlink&oid=6503844 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (e) -URI http://asc.fasb.org/extlink&oid=65897934&loc=d3e1928-114920 + 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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