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SIGNIFICANT ACCOUNTING POLICIES - Self Insurance (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Class of Stock [Line Items] |  |  |
Self insurance reserve towards deductible for general liability | $ 2.0 |  |
Self insurance reserve towards deductible for workers compensation and employers liability | 1.0 |  |
Self insurance reserve towards deductible for vehicle liability | 2.0 |  |
Self insurance reserve towards deductible for health liability | 0.2 |  |
Excess loss policy limit | 100.0 |  |
Workers' Compensation Liability, Current | 13.9 |  |
Accrued general insurance | 0.5 |  |
Accrued health insurance | $ 1.7 |  |
Employee benefit plans |  |  |
Matching contribution as a percentage of employee contributions | 100.00% |  |
Matching contribution as a percentage of employee compensation | 4.00% |  |
Company 401k contribution |  | $ 4.2 | $ 3.6
First year |  |  |
Employee benefit plans |  |  |
Annual vesting matching contribution as a percentage of employee compensation | 25.00% |  |
Second year |  |  |
Employee benefit plans |  |  |
Annual vesting matching contribution as a percentage of employee compensation | 50.00% |  |
Third year |  |  |
Employee benefit plans |  |  |
Annual vesting matching contribution as a percentage of employee compensation | 75.00% |  |
Fourth year |  |  |
Employee benefit plans |  |  |
Annual vesting matching contribution as a percentage of employee compensation | 100.00% |  |
Minimum |  |  |
Class of Stock [Line Items] |  |  |
Estimated exposure amount of workers compensation claims | $ 12.9 |  |
Maximum |  |  |
Class of Stock [Line Items] |  |  |
Estimated exposure amount of workers compensation claims | $ 14.9 |  |

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- Definition Carrying value as of the balance sheet date of obligations and payables pertaining to claims incurred of a workers compensation nature. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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