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Textuals (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Service Cost | $ 5,242 | $ 4,328 | $ 3,845
Defined contribution plan, employer discretionary contribution amount | 20,600 | 10,000 |
Defined contribution plan, cost recognized | 42,000 | 31,300 | 18,500
Deferred Compensation Liability, Classified, Noncurrent | $ 21,900 | $ 24,300 |
Defined Benefit Plan, Description | The Company sponsors a contributory defined benefit plan (the "Plan") covering substantially all Canadian employees of EECOL. The Plan provides retirement benefits based on earnings and credited service, and participants contribute 2% of their earnings to the Plan. Participants become 100% vested after two years of continuous service or, if earlier, at the participant's normal retirement age. |  |
Defined Benefit Plan, Unfunded Plan | The Company also sponsors a Supplemental Executive Retirement Plan (the "SERP"), which provides additional pension benefits to certain executives of EECOL based on earnings, and credited service. Effective January 1, 2013, the SERP was closed to new participants and existing participants became 100% vested. SERP participants continue to contribute 4% of their earnings to the Plan. |  |
Pension Plan [Member] |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.00% | 3.50% |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 2,900 |  |
Other Nonoperating Gains (Losses) | $ (1,900) | $ (1,800) | $ (1,500)
Supplemental Employee Retirement Plan [Member] |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Assumptions Used Calculating Benefit Obligation, Discount Rate | 4.00% | 3.50% |
Other Postretirement Benefits Plan [Member] |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined Benefit Plan, Estimated Future Employer Contributions in Next Fiscal Year | $ 400 |  |
United States |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined contribution plan, employer matching contribution, percent | 50.00% |  |
Defined contribution plan, maximum annual contribution per employee, percent | 6.00% |  |
Canada | Minimum |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined contribution plan, employer matching contribution, percent | 3.00% |  |
Canada | Maximum |  |  |
Schedule of Employee Benefit Plans [Line Items] |  |  |
Defined contribution plan, employer matching contribution, percent | 5.00% |  |

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