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Employee Retirement Plans (Tables) | 12 Months Ended
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Dec. 31, 2018
Employee Retirement Plans |
Schedule of expense related to participation in retirement plans | The expense related to our participation in the retirement plans was as follows, in thousands:
|  | Years Ended December 31,
|  | 2018 |  | 2017 |  | 2016
Defined contribution plans |  | $ | 7,595 |  | $ | 4,089 |  | $ | 3,950
Multi-employer plans |  |  | 11,224 |  |  | 8,677 |  |  | 6,593
|  | $ | 18,819 |  | $ | 12,766 |  | $ | 10,543
Schedule of contributions to the plan |
|  | Employer |  |  |  |  |  |  |  |  |  |  |  |
|  | Identification |  | PPA Zone Status |  | Funding Plan |  | Contributions (in thousands) |  | Surcharge
Pension Fund |  | Number/Plan Number |  | 2018 |  | 2017 |  | Pending / Implemented |  | 2018 |  | 2017 |  | 2016 |  | Imposed
NCT |  | 94-6050970/001 |  | Red |  | Red |  | Yes |  | $ 3,319 |  | $ 2,319 |  | $ 1,926 |  | No

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- Definition Tabular disclosure of Employer Contributions To Pension Trust Fund. + References No definition available. + Details
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- References No definition available. + Details
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- Definition Tabular disclosure of the costs related to the various types of retirement plans including defined benefit pension plan cost, defined contribution plan cost, other postretirement benefit plan cost, and net periodic benefit cost. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=108410482&loc=d3e1928-114920 + Details
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