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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2019
Employee Benefit Plans |
Individually Significant Multiemployer Pension Plans | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | Expiration Date
​ | ​ | ​ | ​ | Pension Protection Act | ​ | ​ | ​ | Company | ​ | of Collective
​ | ​ | EIN/Pension Plan | ​ | Reported Status(a) | ​ | FIP/RP | ​ | Contributions(d) | ​ | Bargaining
Pension Fund |  | Number |  | 2019 |  | 2018 |  | Status(b)(c) |  | 2019 |  | 2018 |  | 2017 |  | Agreement(s)
Automotive Industries Pension Plan |  | EIN: 94-1133245; Plan Number: 001 |  | Critical and Declining |  | Critical and Declining |  | Implemented | ​ | $ | 1 | ​ | $ | 1 | ​ | $ | 1 |  | 9/30/2021
Suburban Teamsters of Northern Illinois Pension Plan |  | EIN: 36-6155778; Plan Number: 001 |  | Endangered |  | Endangered |  | Implemented | ​ |  | 3 | ​ |  | 3 | ​ |  | 3 |  | Various dates through 3/31/2023
Western Conference of Teamsters Pension Plan |  | EIN: 91-6145047; Plan Number: 001 |  | Not Endangered or Critical |  | Not Endangered or Critical |  | Not Applicable | ​ |  | 32 | ​ |  | 29 | ​ |  | 27 |  | Various dates through 12/31/2024
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 36 | ​ | $ | 33 | ​ | $ | 31 | ​ | ​
Contributions to other Multiemployer Pension Plans | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | 16 | ​ | ​ | 14 | ​ | ​ | 16 | ​ | ​
Total contributions to Multiemployer Pension Plans (e) | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | $ | 52 | ​ | $ | 47 | ​ | $ | 47 | ​ | ​
(a) | The most recent Pension Protection Act zone status available in 2019 and 2018 is for the plan’s year-end as of December 31, 2018 and 2017, respectively. The zone status is based on information that we received from the plan and is certified by the plan’s actuary. As defined in the Pension Protection Act of 2006, among other factors, plans reported as critical are generally less than 65% funded and plans reported as endangered are generally less than 80% funded. Under the Multiemployer Pension Reform Act of 2014, a plan is generally in critical and declining status if it (i) is certified to be in critical status pursuant to the Pension Protection Act of 2006 and (ii) is projected to be insolvent within the next 15 years or, in certain circumstances, 20 years.
As of the date the financial statements were issued, Forms 5500 were not available for the plan years ended in 2019.
(b) | The “FIP/RP Status” column indicates plans for which a Funding Improvement Plan (“FIP”) or a Rehabilitation Plan (“RP”) has been implemented.
(c) | A Multiemployer Pension Plan that has been certified as endangered, seriously endangered or critical may begin to levy a statutory surcharge on contribution rates. Once authorized, the surcharge is at the rate of 5% for the first 12 months and 10% for any periods thereafter. Contributing employers, however, may eliminate the surcharge by entering into a collective bargaining agreement that meets the requirements of the applicable FIP or RP.
(d) | Of the Multiemployer Pension Plans considered to be individually significant, the Company was listed in the Form 5500 of the Suburban Teamsters of Northern Illinois Pension Plan as providing more than 5% of the total contributions for plan years ending December 31, 2018 and 2017.
(e) | Total contributions to Multiemployer Pension Plans excludes contributions related to withdrawal liabilities discussed below.

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- Definition Tabular disclosure of the quantitative and qualitative information related to multiemployer plans in which the employer participates. A multiemployer plan is a pension or postretirement benefit plan to which two or more unrelated employers contribute where assets contributed by one participating employer may be used to provide benefits to employees of other participating employers. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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