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Employee Benefit Plans (Tables) | 12 Months Ended
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Dec. 31, 2017
Compensation and Retirement Disclosure [Abstract] |
Schedule of Multiemployer Plans [Table Text Block] | Information in the table has been presented separately for individually significant plans and in the aggregate for all other plans.
Pension Fund |  | EIN/Pension Plan Number |  | Pension Protection Act Zone Status |  | Contributions to Plan for the Year Ended December 31, |  | Funding Plan |  | Surcharge Imposed
|  |  |  | Status |  | Plan Year End |  | Status |  | Plan Year End |  | 2017 |  | 2016 |  | 2015
|  |  |  |  |  |  |  |  |  |  |  | (in thousands) |  |  |  |
Defined Benefit Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Electrical Benefit Fund |  |  | 53-0181657 001 |  |  |  | Green |  |  |  | 12/31/2016 |  |  |  | Green |  |  |  | 12/31/2015 |  |  | $ | 9,542 |  |  | $ | 9,040 |  |  | $ | 6,930 |  |  |  | No |  |  |  | No |
Eighth District Electrical Management Pension Fund |  |  | 84-6100393 001 |  |  |  | Green |  |  |  | 3/31/2017 |  |  |  | Green |  |  |  | 3/31/2016 |  |  |  | 7,908 |  |  |  | 7,519 |  |  |  | 5,598 |  |  |  | No |  |  |  | No |
Indiana/Kentucky/Ohio Regional Council of Carpenters Pension Fund |  |  | 51-6123713 001 |  |  |  | Green |  |  |  | 6/30/2016 |  |  |  | Green |  |  |  | 6/30/2015 |  |  |  | 2,515 |  |  |  | 696 |  |  |  | 116 |  |  |  | No |  |  |  | No |
IBEW Local 769 Management Pension Plan |  |  | 86-6049763 001 |  |  |  | Green |  |  |  | 6/30/2016 |  |  |  | Green |  |  |  | 6/30/2015 |  |  |  | 2,115 |  |  |  | 1,709 |  |  |  | 2,120 |  |  |  | No |  |  |  | No |
IBEW Local 1249 Pension Plan |  |  | 15-6035161 001 |  |  |  | Yellow |  |  |  | 12/31/2016 |  |  |  | Yellow |  |  |  | 12/31/2015 |  |  |  | 1,315 |  |  |  | 630 |  |  |  | 2,042 |  |  |  | Yes |  |  |  | No |
Defined Contribution Plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
National Electrical Annuity Plan |  |  | 52-6132372 001 |  |  |  |  |  |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  | 27,633 |  |  |  | 22,840 |  |  |  | 24,226 |  |  |  | n/a |  |  |  | n/a |
Eighth District Electrical Pension Fund Annuity Plan |  |  | 84-6100393 002 |  |  |  |  |  |  |  | n/a |  |  |  |  |  |  |  | n/a |  |  |  | 4,109 |  |  |  | 4,883 |  |  |  | 3,700 |  |  |  | n/a |  |  |  | n/a |
All other plans: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 9,751 |  |  |  | 6,479 |  |  |  | 7,954 |  |  |  |  |  |  |  |  |
Total Contributions: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ | 64,888 |  |  | $ | 53,796 |  |  | $ | 52,686 |  |  |  |  |  |  |  |  |

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- References No definition available. + Details
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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://www.xbrl.org/2003/role/presentationRef -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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