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Employee Benefit Plans (Tables)

12 Months Ended

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.

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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

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