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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Significant multiemployer plans |  |  |
Contributions to Plan | $ 64,888 | $ 53,796 | $ 52,686
National Electrical Benefit Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 9,542 | 9,040 | 6,930
Eighth District Electrical Management Pension Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 7,908 | 7,519 | 5,598
Indiana,Kentucky,Ohio Regional Council of Carpenters Pension Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 2,515 | 696 | 116
IBEW Local 1249 Pension Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 1,315 | 630 | 2,042
National Electrical Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 27,633 | 22,840 | 24,226
IBEW Local 769 Management Pension Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 2,115 | 1,709 | 2,120
Eighth District Electrical Pension Fund Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 4,109 | 4,883 | 3,700
All other plans [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | $ 9,751 | $ 6,479 | $ 7,954

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- Definition Amount of contributions made to multiemployer plan by employer. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 11 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450702-114947 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 80 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450691-114947 + Details
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