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Employee Benefit Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013
Significant multiemployer plans |  |  |
Contributions to Plan | $ 52,686 | $ 44,824 | $ 43,887
National Electrical Benefit Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 6,930 | 6,330 | 6,048
National Electrical Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 24,226 | 20,694 | 21,002
Eighth District Electrical Pension Fund [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 5,598 | 5,197 | 5,672
Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 8,070 | 5,114 | 4,300
IBEW Local 1249 Pension Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 2,042 | 2,103 | 3,147
Eighth District Electrical Pension Fund Annuity Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | 3,700 | 3,553 | 2,427
IBEW Local 769 Management Pension Plan [Member] |  |  |
Significant multiemployer plans |  |  |
Contributions to Plan | $ 2,120 | $ 1,833 | $ 1,291

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- Definition Amount of contributions made to multiemployer plans by the employer. 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 11 -URI http://asc.fasb.org/extlink&oid=49170332&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 9 -URI http://asc.fasb.org/extlink&oid=49170332&loc=SL14450691-114947 Reference 3: 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=49170332&loc=SL14450657-114947 + Details
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