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Employee Benefit Plans (Details 2) (USD $) | 12 Months Ended |  |  |
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Dec. 31, 2013 | Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2013 National Electrical Benefit Fund | Dec. 31, 2012 National Electrical Benefit Fund | Dec. 31, 2011 National Electrical Benefit Fund | Dec. 31, 2013 National Electrical Annuity Plan | Dec. 31, 2012 National Electrical Annuity Plan | Dec. 31, 2011 National Electrical Annuity Plan | Dec. 31, 2013 Eighth District Electrical Pension Fund | Dec. 31, 2012 Eighth District Electrical Pension Fund | Dec. 31, 2011 Eighth District Electrical Pension Fund | Dec. 31, 2013 IBEW Local 1249 Pension Plan | Dec. 31, 2012 IBEW Local 1249 Pension Plan | Dec. 31, 2011 IBEW Local 1249 Pension Plan | Dec. 31, 2013 Eighth District Electrical Pension Fund Annuity Plan | Dec. 31, 2012 Eighth District Electrical Pension Fund Annuity Plan | Dec. 31, 2011 Eighth District Electrical Pension Fund Annuity Plan | Dec. 31, 2013 All other funds: | Dec. 31, 2012 All other funds: | Dec. 31, 2011 All other funds: | Dec. 31, 2013 Multiemployer pension plans Maximum | Dec. 31, 2013 Multiemployer pension plans Minimum item | Mar. 31, 2012 Multiemployer pension plans Minimum Eighth District Electrical Pension Fund | Mar. 31, 2011 Multiemployer pension plans Minimum Eighth District Electrical Pension Fund | Dec. 31, 2012 Multiemployer pension plans Minimum IBEW Local 1249 Pension Plan
Multiemployer pension plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of local unions |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 100 |  |  |
Percentage funded for red zone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 65.00% |  |  |  |
Percentage funded for yellow zone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |  |
Percentage funded for green zone |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Significant multiemployer plans |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Contributions to Plan | $ 43,887,000 | $ 39,763,000 | $ 33,140,000 | $ 6,048,000 | $ 5,731,000 | $ 5,138,000 | $ 21,002,000 | $ 17,081,000 | $ 14,564,000 | $ 5,672,000 | $ 3,733,000 | $ 3,752,000 | $ 3,147,000 | $ 3,679,000 | $ 2,749,000 | $ 2,427,000 | $ 2,560,000 | $ 2,429,000 | $ 5,591,000 | $ 6,979,000 | $ 4,508,000 |  |  |  |  |
Minimum future contributions (as a percent) |  |  |  | 3.00% |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum future contributions (in dollars per hour) |  |  |  |  |  |  |  |  |  | $ 1.71 |  |  | $ 9.60 |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of total contribution to the plan |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00%

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- Definition Amount of minimum contribution(s) as a percent of wages required for future periods to a multiemployer plan by collective bargaining arrangements, statutory obligations, or other contractual obligations. 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 No definition available. + Details
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- Definition Represents the percentage funded for red zone status. + References No definition available. + Details
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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=14450570&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=14450570&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=14450570&loc=SL14450657-114947 + Details
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- Definition Percentage of contributions required by a collective bargaining arrangement to all contributions required of an employer related to 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 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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- Definition Amount of minimum contribution(s) required for future periods to a multiemployer plan by collective bargaining arrangements, statutory obligations, or other contractual obligations. 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 -Subparagraph (f)(3) -URI http://asc.fasb.org/extlink&oid=14450570&loc=SL14450657-114947 + Details
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