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Employee Benefit Plans (Multiemployer Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN | 136123601 |  |  |  |  |
Pension Plan Number | 001 |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |  |
Company Contributions | $ 16.0 | [1] | $ 15.8 | [2] | $ 13.6 | [2]
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Arrangement | Apr. 30, 2019 |  |  |  |  |
Carpenters Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN | 946050970 |  |  |  |  |
FIP/RP Status Pending or Implemented | Implemented |  |  |  |  |
Company Contributions | $ 8.2 | [1] | 4.4 |  | 2.7 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Arrangement | Jun. 30, 2019 |  |  |  |  |
Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN | 946277608 |  |  |  |  |
FIP/RP Status Pending or Implemented | Implemented |  |  |  |  |
Company Contributions | $ 6.6 | [1] | 5.6 |  | 2.8 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Arrangement | Jun. 30, 2019 |  |  |  |  |
Northern California Electrical Workers Pension Plan [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN | 946062674 |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |  |
Company Contributions | $ 5.2 | [1] | 1.5 |  | 0.3 |
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Arrangement | May 31, 2018 |  |  |  |  |
Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN | 136149680 |  |  |  |  |
Pension Plan Number | 001 |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |  |
Company Contributions | $ 3.9 | [1] | $ 3.9 | [2] | $ 6.2 | [2]
Surcharge Imposed | No |  |  |  |  |
Expiration Date of Collective Bargaining Arrangement | Jun. 30, 2020 |  |  |  |  |
Multiemployer Pension Plans [Member] | The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
Exceeded percentage of total contributions | 5.00% |  | 5.00% |  | 5.00% |
Multiemployer Pension Plans [Member] | Carpenters Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Red |  |  |  |  |
Multiemployer Pension Plans [Member] | Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Yellow |  |  |  |  |
Multiemployer Pension Plans [Member] | Northern California Electrical Workers Pension Plan [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
Multiemployer Pension Plans [Member] | Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
Exceeded percentage of total contributions | 5.00% |  | 5.00% |  | 5.00% |
Multiemployer Plans Pension Prior Period [Member] | The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Carpenters Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Red |  |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Yellow |  |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Northern California Electrical Workers Pension Plan [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |  |
[1] | The Company's contributions as a percentage of total plan contributions were not available for any of its plans
[2] | These amounts exceeded 5% of the respective total plan contributions.

X
- Definition The Tax Identification Number (TIN), also known as an Employer Identification Number (EIN), is a unique 9-digit value assigned by the IRS. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation 12B -Number 240 -Section 12b -Subsection 1 + Details
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- Definition The minimum percentage of the reporting entity's contributions to a multiemployer plan as compared to total contributions. + References No definition available. + Details
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- Definition Three digit plan number for 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 (b) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate the multiemployer plan's certified zone status as currently required by the Pension Protection Act of 2006 or a subsequent amendment thereof. The zone status categories are red (critical status), orange (seriously endangered), yellow (endangered), and green (none of the above). The acceptable values are "red", "orange", "yellow", "green", "other", and "NA". 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 (c) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Expiration date of the collective bargaining arrangement requiring contributions to the multiemployer plan, in CCYY-MM-DD format. 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 (d) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Indicate whether a funding improvement plan or rehabilitation plan has been implemented or is pending for 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. The acceptable values are "no", "pending", "implemented", "other", and "NA". + 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)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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- Definition Indicate whether the employer paid a surcharge to the 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. The acceptable values are "no", "yes", and "NA". + 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)(2) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 + Details
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