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Employee Benefit Plans (Summary of Key Information for the Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2019 | Dec. 31, 2018 | [1] | Dec. 31, 2017
The Pension, Hospitalization and Benefit Plan of the Electrical Industry - Pension Trust Account [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |
Company Contributions | $ 9.3 | [1] | $ 12.2 | $ 16.0 | [2]
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | Apr. 13, 2022 |  |  |  |
Exceeded percentage of total contributions |  |  |  | 5.00% |
Carpenters Pension Trust Fund for Northern California [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | Implemented |  |  |  |
Company Contributions | $ 4.0 | [1] | 4.9 | $ 8.2 |
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2023 |  |  |  |
Excavators Union Local 731 Pension Fund [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |
Company Contributions | $ 5.1 | [1] | 4.1 | 4.3 |
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | Apr. 30, 2022 |  |  |  |
Northern California Electrical Workers Pension Plan [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |
Company Contributions | $ 3.0 | [1] | 4.1 | 5.2 |
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | May 31, 2022 |  |  |  |
Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |
Company Contributions | $ 3.4 | [1] | 3.8 | 6.6 |
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2023 |  |  |  |
Steamfitters Industry Pension Fund [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
FIP/RP Status Pending or Implemented | NA |  |  |  |
Company Contributions | $ 1.7 | [1] | $ 3.5 | $ 3.9 | [2]
Surcharge Imposed | No |  |  |  |
Expiration Date of Collective Bargaining Agreement | Jun. 30, 2020 |  |  |  |
Exceeded percentage of total contributions |  |  |  | 5.00% |
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 |  |  |  |
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] | Excavators Union Local 731 Pension Fund [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |
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] | Laborers Pension Trust Fund for Northern California [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 |  |  |  |
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] | Excavators Union Local 731 Pension Fund [Member] |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |
Pension Protections Act Zone Status | Green |  |  |  |
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] | Laborers Pension Trust Fund for Northern California [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 the 2019 and 2018 plan years for any of the above pension funds, excluding Excavators Union Local 731 Pension Fund, Northern California Electrical Workers Pension Plan and Steamfitters Industry Pension Fund for the 2018 plan year.
[2] | These amounts exceeded 5% of the respective total plan contributions.

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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://fasb.org/us-gaap/role/ref/legacyRef -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://fasb.org/us-gaap/role/ref/legacyRef -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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