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Employee Benefit Plans (Multiemployer Plans) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014
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 | [2] | $ 15.8 | [1] | $ 13.6 |  | $ 11.8
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | May 31, 2019 |  |  |  |
Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 946277608 |  |  |  |
FIP/RP Status Pending or Implemented |  | Implemented |  |  |  |
Company Contributions | [2] | $ 5.6 | [1] | 2.8 |  | 1.9
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 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 |  | $ 4.4 | [1] | 2.7 |  | 1.9
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 30, 2019 |  |  |  |
Excavators Union Local 731 Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 131809825 |  |  |  |
Pension Plan Number |  | 002 |  |  |  |
FIP/RP Status Pending or Implemented |  | NA |  |  |  |
Company Contributions |  | $ 4.2 | [1],[2] | 7.1 |  | 5.3
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Apr. 30, 2022 |  |  |  |
Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 136149680 |  |  |  |
Pension Plan Number |  | 001 |  |  |  |
FIP/RP Status Pending or Implemented |  | NA |  |  |  |
Company Contributions | [2] | $ 3.9 | [1] | 6.2 |  | 5.1
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 30, 2017 |  |  |  |
Iron Workers Locals 40,361 & 417 Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 516102576 |  |  |  |
Pension Plan Number |  | 001 |  |  |  |
FIP/RP Status Pending or Implemented |  | Implemented |  |  |  |
Company Contributions |  | $ 3.8 | [1] | 5.2 | [2] | 0.7
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 30, 2020 |  |  |  |
Local 147 Construction Workers Retirement Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 136528181 |  |  |  |
FIP/RP Status Pending or Implemented |  | NA |  |  |  |
Company Contributions |  | $ 3.7 | [1] | 5.6 | [2] | 1.3
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 30, 2018 |  |  |  |
Southern California Gunite Workers Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
EIN |  | 954354179 |  |  |  |
FIP/RP Status Pending or Implemented |  | NA |  |  |  |
Company Contributions |  | $ 3.5 | [1] | $ 0.7 |  | $ 0.7
Surcharge Imposed |  | No |  |  |  |
Expiration Date of Collective Bargaining Arrangement |  | Jun. 30, 2019 |  |  |  |
Multiemployer Pension Plans | 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%
Multiemployer Pension Plans | Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Yellow |  |  |  |
Multiemployer Pension Plans | Carpenters Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Red |  |  |  |
Multiemployer Pension Plans | Excavators Union Local 731 Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Multiemployer Pension Plans | Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Exceeded percentage of total contributions |  |  |  | 5.00% |  | 5.00%
Multiemployer Pension Plans | Iron Workers Locals 40,361 & 417 Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Exceeded percentage of total contributions |  |  |  | 5.00% |  |
Multiemployer Pension Plans | Local 147 Construction Workers Retirement Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Exceeded percentage of total contributions |  |  |  | 5.00% |  |
Multiemployer Pension Plans | Southern California Gunite Workers Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | 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] | Laborers Pension Trust Fund for Northern California [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Yellow |  |  |  |
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] | Steamfitters Industry Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Iron Workers Locals 40,361 & 417 Pension Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Yellow |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Local 147 Construction Workers Retirement Fund [Member] |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |
Pension Protections Act Zone Status |  | Green |  |  |  |
Multiemployer Plans Pension Prior Period [Member] | Southern California Gunite Workers 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 our plans
[2] | These amounts exceeded 5% of the respective total plan contributions.

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- 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=49170332&loc=SL14450657-114947 + 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=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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- 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=49170332&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=49170332&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=49170332&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=49170332&loc=SL14450657-114947 + Details
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