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Commitments and Contingencies (Details Textual) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Other Commitments [Line Items] |  |  |
Outstanding Performance Bonds | $ 497.0 |  |
Estimated Cost to Complete Bonded Projects | 144.5 |  |
Purchase Commitment, Remaining Minimum Amount Committed | 12.3 |  |
Insurance Claims [Member] |  |  |
Other Commitments [Line Items] |  |  |
Loss Contingency Insurance Expense | 29.5 | $ 25.6 | $ 23.6
Maximum [Member] |  |  |
Other Commitments [Line Items] |  |  |
Loss Contingency Insurance Policy Deductible for Each Line of Coverage Excluding Wildfire and Health | 1.0 |  |
Loss Contingency Insurance Policy Deductible for Wildfire | 2.0 |  |
Loss Contingency Health Insurance Deductible For Qualified Individuals | $ 0.2 |  |

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- Definition Estimated cost to complete bonded projects. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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- Definition Represents the amount of deductible under health insurance benefits for qualified individuals. + References No definition available. + Details
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Balance Type: | debit
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- Definition Represents the insurance expenses, including premiums, for workers' compensation, general liability, automobile liability and employee health benefits. + References No definition available. + Details
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Balance Type: | debit
Period Type: | duration

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- Definition Represents the amount of deductible up to the claim aggregate under insurance arrangements, for each line of coverage, excluding wildfire and health insurance. + References No definition available. + Details
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- Definition Represents the amount of deductible under wildfire insurance for qualified claims. + References No definition available. + Details
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- Definition The total amount of outstanding performance bonds. + References No definition available. + Details
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Balance Type: | debit
Period Type: | instant

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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 Minimum amount to be expended to satisfy the terms of arrangements in which the entity has agreed to expend funds to procure goods or services, excluding long-term purchase commitments or unconditional purchase obligations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(a)(19)) -URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(17)) -URI http://asc.fasb.org/extlink&oid=6876686&loc=d3e534808-122878 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02(25)) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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- Details
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- Details
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