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Employee Benefit Plans - Multi-Employer Plan (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 USD ($) | Dec. 31, 2016 USD ($) | Dec. 31, 2017 USD ($) plan | Dec. 31, 2016 USD ($) | Jun. 30, 2012 USD ($) quarter | Jan. 05, 2015 USD ($) | Nov. 18, 2014 USD ($)
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Amount | $ 500,000 | $ 300,000 | $ 1,000,000 | $ 800,000 |  |  |
Multiemployer plans, number of plans | plan |  |  | 2 |  |  |  |
Labor Management Pension Fund |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Withdrawal obligation | 4,000,000 |  | $ 4,000,000 |  | $ 4,300,000 | $ 4,900,000 | $ 4,400,000
Multiemployer plan, quarterly installments for withdrawal liability |  |  |  |  | $ 91,000 |  |
Multiemployer plan, quarterly installments for withdrawal liability, number of quarters | quarter |  |  |  |  | 80 |  |
Multiemployer Plans, Pension | Multiemployer Plans, Defined Benefit Pension Plans [Member] |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Multiemployer plans, number of plans | plan |  |  | 2 |  |  |  |
Other Postretirement Benefit Plan |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |
Defined Benefit Plan, Service Cost | 152,000 | 190,000 | $ 304,000 | 380,000 |  |  |
Multiemployer plans, number of plans | plan |  |  | 10 |  |  |  |
Defined Benefit Plan, Interest Cost | 209,000 | 207,000 | $ 418,000 | 414,000 |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | (210,000) | (157,000) | (420,000) | (314,000) |  |  |
Amortization of prior service credit | (439,000) | (439,000) | (878,000) | (878,000) |  |  |
Defined Benefit Plan, Net Periodic Benefit Cost (Credit) | $ (288,000) | $ (199,000) | $ (576,000) | $ (398,000) |  |  |

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- Definition Defined Contribution Plan, Employer Matching Contribution, Amount + References No definition available. + Details
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- Definition Multiemployer Plan, Number of Plans + References No definition available. + Details
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- Definition Multiemployer Plans, Withdrawal Obligation, Monthly Payment Election, Periodic Payment Amount + References No definition available. + Details
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- Definition Multiemployer Plans, Withdrawal Obligation, Monthly Payment Election, Periodic Payment Period + References No definition available. + Details
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- Definition Amount of gain (loss) recognized in net periodic benefit (cost) credit of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(4) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of prior service cost (credit) recognized in net periodic benefit cost (credit) of defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(5) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost recognized for passage of time related to defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(2) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of net periodic benefit cost (credit) for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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- Definition Amount of cost for actuarial present value of benefits attributed to service rendered by employee for defined benefit plan. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (h)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (a)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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