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Employee Benefit Plans - Multi-Employer Plan (Details) | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |  |
--- | --- | --- | --- | --- | --- | ---
Dec. 31, 2018 USD ($) | Dec. 31, 2017 USD ($) | Dec. 31, 2018 USD ($) plan hour | Dec. 31, 2017 USD ($) | Jun. 30, 2012 USD ($) quarter | Jun. 30, 2018 USD ($) | Jan. 05, 2015 USD ($) | Nov. 18, 2014 USD ($)
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Defined Contribution Plan, Employer Matching Contribution, Amount | $ 400,000 | $ 500,000 | $ 900,000 | $ 1,000,000 |  |  |  |
Multiemployer plans, number of plans | plan |  |  | 2 |  |  |  |  |
Defined contribution plan, hours threshold for eligibility | hour |  |  | 1,000 |  |  |  |  |
Defined contribution plan, employer matching contribution percent | 100.00% |  | 50.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, percent of eligible income | 4.00% |  | 6.00% |  |  |  |  |
Defined contribution plan, employer matching contribution, annual vesting percent |  |  | 20.00% |  |  |  |  |
WCTPP [Member] |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Withdrawal obligation | $ 2,600,000 |  | $ 2,600,000 |  |  |  |  |
Labor Management Pension Fund |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Withdrawal obligation |  |  |  |  | $ 4,300,000 | $ 3,800,000 | $ 4,900,000 | $ 4,400,000
Multiemployer plan, quarterly installments for withdrawal liability |  |  |  |  | $ 100,000 |  |  |
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 |  |  |  |  |
Pension Plan |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Defined Benefit Plan, Expected Return (Loss) on Plan Assets | 1,485,000 | 1,456,000 | $ 2,970,000 | 2,912,000 |  |  |  |
Defined Benefit Plan, Service Cost | 0 | 0 | 0 | 0 |  |  |  |
Defined Benefit Plan, Interest Cost | 1,426,000 | 1,432,000 | 2,852,000 | 2,864,000 |  |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | 370,000 | 418,000 | 740,000 | 836,000 |  |  |  |
Net periodic benefit (credit) cost | 11,259,000 | 394,000 | $ 11,570,000 | 788,000 |  |  |  |
Other Postretirement Benefit Plan |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Multiemployer plans, number of plans | plan |  |  | 9 |  |  |  |  |
Defined Benefit Plan, Service Cost | 133,000 | 152,000 | $ 266,000,000 | 304,000,000 |  |  |  |
Defined Benefit Plan, Interest Cost | 222,000 | 209,000 | 444,000,000 | 418,000,000 |  |  |  |
Defined Benefit Plan, Amortization of Gain (Loss) | (209,000) | (210,000) | (418,000,000) | (420,000,000) |  |  |  |
Amortization of prior service credit | (439,000) | (439,000) | (878,000,000) | (878,000,000) |  |  |  |
Net periodic benefit (credit) cost | $ (293,000) | $ (288,000) | (586,000,000) | $ (576,000,000) |  |  |  |
Employee-related | WCTPP [Member] |  |  |  |  |  |  |  |
Multiemployer Plans [Line Items] |  |  |  |  |  |  |  |
Multiemployer plan, quarterly installments for withdrawal liability |  |  | $ 190,507 |  |  |  |  |

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- Definition Defined Contribution Plan, Employer Matching Contribution, Amount + References No definition available. + Details
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- Definition Defined Contribution Plan, Employer Matching Contribution, Percentage of Employee Contribution + 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 expected return (loss) recognized in net periodic benefit (cost) credit, calculated based on expected long-term rate of return and market-related value of plan assets 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)(3) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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