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Commitments and Contingencies - Schedule of Contributions made to Multiemployer Plans (Details) - USD ($) $ in Thousands | 12 Months Ended
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Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 12,442 | $ 11,977 | $ 11,992
Pension Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 3,035 | 3,155 | 3,077
Pension Plans [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 900 | 800 | 700
Health Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 8,551 | 8,280 | 8,296
Health Plans [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 1,600 | 1,600 | 1,400
Other [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | 856 | 542 | 619
Other [Member] | Multiemployer Plan, Individually Insignificant Multiemployer Plans [Member] |  |  |
Multiemployer Plans [Line Items] |  |  |
Contributions | $ 200 | $ 200 | $ 200

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- Definition Amount of contributions made to multiemployer plan by employer. + 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=65877416&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 5 -Subparagraph (e)(1) -URI http://asc.fasb.org/extlink&oid=65877416&loc=SL14450657-114947 Reference 3: 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=65877416&loc=SL14450691-114947 + 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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- Details
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- Details
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