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Accrued Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2017 | Dec. 31, 2016
--- | --- | ---
Other Current Liabilities [Line Items] |  |
Payroll and incentive compensation | $ 9,146 | $ 16,101
Union dues and benefits | 12,494 | 10,261
Profit sharing and thrift plan | 443 | 2,004
Taxes, other than income taxes | 6,807 | 7,639
Other | 6,148 | 6,377
Other current liabilities, total | $ 35,038 | $ 42,382

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- Definition Carrying value as of the balance sheet date of the obligations incurred through that date and payable for employees' services provided, including obligations incurred and payable for incentive compensation awarded to employees. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References No definition available. + Details
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for real and property taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.20) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 720 -SubTopic 30 -Section 45 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=6419918&loc=d3e35281-107843 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section 45 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=82887183&loc=d3e6935-107765 + Details
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