Components of Working Capital - Accrued Liabilities Table (Details) - USD ($) $ in Thousands |
Mar. 31, 2016 |
Dec. 31, 2015 |
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Accrued Liabilities [Line Items] | |||||
Accrued interest expense | $ 34,578 | $ 26,194 | |||
Short-term asset retirement obligations | 2,909 | 3,677 | |||
Short-term remediation and reclamation obligations | 1,136 | 1,136 | |||
Income taxes payable | 931 | 770 | |||
Total accrued liabilities | 128,380 | 119,096 | [1] | ||
Accrued Capital Expenditures [Member] | |||||
Accrued Liabilities [Line Items] | |||||
Other accrued liabilities | 68,152 | 61,454 | |||
Accrued Plant Purchases [Member] | |||||
Accrued Liabilities [Line Items] | |||||
Other accrued liabilities | 15,885 | 16,425 | |||
Other Accrued Liabilities [Member] | |||||
Accrued Liabilities [Line Items] | |||||
Other accrued liabilities | $ 4,789 | $ 9,440 | |||
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- Definition Carrying value of the obligation (known or estimated) arising from requirements to perform activities to remediate one or more sites, payable in twelve months or in the next operating cycle if longer. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable, pertaining to costs that are statutory in nature, are incurred on contractual obligations, or accumulate over time and for which invoices have not yet been received or will not be rendered. Examples include taxes, interest, rent and utilities. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Current portion of the carrying amount of a liability for an asset retirement obligation. An asset retirement obligation is a legal obligation associated with the disposal or retirement of a tangible long-lived asset that results from the acquisition, construction or development, or the normal operations of a long-lived asset, except for certain obligations of lessees. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of [accrued] interest payable on all forms of debt, including trade payables, that has been incurred and is unpaid. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of obligations incurred through that date and payable arising from transactions not otherwise specified in the taxonomy. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition Carrying value as of the balance sheet date of obligations incurred and payable for statutory income, sales, use, payroll, excise, real, property and other taxes. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer). Reference 1: http://www.xbrl.org/2003/role/presentationRef
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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. No definition available.
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