Selected Balance Sheet Information (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015
Schedule of Equity Method Investments [Line Items]
Investments and Other Noncurrent Assets	$ 59,130
Accrued Liabilities, Current	430,771	$ 497,679
Deferred income taxes	0	57,337
Equity Method Investments	39,826	49,144
Angola Member
Schedule of Equity Method Investments [Line Items]
Investments and Other Noncurrent Assets	$ 59,130	$ 0

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).

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