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Contractual Obligations (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Contractual obligations
Short-term Contractual Obligations: Social obligation payments	$ 49,019	$ 49,019
Long-term Contractual Obligations: Social obligation payments	125,383	168,238
Block 9, offshore Angola
Contractual obligations
Short-term Contractual Obligations: Social obligation payments	150	150
Long-term Contractual Obligations: Social obligation payments	848	848
Block 21, offshore Angola
Contractual obligations
Short-term Contractual Obligations: Social obligation payments	300	300
Long-term Contractual Obligations: Social obligation payments	1,684	1,684
Block 20, offshore Angola
Contractual obligations
Short-term Contractual Obligations: Social obligation payments	48,569	48,569
Long-term Contractual Obligations: Social obligation payments	$ 122,851	$ 165,706

Aggregate carrying amount of current liabilities (due within one year or within the normal operating cycle if longer) not separately disclosed in the balance sheet. Includes 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 and of liabilities not separately disclosed.

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