Net Change in Operating Assets and Liabilities (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Decrease (increase) in operating assets:
Accounts receivable	$ 124,983	$ (52,805)	$ (15,200)
Inventory	(46,126)	(64,543)	(6,872)
Prepaid expenses and other assets	33,520	(6,363)	251
Increase (decrease) in operating liabilities:
Accounts payable	(34,972)	16,233	3,797
Income tax payable	(40,263)	(17,832)	0
Interest payable	(40,792)	0	0
Asset retirement obligation	(1,467)	(1,030)	(632)
Accrued expenses	(54,763)	6,151	(1,481)
Net change in operating assets and liabilities	$ (59,880)	$ (120,189)	$ (20,137)

The increase (decrease) during the reporting period in the aggregate amount of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business.

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 230

-SubTopic 10

-Section 45

-Paragraph 28

-Subparagraph (a)

-URI http://asc.fasb.org/extlink&oid=31042434&loc=d3e3602-108585

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The increase (decrease) during the reporting period in amount due within one year (or one business cycle) from customers for the credit sale of goods and services.

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The increase (decrease) during the reporting period in the aggregate amount of expenses incurred but not yet paid.

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The increase (decrease) during the reporting period in the carrying amount of asset retirement obligations.

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The increase (decrease) during the reporting period in the amounts payable to taxing authorities for taxes that are based on the reporting entity's earnings, net of amounts receivable from taxing authorities for refunds of overpayments or recoveries of income taxes.

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No definition available.

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The increase (decrease) during the reporting period in interest payable, which represents the amount owed to note holders, bond holders, and other parties for interest earned on loans or credit extended to the reporting entity.

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The increase (decrease) during the reporting period in the aggregate value of all inventory held by the reporting entity, associated with underlying transactions that are classified as operating activities.

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The increase (decrease) during the reporting period of all assets and liabilities used in operating activities.

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The increase (decrease) during the reporting period in the value of prepaid expenses and other assets not separately disclosed in the statement of cash flows, for example, deferred expenses, intangible assets, or income taxes.

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