Cash and Cash Equivalents and Short-term Investments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Mar. 31, 2013
Cash and cash equivalents and short-term investments
Cash and cash equivalents, fair value	$ 524,922	$ 564,888
Short-term investments:
Trading equity securities, fair value	52,705
Trading equity securities, gross unrealized holding gains	46,981
Available-for-sale equities securities
Available-for-sale equity securities - energy industry	200,577	125,592
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	25,967	28,474
Available-for-sale securities, gross unrealized holding gains	139,205	74,511
Available-for-sale securities, gross unrealized holding losses	(1,225)	(2,366)
Total short-term investments	253,282	125,592
Total cash, cash equivalents and short-term investments, fair value	778,204	690,480
Total cash, cash equivalents and short-term investments, gross unrealized gains	186,186	74,511
Total cash, cash equivalents and short-term investments, gross unrealized losses	(1,225)	(2,366)
Available-for-sale equity securities
Available-for-sale equities securities
Available-for-sale equity securities - energy industry	174,610	97,118
Available-for-sale debt securities:
Available-for-sale securities, gross unrealized holding gains	137,282	69,849
Available-for-sale securities, gross unrealized holding losses	(1,030)	(2,272)
Available-for-sale debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	25,967	28,474
Available-for-sale securities, gross unrealized holding gains	1,923	4,662
Available-for-sale securities, gross unrealized holding losses	(195)	(94)
Commercial paper and CDs
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	206	88
Corporate debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	23,399	26,550
Available-for-sale securities, gross unrealized holding gains	1,870	4,642
Mortgage-backed debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	244	218
Available-for-sale securities, gross unrealized holding gains	15	14
Mortgage-CMO debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	523	253
Available-for-sale securities, gross unrealized holding gains	10	6
Available-for-sale securities, gross unrealized holding losses	(3)	(3)
Asset-backed debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	1,595	1,365
Available-for-sale securities, gross unrealized holding gains	28
Available-for-sale securities, gross unrealized holding losses	(192)	(91)
Short-term Investments
Available-for-sale debt securities:
Total short-term investments	253,282	125,592
Total short-term investments, gross unrealized gains	186,186	74,511
Total short-term investments, gross unrealized holding losses	$ (1,225)	$ (2,366)

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Total of debt securities categorized neither as held-to-maturity nor trading which are intended be sold or mature within one year from the balance sheet date or the normal operating cycle, whichever is longer.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item represents Available-for-sale Securities which consist of all investments in certain debt and equity securities neither classified as trading or held-to-maturity securities. A debt security represents a creditor relationship with an enterprise. Debt securities include, among other items, US Treasury securities, US government securities, municipal securities, corporate bonds, convertible debt, commercial paper, and all securitized debt instruments. An equity security represents an ownership interest in an enterprise or the right to acquire or dispose of an ownership interest in an enterprise at fixed or determinable prices. Equity securities include, among other things, common stock, certain preferred stock, warrant rights, call options, and put options, but do not include convertible debt. An entity may opt to provide the reader with additional narrative text to better understand the nature of investments in debt and equity securities which are categorized as Available-for-sale.

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This element represents the portion of the balance sheet assertion valued at fair value by the entity whether such amount is presented as a separate caption or as a parenthetical disclosure. Additionally, this element may be used in connection with the fair value disclosures required in the footnote disclosures to the financial statements. The element may be used in both the balance sheet and disclosure in the same submission. This item includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the Company may deposit additional funds at any time and also effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months.

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Cash includes currency on hand as well as demand deposits with banks or financial institutions. It also includes other kinds of accounts that have the general characteristics of demand deposits in that the customer may deposit additional funds at any time and effectively may withdraw funds at any time without prior notice or penalty. Cash equivalents, excluding items classified as marketable securities, include short-term, highly liquid Investments that are both readily convertible to known amounts of cash, and so near their maturity that they present minimal risk of changes in value because of changes in interest rates. Generally, only investments with original maturities of three months or less qualify under that definition. Original maturity means original maturity to the entity holding the investment. For example, both a three-month US Treasury bill and a three-year Treasury note purchased three months from maturity qualify as cash equivalents. However, a Treasury note purchased three years ago does not become a cash equivalent when its remaining maturity is three months. Short-term investments, exclusive of cash equivalents, generally consist of marketable securities intended to be sold within one year (or the normal operating cycle if longer) and may include trading securities, available-for-sale securities, or held-to-maturity securities (if maturing within one year), as applicable.

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Investments which are intended to be sold in the short term (usually less than one year or the normal operating cycle, whichever is longer) including trading securities, available-for-sale securities, held-to-maturity securities, and other short-term investments not otherwise listed in the existing taxonomy.

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