Cash and Cash Equivalents and Short-term Investments (Details 2) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011
Cash and cash equivalents and short-term investments
Cash and cash equivalents, fair value	$ 524,922	$ 398,575
Short-term investments:
Trading equity securities, fair value	52,705	11,600
Trading equity securities, gross unrealized holding gains	46,981	5,876
Available-for-sale equities securities
Available-for-sale equity securities - energy industry	200,577	129,314
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	25,967	57,881
Available-for-sale securities, gross unrealized holding gains	139,205	55,592
Available-for-sale securities, gross unrealized holding losses	(1,225)	(2,348)
Total short-term investments	253,282	140,914
Total cash, cash equivalents and short-term investments, fair value	778,204	539,489
Total cash, cash equivalents and short-term investments, gross unrealized gains	186,186	61,468
Total cash, cash equivalents and short-term investments, gross unrealized losses	(1,225)	(2,348)
Available-for-sale equity securities
Available-for-sale equities securities
Available-for-sale equity securities - energy industry	174,610	71,433
Available-for-sale debt securities:
Available-for-sale securities, gross unrealized holding gains	137,282	33,075
Available-for-sale securities, gross unrealized holding losses	(1,030)
Available-for-sale debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	25,967	57,881
Available-for-sale securities, gross unrealized holding gains	1,923	22,517
Available-for-sale securities, gross unrealized holding losses	(195)	(2,348)
Commercial paper and CDs
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	206	1,230
Corporate debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	23,399	51,300
Available-for-sale securities, gross unrealized holding gains	1,870	22,494
Available-for-sale securities, gross unrealized holding losses		(2,095)
Mortgage-backed debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	244	309
Available-for-sale securities, gross unrealized holding gains	15	10
Mortgage-CMO debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	523	2,547
Available-for-sale securities, gross unrealized holding gains	10	13
Available-for-sale securities, gross unrealized holding losses	(3)	(15)
Asset-backed debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	1,595	2,495
Available-for-sale securities, gross unrealized holding gains	28
Available-for-sale securities, gross unrealized holding losses	(192)	(238)
Short-term Investments
Available-for-sale debt securities:
Total short-term investments	253,282	140,914
Total short-term investments, gross unrealized gains	186,186	61,468
Total short-term investments, gross unrealized holding losses	$ (1,225)	$ (2,348)

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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 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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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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