Cash and Cash Equivalents and Short-term Investments (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Cash and cash equivalents and short-term investments
Cash and cash equivalents, fair value	$ 586,001	$ 501,149
Available-for-sale debt securities:
Total short-term investments	35,170us-gaap_ShortTermInvestments	35,020us-gaap_ShortTermInvestments
Total cash, cash equivalents and short-term investments, fair value	621,171	536,169
Total cash, cash equivalents and short-term investments, gross unrealized gains	14,799	14,648
Total cash, cash equivalents and short-term investments, gross unrealized losses	(1)	(1)
Available-for-sale equity securities
Available-for-sale equities securities
Available-for-sale equity securities, fair value	35,152	35,002
Available-for-sale debt securities:
Available-for-sale securities, gross unrealized holding gains	14,799	14,648
Mortgage-CMO debt securities
Available-for-sale debt securities:
Total available-for-sale debt securities, fair value	18	18
Available-for-sale securities, gross unrealized holding losses	(1)	(1)
Total Short-term investments
Available-for-sale debt securities:
Total short-term investments	35,170	35,020
Total short-term investments, gross unrealized gains	14,799	14,648
Total short-term investments, gross unrealized holding losses	$ (1)	$ (1)

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- Definition

Amount of accumulated unrealized gain before deducting unrealized loss on investments in available-for-sale securities impacting investments.

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No definition available.

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Amount of accumulated unrealized loss before deducting unrealized gain on investments in available-for-sale securities impacting investments.

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No definition available.

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- Definition

Represents the information pertaining to cash and cash equivalents and short term investments gross unrealized gains.

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No definition available.

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Represents the information pertaining to cash and cash equivalents and short term investments gross unrealized losses.

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No definition available.

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Represents the information pertaining to short-term investments gross unrealized gains.

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Represents the information pertaining to gross unrealized losses on short-term investments.

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- Definition

Amount of investment in debt and equity securities categorized neither as held-to-maturity nor trading.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 25

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- Definition

Amount of investments in debt securities classified as available-for-sale, expected to be converted to cash, sold or exchanged within one year or the normal operating cycle, if longer.

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- Definition

Fair value portion of currency on hand as well as demand deposits with banks or financial institutions. Includes other kinds of accounts that have the general characteristics of demand deposits. Also includes short-term, highly liquid investments that are both readily convertible to known amounts of cash and so near their maturity that they present insignificant risk of changes in value because of changes in interest rates.

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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.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Cash

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-Name Regulation S-X (SX)

-Number 210

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- Definition

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.

+ References

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-Publisher FASB

-Name Accounting Standards Codification

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-Paragraph 1

-Subparagraph (SX 210.5-02.2)

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-Name Regulation S-X (SX)

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