Comprehensive Income (Loss) (Details 1) (USD $)	3 Months Ended	6 Months Ended
Jun. 30, 2011	Jun. 30, 2011	Dec. 31, 2010
Accumulated other comprehensive income, net
Unrealized gain on available-for-sale securities, net of tax	$ 31,060,000	$ 31,060,000	$ 5,763,000
Unrealized gain on foreign currency translation, net of tax	15,638,000	15,638,000	4,178,000
Accumulated other comprehensive income, net	46,698,000	46,698,000	9,941,000
Comprehensive Income (Loss) (Textuals) [Abstract]
Tax benefit related to fair value adjustments on available-for-sale securities included in comprehensive income	10,000,000	10,000,000
Tax benefit related to fair value adjustments on available-for-sale securities included in accumulated other comprehensive income	$ 10,000,000	$ 10,000,000

Accumulated appreciation or loss, net of tax, in value of the total of available-for-sale securities at the end of an accounting period.

+ References+ Details

Accumulated adjustment, net of tax, that results from the process of translating subsidiary financial statements and foreign equity investments into the reporting currency from the functional currency of the reporting entity, net of reclassification of realized foreign currency translation gains or losses.

+ References

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Reference 9: http://www.xbrl.org/2003/role/presentationRef
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+ Details

- Definition

Accumulated change in equity from transactions and other events and circumstances from non-owner sources, net of tax effect, at period end. Excludes Net Income (Loss), and accumulated changes in equity from transactions resulting from investments by owners and distributions to owners. Includes foreign currency translation items, certain pension adjustments, unrealized gains and losses on certain investments in debt and equity securities, other than temporary impairment (OTTI) losses related to factors other than credit losses on available-for-sale and held-to-maturity debt securities that an entity does not intend to sell and it is not more likely than not that the entity will be required to sell before recovery of the amortized cost basis, as well as changes in the fair value of derivatives related to the effective portion of a designated cash flow hedge.

+ References

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