Marketable Securities - Maturities of Held to Maturity Investments (Details) (USD $) In Thousands	Jun. 30, 2011
Marketable Securities [Abstract]
Held-to-maturity investments, maturities due within one year	$ 78,255
Held-to-maturity investments, maturities due in one to five years	49,580
Held-to-maturity investments, total maturities due	$ 127,835

This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature after one year and through five years from the balance sheet date and which are categorized as held-to-maturity.

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This item represents debt securities, at cost, net of adjustments including accretion, amortization, collection of cash, previous other-than-temporary impairments recognized in earnings (less any cumulative-effect adjustments, as defined), and fair value hedge accounting adjustments, if any, which are expected to mature within one year of the balance sheet date and which are categorized as held-to-maturity.

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