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Marketable Securities (Future Maturities of Available-for-Sale Securities) (Details) (USD $) In Thousands	Jun. 30, 2011
Available-for-sale securities, amortized cost, maturities less than twelve months	$ 26,048
Available-for-sale securities, fair value, maturities less than twelve months	26,243
Available-for-sale securities, amortized cost, maturities greater than twelve months	0
Available-for-sale securities, fair value, maturities greater than twelve months	0
Common Stock [Member]
Available-for-sale securities, amortized cost, maturities less than twelve months	198
Available-for-sale securities, fair value, maturities less than twelve months	344
Available-for-sale securities, amortized cost, maturities greater than twelve months	0
Available-for-sale securities, fair value, maturities greater than twelve months	0
Government and Agency Securities [Member]
Available-for-sale securities, amortized cost, maturities less than twelve months	25,850
Available-for-sale securities, fair value, maturities less than twelve months	25,899
Available-for-sale securities, amortized cost, maturities greater than twelve months	0
Available-for-sale securities, fair value, maturities greater than twelve months	$ 0

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 neither as held-to-maturity nor trading securities.

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