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Marketable Securities (Estimated Fair Values and Gross Unrealized Losses for the Company's Investments in Individual Securities) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012
Investments, Debt and Equity Securities [Abstract]
Estimated Fair Value, Less than 12 Months	$ 76,895
Unrealized Losses, Less than 12 Months	(677)
Estimated Fair Value, More than 12 Months	0
Unrealized Losses, More than 12 Months	$ 0

This item represents the excess of amortized cost basis over fair value of securities that have been in a loss position for less than twelve months for those securities which are categorized neither as held-to-maturity nor trading securities.

+ References+ Details

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for less than twelve months.

+ References+ Details

- Definition

This item represents the aggregate fair value of investments in debt and equity securities categorized neither as held-to-maturity nor trading securities that have been in a continuous unrealized loss position for twelve months or longer.

+ References+ Details