Quarterly report pursuant to Section 13 or 15(d)

Marketable Securities (Continuous Unrealized Loss Position) (Details)

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Marketable Securities (Continuous Unrealized Loss Position) (Details) (USD $)
3 Months Ended 6 Months Ended
Dec. 31, 2011
Dec. 31, 2010
Dec. 31, 2011
Dec. 31, 2010
Investments in an Unrealized Loss Position
Fair Value $ 465,442,000 $ 465,442,000
Gross Unrealized Losses, less than 12 months (1,561,000) [1] (1,561,000) [1]
Gross Unrealized Losses, 12 Months or Longer 0 0
Net realized securities gains (losses) (100,000) 400,000 600,000 1,500,000
Months in Loss Position Not Exceeding this Period 12
Securities Maximum Maturity (years) 3 3
美国国库券
Investments in an Unrealized Loss Position
Fair Value 23,995,000 23,995,000
Gross Unrealized Losses, less than 12 months (3,000) [1] (3,000) [1]
Gross Unrealized Losses, 12 Months or Longer 0 0
美国政府机构证券
Investments in an Unrealized Loss Position
Fair Value 209,146,000 209,146,000
Gross Unrealized Losses, less than 12 months (299,000) [1] (299,000) [1]
Gross Unrealized Losses, 12 Months or Longer 0 0
Municipal securities
Investments in an Unrealized Loss Position
Fair Value 3,626,000 3,626,000
Gross Unrealized Losses, less than 12 months (1,000) [1] (1,000) [1]
Gross Unrealized Losses, 12 Months or Longer 0 0
公司债务证券
Investments in an Unrealized Loss Position
Fair Value 214,565,000 214,565,000
Gross Unrealized Losses, less than 12 months (1,199,000) [1] (1,199,000) [1]
Gross Unrealized Losses, 12 Months or Longer 0 0
Sovereign securities
Investments in an Unrealized Loss Position
Fair Value 14,110,000 14,110,000
Gross Unrealized Losses, less than 12 months (59,000) [1] (59,000) [1]
Gross Unrealized Losses, 12 Months or Longer $ 0 $ 0
[1] 在总未实现的总损失中，截至2011年12月31日，没有任何数量的持续损失位置持续了12个月或更长时间。
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