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Fair Value Measurements (Narrative) (Details) (USD $)
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12 Months Ended | ||
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Dec. 31, 2011
years
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Dec. 31, 2011
Contingent Consideration [Member]
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Dec. 31, 2010
Contingent Consideration [Member]
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| Short-term Debt [Line Items] | |||
| Weighted-average expected life of underlying student loans minimum, years | 2 | ||
| Weighted-average expected life of underlying student loans maximum, years | 7 | ||
| Annual discount rate used in discounted cash flow model | 2.76% | ||
| Auction rate reset, lower range, in days | 7 | ||
| Auction rate reset, upper range, in days | 14 | ||
| Auction rate securities year of maturity, lower range | 2025 | ||
| Auction rate securities year of maturity, higher range | 2040 | ||
| Auction rate securities annual interest rate, lower range | 0.18% | ||
| Auction rate securities annual interest rate, higher range | 0.80% | ||
| Bonds received from Greek government | $ 63,500,000 | ||
| Balance included in transfers into level 3 | 53,900,000 | ||
| Contingent consideration | $ 135,600,000 | $ 11,100,000 |
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- Definition
Annual Discount Rate Used In Discounted Cash Flow Model No definition available.
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- Definition
The upper limit of range for the annual interest rate of the auction rate securities No definition available.
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- Definition
The lower limit of range for the annual interest rate of the auction rate securities No definition available.
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- Definition
The higher range of the days that Auction rate securities reset No definition available.
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- Definition
The lower range of the days that Auction rate securities reset No definition available.
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- Definition
Auction rate security year of maturity, higher range. No definition available.
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- Definition
Auction rate security year of maturity, lower range. No definition available.
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- Definition
Weighted average expected life of underlying student loans, maximum. No definition available.
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- Definition
Weighted average expected life of underlying student loans, minimum. No definition available.
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- Definition
Fair value, as of the acquisition date, of potential payments under the contingent consideration arrangement including cash and shares. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Definition
Transfers into assets measured at fair value and categorized within Level 3 of the fair value hierarchy that have taken place during the period. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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- Details
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- Definition
Debt securities that are bought and held principally for the purpose of selling them in the near term (thus held for only a short period of time) or for debt securities formerly categorized as available-for-sale or held-to-maturity which the entity held as of the date it opted to account for such securities at fair value. An enterprise may also categorize such a security as trading without the intent to sell it in the near term assuming the decision to categorize the security as trading occurred at acquisition. Reference 1: http://www.xbrl.org/2003/role/presentationRef
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