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Investments and Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2011
Investments and Fair Value Measurements [Abstract] |
Schedule of Available-for-sale Securities Reconciliation [Table Text Block] | The amortized cost and fair value of available-for-sale investments at December 31, 2011 and December 31, 2010 were as follows:
|  |  |  | Gross |  | Gross |  |
|  | Amortized |  | Unrealized |  | Unrealized |  | Fair
|  | Cost |  | Gains |  | Losses |  | Value
|  | ( in thousands)
December 31, 2011 |  |
Current: |  |  |  |  |  |  |  |
Auction rate student loan educational bonds |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
|  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Auction rate student loan educational bonds |  | $ | 53,650 |  |  | $ | — |  |  | $ | 3,081 |  |  | $ | 50,569 |
|  | $ | 53,650 |  |  | $ | — |  |  | $ | 3,081 |  |  | $ | 50,569 |
|  | $ | 53,650 |  |  | $ | — |  |  | $ | 3,081 |  |  | $ | 50,569 |
December 31, 2010 |  |  |  |  |  |  |  |
Current: |  |  |  |  |  |  |  |
Auction rate student loan educational bonds |  | $ | 8,300 |  |  | $ | — |  |  | $ | — |  |  | 8,300 |
|  | $ | 8,300 |  |  | — |  |  | $ | — |  |  | $ | 8,300 |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |
Auction rate student loan educational bonds |  | $ | 83,475 |  |  | $ | — |  |  | $ | 3,081 |  |  | $ | 80,394 |
|  | $ | 83,475 |  |  | — |  |  | $ | 3,081 |  |  | $ | 80,394 |
|  | $ | 91,775 |  |  | — |  |  | $ | 3,081 |  |  | $ | 88,694 |
Investments Classified by Contractual Maturity Date [Table Text Block] |
|  | Fair Value |  | Amortized Cost
Due within one year |  | $ | — |  |  | $ | — |
Due after one year through five years |  | — |  |  | — |
Due after five years through ten years |  | — |  |  | — |
Due after ten years through May 1, 2040 |  | 50,569 |  |  | 53,650 |
|  | $ | 50,569 |  |  | $ | 53,650 |
Schedule of Inputs Used in Securities Models [Table Text Block] | Inputs used in Company models of all securities held as of December 31, 2011 and December 31, 2010, excluding investments whose fair value is estimated to be par value as of the reporting period due to call notices being received by the Company were as follows:
| December 31, 2011 |  | December 31, 2010 |
Average life of underlying loans | 2-12 years |  | 2-12 years |
Rate of return | 0.68-2.92% |  | 1.28-4.12% |
Discount rate | 0.48-1.14% |  | 0.53-1.85% |
Liquidity discount rate | 0.55-1.16% |  | 0.40-0.80% |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Table Text Block] | The table below presents a rollforward for all assets and liabilities, measured at fair value, on a recurring basis using significant unobservable inputs (Level 3) during the three months ended December 31, 2011 and 2010.
|  | Available-for-sale debt securities
|  | (in thousands)
|  | 2011 |  | 2010
Balance, January 1 |  | $ | 88,694 |  |  | $ | 147,419 |
Settlements |  | (38,125 | ) |  | (61,225 | )
Purchases |  | — |  |  | — |
Issuances |  | — |  |  | — |
Sales |  | — |  |  | — |
Transfers in to (out of) Level 3 |  | — |  |  | — |
Total gains or losses (realized/unrealized): |  |  |  |  |
Included in earnings |  | — |  |  | — |
Included in other comprehensive loss, net of tax |  | — |  |  | 2,500 |
Balance, December 31, |  | $ | 50,569 |  |  | $ | 88,694 |

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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income, and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issuances, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy. Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19279-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6925170&loc=d3e19207-110258 + Details
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