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Fair Value Measurements and Auction Rate Securities (Tables) | 12 Months Ended
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Dec. 31, 2012
Fair Value Measurements and Auction Rate Securities [Abstract] |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following table presents the auction rate securities measured at fair value on a recurring basis using significant unobservable inputs (Level 3) for the periods presented (in thousands):
|  | 2012 |  | 2011
Auction rate securities: |  |  |  |
Beginning balance as of January 1 |  | $ | 1,956 |  |  | $ | 2,001 |
Total gains (realized or unrealized): |  |  |  |  |  |
Recognized gains included in earnings |  | 118 |  |  | 15 |
Settlements |  | (2,074 | ) |  | (60 | )
Ending balance as of December 31 |  | $ | — |  |  | $ | 1,956 |

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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 (loss), 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, issues, 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 Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=7578670&loc=d3e19207-110258 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=7578670&loc=d3e19279-110258 Reference 3: 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Statement of Financial Accounting Standard (FAS) -Number 157 -Paragraph 32 -Subparagraph c -LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009.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. + Details
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