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Marketable Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Marketable Investments [Abstract] |
Summary of the Company 's marketable investments |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Market Value |
December 31, 2012 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal obligations |  | $ | 18,859 |  |  | $ | 27 |  |  | $ | (14 | ) |  | $ | 18,872 |
Federal agency and corporate obligations |  |  | 115,653 |  |  |  | 380 |  |  |  | (29 | ) |  |  | 116,004 |
Total short-term available-for-sale securities |  |  | 134,512 |  |  |  | 407 |  |  |  | (43 | ) |  |  | 134,876 |
ARS, long-term |  |  | 11,000 |  |  |  | — |  |  |  | (2,030 | ) |  |  | 8,970 |
Total available-for-sale securities |  | $ | 145,512 |  |  | $ | 407 |  |  | $ | (2,073 | ) |  | $ | 143,846 |
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Market Value |
December 31, 2011 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Available-for-sale securities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
State and municipal obligations |  | $ | 9,485 |  |  | $ | 9 |  |  | $ | (12 | ) |  | $ | 9,482 |
Federal agency and corporate obligations |  |  | 127,717 |  |  |  | 127 |  |  |  | (335 | ) |  |  | 127,509 |
Total short-term available-for-sale securities |  |  | 137,202 |  |  |  | 136 |  |  |  | (347 | ) |  |  | 136,991 |
ARS, long-term |  |  | 11,000 |  |  |  | — |  |  |  | (1,435 | ) |  |  | 9,565 |
Total available-for-sale securities |  | $ | 148,202 |  |  | $ | 136 |  |  | $ | (1,782 | ) |  | $ | 146,556 |
Summary of available for sale securities at their contractual maturity date |
|  | FY 2013 |  |  | FY2014 |  |  | FY2015 |  |  | Thereafter |  |  | Total |
Federal agency and corporate obligations |  | $ | 50,403 |  |  | $ | 44,727 |  |  | $ | 20,874 |  |  | $ | — |  |  | $ | 116,004 |
State and municipal obligations |  |  | 6,421 |  |  |  | 10,326 |  |  |  | 2,125 |  |  |  | — |  |  |  | 18,872 |
ARS |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 8,970 |  |  |  | 8,970 |
Total short and long-term |  | $ | 56,824 |  |  | $ | 55,053 |  |  | $ | 22,999 |  |  | $ | 8,970 |  |  | $ | 143,846 |
Summary of the gross unrealized losses and market value of available-for-sale securities with unrealized losses |
|  | As of December 31, 2012 |
|  | Less Than 12 Months |  |  | 12 Months or Greater |
|  | Market Value |  |  | Unrealized Losses |  |  | Market Value |  |  | Unrealized Losses |
State and municipal bonds |  | $ | 9,430 |  |  | $ | 14 |  |  | $ | — |  |  | $ | — |
Federal agency and corporate obligations |  |  | 17,716 |  |  |  | 29 |  |  |  | — |  |  |  | — |
ARS |  |  | — |  |  |  | — |  |  |  | 8,970 |  |  |  | 2,030 |
Total |  | $ | 27,146 |  |  | $ | 43 |  |  | $ | 8,970 |  |  | $ | 2,030 |
|  | As of December 31, 2011 |
|  | Less Than 12 Months |  |  | 12 Months or Greater |
|  | Market Value |  |  | Unrealized Losses |  |  | Market Value |  |  | Unrealized Losses |
State and municipal bonds |  | $ | 2,763 |  |  | $ | 9 |  |  | $ | 1,107 |  |  | $ | 3 |
Federal agency and corporate obligations |  |  | 68,962 |  |  |  | 313 |  |  |  | 2,043 |  |  |  | 22 |
ARS |  |  | — |  |  |  | — |  |  |  | 9,565 |  |  |  | 1,435 |
Total |  | $ | 71,725 |  |  | $ | 322 |  |  | $ | 12,715 |  |  | $ | 1,460 |
Summary of Company's fair value hierarchy for its financial assets |
|  | As of December 31, 2012 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market funds (1) |  | $ | 815 |  |  | $ | — |  |  | $ | — |  |  | $ | 815 |
State and municipal obligations |  |  | — |  |  |  | 18,872 |  |  |  | — |  |  |  | 18,872 |
Federal agency and corporate obligations (2) |  |  | — |  |  |  | 148,117 |  |  |  | — |  |  |  | 148,117 |
ARS |  |  | — |  |  |  | — |  |  |  | 8,970 |  |  |  | 8,970 |
Total |  | $ | 815 |  |  | $ | 166,989 |  |  | $ | 8,970 |  |  | $ | 176,774 |
|  | As of December 31, 2011 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Money market funds (1) |  | $ | 5,786 |  |  | $ | — |  |  | $ | — |  |  | $ | 5,786 |
State and municipal obligations |  |  | — |  |  |  | 9,482 |  |  |  | — |  |  |  | 9,482 |
Federal agency and corporate obligations (2) |  |  | — |  |  |  | 128,509 |  |  |  | — |  |  |  | 128,509 |
ARS |  |  | — |  |  |  | — |  |  |  | 9,565 |  |  |  | 9,565 |
Total |  | $ | 5,786 |  |  | $ | 137,991 |  |  | $ | 9,565 |  |  | $ | 153,342 |
Summary of changes in fair value of Level 3 financial assets |
|  | ARS |
Balance at December 31, 2010 |  | $ | 9,117 |
Sales |  |  | — |
Gains included in accumulated other comprehensive income (loss) |  |  | 448 |
Balance at December 31, 2011 |  |  | 9,565 |
Sales |  |  | — |
Losses included in accumulated other comprehensive income (loss) |  |  | (595 | )
Balance at December 31, 2012 |  | $ | 8,970 |

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