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Cash, Cash Equivalents, and Investments (Tables) | 9 Months Ended
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Sep. 30, 2012
Components of Cash, Cash Equivalents and Investments | Cash, cash equivalents, and investments consisted of the following (in thousands):
|  | September 30, 2012 |  |  | December 31, 2011 |
Cash |  | $ | 43,260 |  |  | $ | 36,404 |
Cash equivalents |  |  | 6,799 |  |  |  | — |
Money market instruments |  |  | 4,099 |  |  |  | 1,699 |
Cash and cash equivalents |  |  | 54,158 |  |  |  | 38,103 |
Corporate bonds |  |  | 45,025 |  |  |  | 55,570 |
Municipal bonds |  |  | 25,257 |  |  |  | 54,036 |
Asset-backed securities |  |  | 12,184 |  |  |  | — |
Treasury bills |  |  | 10,043 |  |  |  | 1,945 |
Covered bonds |  |  | 4,664 |  |  |  | 1,319 |
Agency bonds |  |  | 2,998 |  |  |  | 27,545 |
Sovereign bonds |  |  | 1,699 |  |  |  | 4,016 |
Short-term investments |  |  | 101,870 |  |  |  | 144,431 |
Corporate bonds |  |  | 91,839 |  |  |  | 59,902 |
Municipal bonds |  |  | 58,586 |  |  |  | 69,680 |
Treasury bills |  |  | 35,989 |  |  |  | — |
Asset-backed securities |  |  | 35,018 |  |  |  | — |
Agency bonds |  |  | 24,025 |  |  |  | 12,335 |
Sovereign bonds |  |  | 6,134 |  |  |  | 22,355 |
Covered bonds |  |  | 2,757 |  |  |  | 4,701 |
Limited partnership interest (accounted for using cost method) |  |  | 5,562 |  |  |  | 5,933 |
Long-term investments |  |  | 259,910 |  |  |  | 174,906 |
|  | $ | 415,938 |  |  | $ | 357,440 |
Summary of Available-for-Sale Investments | The following tables summarize the Company’s available-for-sale investments as of September 30, 2012 (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 44,935 |  |  | $ | 94 |  |  | $ | (4 | ) |  | $ | 45,025 |
Municipal bonds |  |  | 25,241 |  |  |  | 17 |  |  |  | (1 | ) |  |  | 25,257 |
Asset-backed securities |  |  | 12,192 |  |  |  | 5 |  |  |  | (13 | ) |  |  | 12,184 |
Treasury bills |  |  | 10,044 |  |  |  | — |  |  |  | (1 | ) |  |  | 10,043 |
Covered bonds |  |  | 4,679 |  |  |  | — |  |  |  | (15 | ) |  |  | 4,664 |
Agency bonds |  |  | 2,999 |  |  |  | — |  |  |  | (1 | ) |  |  | 2,998 |
Sovereign bonds |  |  | 1,699 |  |  |  | — |  |  |  | — |  |  |  | 1,699 |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 91,131 |  |  |  | 723 |  |  |  | (15 | ) |  |  | 91,839 |
Municipal bonds |  |  | 58,246 |  |  |  | 341 |  |  |  | (1 | ) |  |  | 58,586 |
Treasury bills |  |  | 35,993 |  |  |  | 2 |  |  |  | (6 | ) |  |  | 35,989 |
Asset-backed securities |  |  | 34,998 |  |  |  | 48 |  |  |  | (28 | ) |  |  | 35,018 |
Agency bonds |  |  | 24,001 |  |  |  | 43 |  |  |  | (19 | ) |  |  | 24,025 |
Sovereign bonds |  |  | 6,118 |  |  |  | 18 |  |  |  | (2 | ) |  |  | 6,134 |
Covered bonds |  |  | 2,753 |  |  |  | 4 |  |  |  | — |  |  |  | 2,757 |
|  | $ | 355,029 |  |  | $ | 1,295 |  |  | $ | (106 | ) |  | $ | 356,218 |
Gross Unrealized Losses and Fair Value for Available-for-Sale Investments | The following table summarizes the Company’s gross unrealized losses and fair values for available-for-sale investments in an unrealized loss position as of September 30, 2012 (in thousands):
|  | Unrealized Loss Position For |
|  | Less than 12 Months |
|  | Fair Value |  |  | Unrealized Losses |
Treasury bills |  | $ | 38,529 |  |  | $ | (7 | )
Asset-backed securities |  |  | 30,573 |  |  |  | (41 | )
Corporate bonds |  |  | 17,333 |  |  |  | (19 | )
Agency bonds |  |  | 12,558 |  |  |  | (20 | )
Municipal bonds |  |  | 4,828 |  |  |  | (2 | )
Covered bonds |  |  | 4,664 |  |  |  | (15 | )
Sovereign bonds |  |  | 2,464 |  |  |  | (2 | )
|  | $ | 110,949 |  |  | $ | (106 | )
Effective Maturity Dates of Available-for-Sale Investments | The following table presents the effective maturity dates of the Company’s available-for-sale investments as of September 30, 2012 (in thousands):
|  | <1 Year |  |  | 1-2 Years |  |  | 2-3 Years |  |  | 3-4 Years |  |  | 4-5 Years |  |  | 5-7 Years |  |  | Total |
Corporate bonds |  | $ | 45,025 |  |  | $ | 19,494 |  |  | $ | 61,676 |  |  | $ | 8,456 |  |  | $ | 2,213 |  |  | $ | — |  |  | $ | 136,864 |
Municipal bonds |  |  | 25,257 |  |  |  | 31,111 |  |  |  | 10,209 |  |  |  | 7,530 |  |  |  | 4,519 |  |  |  | 5,217 |  |  |  | 83,843 |
Asset-backed securities |  |  | 12,184 |  |  |  | 17,388 |  |  |  | 12,595 |  |  |  | 4,530 |  |  |  | — |  |  |  | 505 |  |  |  | 47,202 |
Treasury bills |  |  | 10,043 |  |  |  | 20,009 |  |  |  | 15,980 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 46,032 |
Covered bonds |  |  | 4,664 |  |  |  | 961 |  |  |  | — |  |  |  | 1,796 |  |  |  | — |  |  |  | — |  |  |  | 7,421 |
Agency bonds |  |  | 2,998 |  |  |  | 8,647 |  |  |  | 7,935 |  |  |  | 5,425 |  |  |  | 1,011 |  |  |  | 1,007 |  |  |  | 27,023 |
Sovereign bonds |  |  | 1,699 |  |  |  | 765 |  |  |  | 3,254 |  |  |  | 2,115 |  |  |  | — |  |  |  | — |  |  |  | 7,833 |
|  | $ | 101,870 |  |  | $ | 98,375 |  |  | $ | 111,649 |  |  | $ | 29,852 |  |  | $ | 7,743 |  |  | $ | 6,729 |  |  | $ | 356,218 |

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