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Cash, Cash Equivalents, and Investments (Tables) | 12 Months Ended
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Dec. 31, 2012
Components of Cash, Cash Equivalents and Investments | Cash, cash equivalents, and investments consisted of the following (in thousands):
|  | December 31, |
|  | 2012 |  |  | 2011 |
Cash |  | $ | 34,986 |  |  | $ | 36,404 |
Cash equivalents |  |  | 5,098 |  |  |  | — |
Money market instruments |  |  | 5,076 |  |  |  | 1,699 |
Cash and cash equivalents |  |  | 45,160 |  |  |  | 38,103 |
Corporate bonds |  |  | 46,001 |  |  |  | 55,570 |
Asset-backed securities |  |  | 17,666 |  |  |  | — |
Municipal bonds |  |  | 16,224 |  |  |  | 54,036 |
Agency bonds |  |  | 7,482 |  |  |  | 27,545 |
Treasury bills |  |  | 5,997 |  |  |  | 1,945 |
Covered bonds |  |  | 5,618 |  |  |  | 1,319 |
Sovereign bonds |  |  | 3,986 |  |  |  | 4,016 |
Corporate stock |  |  | 2,131 |  |  |  | — |
Short-term investments |  |  | 105,105 |  |  |  | 144,431 |
Corporate bonds |  |  | 100,072 |  |  |  | 59,902 |
Treasury bills |  |  | 36,276 |  |  |  | — |
Asset-backed securities |  |  | 34,710 |  |  |  | — |
Agency bonds |  |  | 29,441 |  |  |  | 12,335 |
Municipal bonds |  |  | 17,846 |  |  |  | 69,680 |
Sovereign bonds |  |  | 10,606 |  |  |  | 22,355 |
Covered bonds |  |  | 5,564 |  |  |  | 4,701 |
Limited partnership interest (accounted for using cost method) |  |  | 3,740 |  |  |  | 5,933 |
Long-term investments |  |  | 238,255 |  |  |  | 174,906 |
|  | $ | 388,520 |  |  | $ | 357,440 |
Summary of Available-for-Sale Investments | The following tables summarize the Company’s available-for-sale investments as of December 31, 2012 (in thousands):
|  | Amortized Cost |  |  | Gross Unrealized Gains |  |  | Gross Unrealized Losses |  |  | Fair Value |
Short-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 45,965 |  |  | $ | 68 |  |  | $ | (32 | ) |  | $ | 46,001 |
Asset-backed securities |  |  | 17,668 |  |  |  | 16 |  |  |  | (18 | ) |  |  | 17,666 |
Municipal bonds |  |  | 16,198 |  |  |  | 26 |  |  |  | — |  |  |  | 16,224 |
Agency bonds |  |  | 7,489 |  |  |  | — |  |  |  | (7 | ) |  |  | 7,482 |
Treasury bills |  |  | 5,996 |  |  |  | 1 |  |  |  | — |  |  |  | 5,997 |
Covered bonds |  |  | 5,637 |  |  |  | 2 |  |  |  | (21 | ) |  |  | 5,618 |
Sovereign bonds |  |  | 4,000 |  |  |  | — |  |  |  | (14 | ) |  |  | 3,986 |
Long-term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  |  | 99,464 |  |  |  | 647 |  |  |  | (39 | ) |  |  | 100,072 |
Treasury bills |  |  | 36,277 |  |  |  | 8 |  |  |  | (9 | ) |  |  | 36,276 |
Asset-backed securities |  |  | 34,831 |  |  |  | 32 |  |  |  | (153 | ) |  |  | 34,710 |
Agency bonds |  |  | 29,411 |  |  |  | 54 |  |  |  | (24 | ) |  |  | 29,441 |
Municipal bonds |  |  | 17,726 |  |  |  | 121 |  |  |  | (1 | ) |  |  | 17,846 |
Sovereign bonds Assets-backed securities |  |  | 10,589 |  |  |  | 20 |  |  |  | (3 | ) |  |  | 10,606 |
Covered bonds |  |  | 5,555 |  |  |  | 9 |  |  |  | — |  |  |  | 5,564 |
|  | $ | 336,806 |  |  | $ | 1,004 |  |  | $ | (321 | ) |  | $ | 337,489 |
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 December 31, 2012 (in thousands):
|  | Unrealized Loss Position For Less than 12 Months . |
|  | Fair Value |  |  | Unrealized Losses |
Corporate bonds |  | $ | 41,958 |  |  | $ | (71 | )
Asset-backed securities |  |  | 33,513 |  |  |  | (171 | )
Agency bonds |  |  | 20,270 |  |  |  | (31 | )
Treasury bills |  |  | 15,977 |  |  |  | (9 | )
Sovereign bonds |  |  | 6,322 |  |  |  | (17 | )
Covered bonds |  |  | 4,358 |  |  |  | (21 | )
Municipal bonds |  |  | 1,484 |  |  |  | (1 | )
|  | $ | 123,882 |  |  | $ | (321 | )
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 December 31, 2012 (in thousands):
|  | <1 Year |  |  | 1-2 Years |  |  | 2-3 Years |  |  | 3-4 Years |  |  | 4-5 Years |  |  | 5-8 Years |  |  | Total |
Corporate bonds |  | $ | 46,001 |  |  | $ | 14,188 |  |  | $ | 71,828 |  |  | $ | 10,180 |  |  | $ | 3,109 |  |  | $ | 767 |  |  | $ | 146,073 |
Asset-backed securities |  |  | 17,666 |  |  |  | 26,727 |  |  |  | 7,983 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 52,376 |
Treasury bills |  |  | 5,997 |  |  |  | 17,307 |  |  |  | 18,969 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 42,273 |
Agency bonds |  |  | 7,482 |  |  |  | 17,156 |  |  |  | 8,196 |  |  |  | 3,147 |  |  |  | 942 |  |  |  | — |  |  |  | 36,923 |
Municipal bonds |  |  | 16,224 |  |  |  | 12,902 |  |  |  | 2,442 |  |  |  | 1,084 |  |  |  | 1,418 |  |  |  | — |  |  |  | 34,070 |
Sovereign bonds |  |  | 3,986 |  |  |  | 757 |  |  |  | 3,240 |  |  |  | 6,609 |  |  |  | — |  |  |  |  |  |  |  | 14,592 |
Covered bonds |  |  | 5,618 |  |  |  | 1,424 |  |  |  | 2,346 |  |  |  | 1,794 |  |  |  | — |  |  |  | — |  |  |  | 11,182 |
|  | $ | 102,974 |  |  | $ | 90,461 |  |  | $ | 115,004 |  |  | $ | 22,814 |  |  | $ | 5,469 |  |  | $ | 767 |  |  | $ | 337,489 |

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- Definition For all investments in an unrealized loss position, including those for which other-than-temporary impairments have not been recognized in earnings (including investments for which a portion of an other-than-temporary impairment has been recognized in other comprehensive income), a tabular disclosure of the aggregate related fair value of investments with unrealized losses and the aggregate amount of unrealized losses (that is, the amount by which amortized cost basis exceeds fair value). + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 320 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=6872113&loc=d3e27290-111563 + Details
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