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Fair Value Measurements (Tables) | 12 Months Ended
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Dec. 31, 2015
Fair Value Measurements |
Schedule of assets measured at fair value on a recurring basis | As of December 31, 2015, the Company held certain assets that are required to be measured at fair value on a recurring basis. Assets measured at fair value on a recurring basis are summarized below (in thousands):
|  | Fair Value Measurements as of December 31, 2015 |
|  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds |  | $ | 286,637 |  | $ | — |  | $ | 286,637 |  | $ | — |
Commercial paper |  |  | 31 |  |  | — |  |  | 31 |  |  | — |
Asset backed securities |  | $ | 286,668 |  | $ | — |  | $ | 286,668 |  | $ | — |
Cash, Cash Equivalents and Restricted Cash |  |  | 211,251 |  |  | 211,251 |  |  | — |  |  | — |
Other Assets(a) |  |  | 2,321 | (a) |  | — |  |  | — |  |  | 2,321 |
Total Assets Measured at Fair Value |  | $ | 500,240 |  | $ | 211,251 |  | $ | 286,668 |  | $ | 2,321 |
|  | Fair Value Measurements as of December 31, 2014 |
|  | Total |  | Level 1 |  | Level 2 |  | Level 3 |
Marketable Securities |  |  |  |  |  |  |  |  |  |  |  |  |
Bonds |  | $ | 410,163 |  | $ | — |  | $ | 410,163 |  | $ | — |
Commercial paper |  |  | 5,110 |  |  | — |  |  | 5,110 |  |  | — |
Asset backed securities |  |  | 415,273 |  |  | — |  |  | 415,273 |  |  | — |
Cash, Cash Equivalents and Restricted Cash |  |  | 143,857 |  |  | 143,857 |  |  | — |  |  | — |
Other Assets(a) |  |  | 2,309 |  |  | — |  |  | — |  |  | 2,309 |
Total Assets Measured at Fair Value |  | $ | 561,439 |  | $ | 143,857 |  | $ | 415,273 |  | $ | 2,309 |
| (a) |  | Auction rate securities included in long-term “Other assets” in the Consolidated Balance Sheet
Schedule of fair value measurements using significant unobservable inputs | The following table presents the Company’s assets measured at fair value on a recurring basis using significant unobservable inputs (Level 3) at December 31, 2015 (in thousands): Fair Value Measurements Using Significant Unobservable Inputs (Level 3)
|  | Auction Rate |
|  | Securities |
Balance at January 1, 2015 |  | $ | 2,309 |
Total realized and unrealized gains or (losses) |  |  |  |
Included in earnings |  |  | — |
Included in other comprehensive income |  |  | 12 |
Transferred out |  |  | — |
Settlements |  |  | — |
Balance at December 31, 2015 |  | $ | 2,321 |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + 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 (a),(b) -URI http://asc.fasb.org/extlink&oid=36462937&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 1 -URI http://asc.fasb.org/extlink&oid=36462937&loc=d3e19190-110258 + Details
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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=36462937&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=36462937&loc=d3e19279-110258 + Details
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