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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2016
Fair Value Disclosures [Abstract] |
Fair Values of Financial Assets Measured on Recurring Basis | The fair values of our financial assets that are measured on a recurring basis are as follows (in thousands):
|  | June 30, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate bonds |  | $ | — |  |  | $ | 125,981 |  |  | $ | — |  |  | $ | 125,981 |
Bond and mutual funds |  |  | 25,427 |  |  |  | — |  |  |  | — |  |  |  | 25,427 |
Equity investments |  |  | 237 |  |  |  | — |  |  |  | — |  |  |  | 237 |
Money market funds |  |  | 113,317 |  |  |  | — |  |  |  | — |  |  |  | 113,317 |
Total |  | $ | 138,981 |  |  | $ | 125,981 |  |  | $ | — |  |  | $ | 264,962 |
|  | December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Corporate bonds |  | $ | — |  |  | $ | 126,103 |  |  | $ | — |  |  | $ | 126,103 |
Bond and mutual funds |  |  | 25,052 |  |  |  | — |  |  |  | — |  |  |  | 25,052 |
Equity investments |  |  | 197 |  |  |  | — |  |  |  | — |  |  |  | 197 |
Money market funds |  |  | 77,639 |  |  |  | — |  |  |  | — |  |  |  | 77,639 |
Certificate of deposits |  |  | — |  |  |  | 8,215 |  |  |  | — |  |  |  | 8,215 |
Total |  | $ | 102,888 |  |  | $ | 134,318 |  |  | $ | — |  |  | $ | 237,206 |
Fair Values of Financial Liabilities Carried at Historical Cost | The fair values of our financial liabilities that are carried at historical cost are as follows (in thousands):
|  | June 30, 2016 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Lease financing obligations |  | $ | — |  |  | $ | — |  |  | $ | 97,798 |  |  | $ | 97,798 |
|  | December 31, 2015 |
|  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Total |
Lease financing obligations |  | $ | — |  |  | $ | — |  |  | $ | 97,445 |  |  | $ | 97,445 |

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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 (b) -URI http://asc.fasb.org/extlink&oid=66048111&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=66048111&loc=d3e19190-110258 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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- Definition Tabular disclosure of liabilities measured at fair value measured on a recurring or nonrecurring basis. Includes, but is not limited to, fair value measurements recorded and the reasons for the measurements, level within the fair value hierarchy in which the fair value measurements are categorized and transfers between levels 1 and 2. + 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 (b) -URI http://asc.fasb.org/extlink&oid=66048111&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 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 Reference 3: 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=66048111&loc=d3e19190-110258 + Details
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