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Fair Value Measurements (Tables) | 6 Months Ended
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Jun. 30, 2017
Fair Value Disclosures [Abstract] |
Summary of Placement in the Fair Value Hierarchy of Financial Assets that are Measured at Fair Value on a Recurring Basis | The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at June 30, 2017:
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | June 30, 2017
Assets |  |  |  |  |  |  |
U.S. government debt securities | $ | — |  |  | $ | 91,987 |  |  | $ | — |  |  | $ | 91,987 |
Equity securities | 18,042 |  |  | 5,859 |  |  | — |  |  | 23,901 |
Preferred stock | — |  |  | — |  |  | 144,742 |  |  | 144,742 |
Other | — |  |  | 9,129 |  |  | — |  |  | 9,129 |
Total | $ | 18,042 |  |  | $ | 106,975 |  |  | $ | 144,742 |  |  | $ | 269,759 |
The following table presents the placement in the fair value hierarchy of financial assets that are measured at fair value on a recurring basis, including the items for which the fair value option has been elected, at December 31, 2016:
| Quoted Prices in Active Markets (Level 1) |  | Significant Other Observable Inputs (Level 2) |  | Significant Unobservable Inputs (Level 3) |  | December 31, 2016
Assets |  |  |  |  |  |  |
U.S. government debt securities | $ | — |  |  | $ | 180,323 |  |  | $ | — |  |  | $ | 180,323 |
Equity securities | 15,544 |  |  | 7,978 |  |  | — |  |  | 23,522 |
Preferred stock | — |  |  | — |  |  | 129,545 |  |  | 129,545 |
Other | — |  |  | 1,917 |  |  | — |  |  | 1,917 |
Total | $ | 15,544 |  |  | $ | 190,218 |  |  | $ | 129,545 |  |  | $ | 335,307 |
Schedule of Changes in Level 3 Liabilities | The changes in the fair value of the Level 3 liabilities during the six months ended June 30, 2017 were as follows:
| Six Months Ended June 30, 2017
Beginning balance | $ | 2,081 |
Acquisition date fair value of contingent consideration liability (Note 3) | 585 |
Change in fair value of contingent consideration recognized in selling, general and administrative expenses | 160 |
Ending balance | $ | 2,826 |

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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 the fair value measurement of liabilities using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes 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 liability. + References Reference 1: 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=66048111&loc=d3e19279-110258 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258 + Details
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