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Fair Value Measurement (Tables) | 12 Months Ended
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Dec. 31, 2016
Fair Value Disclosures [Abstract] |
Summary of Investments Measured at Fair Value on Recurring Basis | The following table summarizes the Company’s investments at December 31, 2016 and 2015 measured at fair value on a recurring basis (in thousands):
|  | December 31, 2016 |  |  | December 31, 2015 |
|  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |
|  |  |  |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  |  |  |  |  | Gains |  |  | Recorded |  |  |  |  |  |  | Gains |  |  | Recorded |
|  | Cost |  |  | (Losses) |  |  | Basis |  |  | Cost |  |  | (Losses) |  |  | Basis |
Current: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Cash equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,943 |  |  | $ | — |  |  | $ | 1,943 |  |  | $ | 21,312 |  |  | $ | — |  |  | $ | 21,312 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 4,737 |  |  | $ | — |  |  | $ | 4,737 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Municipal bonds |  |  | 713 |  |  |  | 1 |  |  |  | 714 |  |  |  | — |  |  |  | — |  |  |  | — |
Corporate bonds |  |  | 225 |  |  |  | (1 | ) |  |  | 224 |  |  |  | — |  |  |  | — |  |  |  | — |
Restricted cash and investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 48,557 |  |  | $ | — |  |  | $ | 48,557 |  |  | $ | 76,023 |  |  | $ | — |  |  | $ | 76,023 |
Certificates of deposit |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 10,000 |  |  |  | — |  |  |  | 10,000 |
Total current investments |  | $ | 56,175 |  |  | $ | — |  |  | $ | 56,175 |  |  | $ | 107,335 |  |  | $ | — |  |  | $ | 107,335 |
|  | December 31, 2016 |  |  | December 31, 2015 |
|  |  |  |  |  | Gross |  |  |  |  |  |  |  |  |  |  | Gross |  |  |  |  |
|  |  |  |  |  | Unrealized |  |  |  |  |  |  |  |  |  |  | Unrealized |  |  |  |  |
|  |  |  |  |  | Gains |  |  | Recorded |  |  |  |  |  |  | Gains |  |  | Recorded |
|  | Cost |  |  | (Losses) |  |  | Basis |  |  | Cost |  |  | (Losses) |  |  | Basis |
Long term: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Corporate bonds |  | $ | 567 |  |  | $ | (1 | ) |  | $ | 566 |  |  | $ | 2,970 |  |  | $ | (24 | ) |  | $ | 2,946 |
Municipal bonds |  |  | 76 |  |  |  | — |  |  |  | 76 |  |  |  | 3,135 |  |  |  | (3 | ) |  |  | 3,132 |
Money market funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4 |  |  |  | 0 |  |  |  | 4 |
Restricted cash and investments (1) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 236,036 |  |  | $ | — |  |  | $ | 236,036 |  |  | $ | 175,869 |  |  | $ | — |  |  | $ | 175,869 |
Certificates of deposit |  |  | 6,047 |  |  |  | — |  |  |  | 6,047 |  |  |  | 496 |  |  |  | (1 | ) |  |  | 495 |
Corporate bonds |  |  | 2,886 |  |  |  | 2 |  |  |  | 2,888 |  |  |  | 2,996 |  |  |  | (24 | ) |  |  | 2,972 |
Municipal bonds |  |  | 2,069 |  |  |  | (6 | ) |  |  | 2,063 |  |  |  | 3,613 |  |  |  | (1 | ) |  |  | 3,612 |
U.S. treasuries |  |  | 834 |  |  |  | — |  |  |  | 834 |  |  |  | 4,752 |  |  |  | 1 |  |  |  | 4,753 |
Total long term investments |  |  | 248,515 |  |  |  | (5 | ) |  |  | 248,510 |  |  |  | 193,835 |  |  |  | (52 | ) |  |  | 193,783 |
Total investments |  | $ | 304,690 |  |  | $ | (5 | ) |  | $ | 304,685 |  |  | $ | 301,170 |  |  | $ | (52 | ) |  | $ | 301,118 |
| 1. | Included in restricted cash and investments within the balance sheet as of December 31, 2016 is restricted cash and long term workers' compensation deposits of $4.8 million, which is excluded from the table above.
Summary of Assets Measured at Fair Value on Recurring Basis | The following table summarizes the Company's financial assets measured at fair value on a recurring basis by fair value hierarchy level (in thousands):
|  | December 31, 2016 |  |  | December 31, 2015 |
|  | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Total |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Recorded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | Recorded |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  | Basis |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Other (1) |  |  | Basis |  |  | Level 1 |  |  | Level 2 |  |  | Level 3 |  |  | Other (1) |
Cash Equivalents: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 1,943 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 1,943 |  |  | $ | 21,312 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 21,312 |
Investments: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Certificates of deposit |  | $ | 4,737 |  |  | $ | — |  |  | $ | 4,737 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Municipal bonds |  |  | 790 |  |  |  | — |  |  |  | 790 |  |  |  | — |  |  |  | — |  |  |  | 3,132 |  |  |  | 241 |  |  |  | 2,891 |  |  |  | — |  |  |  | — |
Corporate bonds |  |  | 790 |  |  |  | — |  |  |  | 790 |  |  |  | — |  |  |  | — |  |  |  | 2,946 |  |  |  | 2,291 |  |  |  | 655 |  |  |  | — |  |  |  | — |
Money market funds |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4 |  |  |  | — |  |  |  | — |  |  |  | — |  |  |  | 4 |
Restricted Cash and Investments: (2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Money market funds |  | $ | 284,593 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 284,593 |  |  | $ | 251,892 |  |  | $ | — |  |  | $ | — |  |  | $ | — |  |  | $ | 251,892 |
Certificates of deposit |  |  | 6,047 |  |  |  | — |  |  |  | 6,047 |  |  |  | — |  |  |  | — |  |  |  | 10,495 |  |  |  | — |  |  |  | 10,495 |  |  |  | — |  |  |  | — |
Corporate bonds |  |  | 2,888 |  |  |  | — |  |  |  | 2,888 |  |  |  | — |  |  |  | — |  |  |  | 2,972 |  |  |  | 2,285 |  |  |  | 687 |  |  |  | — |  |  |  | — |
Municipal bonds |  |  | 2,063 |  |  |  | — |  |  |  | 2,063 |  |  |  | — |  |  |  | — |  |  |  | 3,612 |  |  |  | 389 |  |  |  | 3,223 |  |  |  | — |  |  |  | — |
U.S. treasuries |  |  | 834 |  |  |  | — |  |  |  | 834 |  |  |  | — |  |  |  | — |  |  |  | 4,753 |  |  |  | 4,753 |  |  |  | — |  |  |  | — |  |  |  | — |
Total Investments |  | $ | 304,685 |  |  | $ | — |  |  | $ | 18,149 |  |  | $ | — |  |  | $ | 286,536 |  |  | $ | 301,118 |  |  | $ | 9,959 |  |  | $ | 17,951 |  |  | $ | — |  |  | $ | 273,208 |
(1) | In accordance with ASU 2015-07, investments in money market funds measured at fair value using the NAV per share practical expedient are not subject to hierarchy level classification disclosure. The Company invests in money market funds that seek to maintain a stable net asset value. These investments include commingled funds that comprise high-quality short-term securities representing liquid debt and monetary instruments where the redemption value is likely to be the fair value. Redemption is permitted daily without written notice.
(2) | Included in restricted cash and investments within the balance sheet as of December 31, 2016 is restricted cash and long term workers' compensation deposits of $4.8 million, which is excluded from the table above.

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- Definition Tabular disclosure of assets and liabilities, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, 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 1 -URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19190-110258 + Details
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