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Other Long-Term Liabilities- New Jersey tax benefits (Details) - USD ($) $ in Thousands | 1 Months Ended | 12 Months Ended
--- | --- | ---
Nov. 30, 2015 | Dec. 31, 2014 | Jan. 31, 2014 | Jan. 31, 2013 | Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Investment and other income |  |  |  |  | $ 4,214 | $ 4,386 | $ 2,344
New Jersey tax benefits |  |  |  |  |  |  |
Amount of tax benefit | $ 9,800 | $ 1,900 | $ 1,100 | $ 800 |  |  |
Proceeds from sale of tax credits | $ 9,200 | $ 1,800 | $ 1,000 | $ 800 |  |  |
Base of operations requirement (in years) |  |  |  |  | 5 years |  |
Investment and other income |  |  |  |  | $ 2,700 | $ 2,800 | $ 1,000

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- Definition Amount of current state and local tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Current Tax Expense (or Benefit) -URI http://asc.fasb.org/extlink&oid=6509736 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32639-109319 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SAB Topic 6.I.7) -URI http://asc.fasb.org/extlink&oid=34349781&loc=d3e330036-122817 + Details
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- Definition The amount of interest income and other income recognized during the period. Included in this element is interest derived from investments in debt securities, cash and cash equivalents, and other investments which reflect the time value of money or transactions in which the payments are for the use or forbearance of money and other income from ancillary business-related activities (that is, excluding major activities considered part of the normal operations of the business). + References No definition available. + Details
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