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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($) $ in Thousands | Dec. 31, 2016 | Dec. 31, 2015
--- | --- | ---
Net long-term deferred assets and (liabilities) relating to: |  |
Accounts receivable and inventory reserves | $ 587 | $ 351
Warranty accrual | 3,165 | 3,405
Other accruals | 1,715 | 1,248
Share-based compensation | 1,784 | 1,099
Donations | 463 | 691
Other, net | 738 | 986
Total deferred income tax assets | 8,452 | 7,780
Property & equipment | (17,983) | (16,486)
Total deferred income tax liabilities | (17,983) | (16,486)
Net deferred income tax liabilities | $ 9,531 | $ 8,706

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- Definition Amount of deferred tax liability attributable to taxable temporary differences. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Deferred Tax Liability -URI http://asc.fasb.org/extlink&oid=6510232 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 03 -Paragraph 15 -Subparagraph b(2) -Article 7 + Details
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