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Allowance Accounts | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Allowance Accounts | Allowance Accounts The following table sets forth the activity in our valuation accounts for each of the three years in the period ended December 31, 2016 (in thousands):
| Allowance for Uncollectible Accounts |  | Deferred Tax Asset Valuation Allowance
Balance at December 31, 2013 | $ | 2,234 |  |  | $ | 22,860 |
Additions (1) | 5,331 |  |  | — |
Deductions (2) | (2,830 | ) |  | — |
Adjustments | — |  |  | 216 |
Balance at December 31, 2014 | 4,735 |  |  | 23,076 |
Additions (1) | 3,275 |  |  | — |
Deductions (2) | (7,660 | ) |  | — |
Adjustments (3) | — |  |  | (21,140 | )
Balance at December 31, 2015 | 350 |  |  | 1,936 |
Additions (1) | 1,778 |  |  | — |
Deductions (2) | (350 | ) |  | — |
Adjustments (4) | — |  |  | 1,835 |
Balance at December 31, 2016 | $ | 1,778 |  |  | $ | 3,771 |
(1) | The increase in allowance for uncollectible accounts primarily reflects charges associated with the provision for uncertain collection of a portion of our existing trade receivables related to our Robotics segment.
(2) | The decrease in allowance for uncollectible accounts reflects the write-offs of trade receivables that are either settled or deemed uncollectible.
(3) | The decrease in valuation allowance primarily reflects a $20.6 million reduction related to the loss of deferred tax assets for net operating losses within our Australian subsidiaries.
(4) | The increase in valuation allowance primarily reflects additional net operating losses in Brazil for which insufficient future taxable income exists to offset the losses.
Our allowance accounts as of December 31, 2016 also included $4.2 million related to a non-current note receivable (Note 3). See Note 2 for a detailed discussion regarding our accounting policy on accounts and notes receivable and allowance for uncollectible accounts and Note 8 for a detailed discussion of the valuation allowance related to our deferred tax assets.

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- Definition The entire disclosure for any allowance and reserve accounts (their beginning and ending balances, as well as a reconciliation by type of activity during the period). Alternatively, disclosure of the required information may be within the footnotes to the financial statements or a supplemental schedule to the financial statements. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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