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Allowance Accounts (Tables) | 12 Months Ended
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Dec. 31, 2016
Valuation and Qualifying Accounts [Abstract] |
Summary of activity in valuation 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.

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- Definition Tabular disclosure of valuation allowances to reduce deferred tax assets to net realizable value, including identification of the deferred tax asset more likely than not will not be fully realized and the corresponding amount of the valuation allowance. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=65882285&loc=d3e32537-109319 + Details
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