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Allowance Accounts (Tables) | 12 Months Ended
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Dec. 31, 2014
Allowance Accounts [Abstract] |
Summary of Valuation Allowance |
|  | Allowance |  | Deferred |
|  | for |  | Tax Asset |
|  | Uncollectible |  | Valuation |
|  | Accounts |  | Allowance |
Balance at December 31, 2011 | $ | 4,000 | $ | 14,310 |
Additions (1) |  | 1,257 |  | 2,081 |
Deductions |  | (105) |  | - |
Balance at December 31, 2012 |  | 5,152 |  | 16,391 |
Additions (2) |  | 2,236 |  | 6,469 |
Deductions (3) |  | (5,154) |  | - |
Balance at December 31, 2013 | $ | 2,234 | $ | 22,860 |
Additions (4) |  | 5,331 |  | 216 |
Deductions (5) |  | (2,830) |  | - |
Balance at December 31, 2014 | $ | 4,735 | $ | 23,076 |
(1) The increase in valuation allowance includes $2.0 million related to our net operating losses generated in Australia and $0.1 million to our oil and gas operations in the United Kingdom. Our Australia deferred tax asset balance has a full valuation allowance against it in all periods presented. (2) The increase in valuation allowance includes $6.5 million related to our net operating losses generated in Australia. (3) The decrease primarily reflects the reversal of a $4 million allowance against our trade receivables for work performed offshore India in 2007 as we collected the previously adjusted receivable balance pursuant to a settlement agreement. (4) The increase in allowance for uncollectible accounts reflects charges associated with the provision for uncertain collection of a portion of our existing trade receivables related to our Robotics segment. (5) The decrease reflects the write-offs of trade receivables deemed uncollectible.

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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 -Topic 740 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32537-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Glossary Valuation Allowance -URI http://asc.fasb.org/extlink&oid=6528051 + Details
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