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Allowance Accounts
 12 Months Ended
Dec. 31, 2015
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, 2015 (in thousands): 
 
Allowance
for
Uncollectible
Accounts
 
Deferred
Tax Asset
Valuation
Allowance
 
 
 
 
Balance at December 31, 2012
$
5,152

 
$
16,391

Additions (1)
2,236

 
—

Adjustments (2) (3)
(5,154
)
 
6,469

Balance at December 31, 2013
2,234

 
22,860

Additions (1)
5,331

 
—

Deductions (4)
(2,830
)
 
—

Adjustments
—

 
216

Balance at December 31, 2014
4,735

 
23,076

Additions (1)
3,275

 
—

Deductions (4)
(7,660
)
 
—

Adjustments (5)
—

 
(21,140
)
Balance at December 31, 2015
$
350

 
$
1,936

(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 primarily reflects the reversal of a $4.0 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.
(3)
The increase in valuation allowance includes $6.5 million related to our net operating losses generated in Australia.
(4)
The decrease in allowance for uncollectible accounts reflects the write-offs of trade receivables that are either settled or deemed uncollectible.
(5)
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.
 
See Note 2 for a detailed discussion regarding our accounting policy on accounts receivable and allowance for uncollectible accounts and Note 8 for a detailed discussion of the valuation allowance related to our deferred tax assets.