Allowance Accounts (Tables)

12 Months Ended

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.