VALUATION AND QUALIFYING ACCOUNTS

12 Months Ended

Dec. 31, 2017

Valuation and Qualifying Accounts [Abstract]

VALUATION AND QUALIFYING ACCOUNTS

SCHEDULE II

ION GEOPHYSICAL CORPORATION AND SUBSIDIARIES

VALUATION AND QUALIFYING ACCOUNTS

Year Ended December 31, 2015	Balance at Beginning of Year		Charged (Credited) to Costs and Expenses			Deductions			Balance at End of Year
	(In thousands)
Allowances for doubtful accounts	$	7,633	$	1,841		$	(4,555	)	$	4,919
Allowances for doubtful notes receivable	4,000		—			—			4,000
Valuation allowance on deferred tax assets	205,264		(11,009		)	—			194,255
Excess and obsolete inventory	29,804		151			(5,480		)	24,475

Year Ended December 31, 2016	Balance at Beginning of Year		Charged (Credited) to Costs and Expenses		Deductions			Balance at End of Year
	(In thousands)
Allowances for doubtful accounts	$	4,919	$	1,834	$	(5,310	)	$	1,443
Allowances for doubtful notes receivable	4,000		—		—			4,000
Valuation allowance on deferred tax assets	194,255		23,334		—			217,589
Excess and obsolete inventory	24,475		429		(9,855		)	15,049

Year Ended December 31, 2017	Balance at Beginning of Year		Charged (Credited) to Costs and Expenses			Deductions			Balance at End of Year
	(In thousands)
Allowances for doubtful accounts	$	1,443	$	949		$	(1,820	)	$	572
Allowances for doubtful notes receivable	4,000		—			—			4,000
Valuation allowance on deferred tax assets	217,589		(64,126		)	—			153,463
Excess and obsolete inventory	15,049		398			(408		)	15,039