Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Revenues
Revenues	$ 595,962	$ 486,747	$ 1,789,073	$ 1,467,421
Cost of revenues
Cost of revenues	398,865	320,992	1,235,544	965,752
Gross profit	197,097	165,755	553,529	501,669
Operating expenses
Sales and marketing	47,204	40,529	144,573	126,298
Research and development	47,239	42,455	162,298	126,246
General and administrative	42,352	39,598	188,260	119,883
Amortization of intangible assets	17,960	5,625	53,699	15,144
Restructuring	666	(678)	82,908	7,417
Total operating expenses	155,421	127,529	631,738	394,988
Operating income (loss)	41,676	38,226	(78,209)	106,681
Other income (expense)
Interest income	431	729	1,725	1,468
Interest expense	(14,171)	(3,466)	(44,320)	(10,076)
Other income (expense), net	(2,434)	(1,995)	(2,598)	(7,951)
Total other income (expense)	(16,174)	(4,732)	(45,193)	(16,559)
Income (loss) before income taxes	25,502	33,494	(123,402)	90,122
Income tax benefit (provision)	(5,715)	(6,640)	1,692	(32,247)
Net income (loss)	19,787	26,854	(121,710)	57,875
Net income (loss) attributable to noncontrolling interests	(95)	1,278	1,417	2,357
Net income (loss) attributable to Itron, Inc.	$ 19,882	$ 25,576	$ (123,127)	$ 55,518
Earnings (loss) per common share - Basic (in dollars per share)	$ 0.51	$ 0.66	$ (3.14)	$ 1.44
Earnings (loss) per common share - Diluted (in dollars per share)	$ 0.50	$ 0.65	$ (3.14)	$ 1.41
Weighted average common shares outstanding - Basic (in shares)	39,340	38,713	39,177	38,624
Weighted average common shares outstanding - Diluted (in shares)	39,909	39,467	39,177	39,339
Product [Member]
Revenues
Revenues	$ 525,716	$ 433,984	$ 1,578,740	$ 1,321,062
Cost of revenues
Cost of revenues	357,194	284,762	1,106,586	865,288
Service [Member]
Revenues
Revenues	70,246	52,763	210,333	146,359
Cost of revenues
Cost of revenues	$ 41,671	$ 36,230	$ 128,958	$ 100,464