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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 67,023	$ 24,324	$ 205,718	$ 163,953
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	(24,769)	37,541	(132,290)	95,863
Change in Fair Value of Interest Rate Swap Agreements	1,980	0	4,183	0
Total Other Comprehensive Income (Loss)	(22,789)	37,541	(128,107)	95,863
Comprehensive Income (Loss)	44,234	61,865	77,611	259,816
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	(2,104)	(727)	(3,351)	1,486
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 46,338	$ 62,592	$ 80,962	$ 258,330

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