Iron Mountain (IRM) 10-Q 26 Apr 18 2018 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2018	Apr. 20, 2018
Document and Entity Information
Entity Registrant Name	IRON MOUNTAIN INC
Entity Central Index Key	1,020,569
Document Type	10-Q
Document Period End Date	Mar. 31, 2018
Amendment Flag	false
Current Fiscal Year End Date	--12-31
Entity Current Reporting Status	Yes
Entity Filer Category	Large Accelerated Filer
Entity Common Stock, Shares Outstanding		285,923,945
Document Fiscal Year Focus	2,018
Document Fiscal Period Focus	Q1

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and cash equivalents	$ 442,491	$ 925,699
Accounts receivable (less allowances of $46,648 and $49,512 as of December 31, 2017 and March 31, 2018, respectively)	859,106	835,742
Prepaid expenses and other	223,276	188,874
Total Current Assets	1,524,873	1,950,315
Property, Plant and Equipment:
Property, plant and equipment	7,306,059	6,251,100
Less—Accumulated depreciation	(2,940,588)	(2,833,421)
Property, Plant and Equipment, Net	4,365,471	3,417,679
Other Assets, Net:
Goodwill	4,325,478	4,070,267
Customer relationships, customer inducements and data center lease-based intangibles	1,592,488	1,400,547
Other	189,839	133,594
Total Other Assets, Net	6,107,805	5,604,408
Total Assets	11,998,149	10,972,402
Current Liabilities:
Current portion of long-term debt	137,198	146,300
Accounts payable	251,214	289,137
Accrued expenses	574,725	653,146
Deferred revenue	267,925	241,590
Total Current Liabilities	1,231,062	1,330,173
Long-term Debt, net of current portion	8,020,873	6,896,971
Other Long-term Liabilities	96,731	73,039
Deferred Rent	125,442	126,231
Deferred Income Taxes	169,889	155,728
Commitments and Contingencies (see Note 8)
Redeemable Noncontrolling Interest	92,877	91,418
Iron Mountain Incorporated Stockholders' Equity:
Preferred stock (par value $0.01; authorized 10,000,000 shares; none issued and outstanding)	0	0
Common stock (par value $0.01; authorized 400,000,000 shares; issued and outstanding 283,110,183 shares and 285,923,405 shares as of December 31, 2017 and March 31, 2018, respectively)	2,859	2,831
Additional paid-in capital	4,250,757	4,164,562
(Distributions in excess of earnings) Earnings in excess of distributions	(1,919,787)	(1,765,966)
Accumulated other comprehensive items, net	(74,082)	(103,989)
Total Iron Mountain Incorporated Stockholders' Equity	2,259,747	2,297,438
Noncontrolling Interests	1,528	1,404
Total Equity	2,261,275	2,298,842
Total Liabilities and Equity	$ 11,998,149	$ 10,972,402

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Statement of Financial Position [Abstract]
Accounts receivable, allowances (in dollars)	$ 49,512	$ 46,648
Preferred stock, par value (in dollars per share)	$ 0.01	$ 0.01
Preferred stock, authorized shares	10,000,000	10,000,000
Preferred stock, issued shares	0	0
Preferred stock, outstanding shares	0	0
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common stock, authorized shares	400,000,000	400,000,000
Common stock, issued shares	285,923,405	283,110,183
Common stock, outstanding shares	285,923,405	283,110,183

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	Feb. 14, 2018	Oct. 24, 2017	Jul. 27, 2017	May 24, 2017	Feb. 15, 2017	Mar. 31, 2018	Mar. 31, 2017
Revenues:
Storage rental						$ 651,149	$ 572,279
Service						391,309	366,597
Total Revenues						1,042,458	938,876
Operating Expenses:
Cost of sales (excluding depreciation and amortization)						448,721	426,707
Selling, general and administrative						269,730	240,166
Depreciation and amortization						160,578	124,707
(Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net						(1,130)	(459)
Total Operating Expenses						877,899	791,121
Operating Income (Loss)						164,559	147,755
Interest Expense (Income), Net						97,626	86,055
Other (Income) Expense, Net						20,151	(6,364)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes						46,782	68,064
Provision (Benefit) for Income Taxes						1,168	9,220
Income (Loss) from Continuing Operations						45,614	58,844
Income (loss) from discontinued operations, net of tax						(462)	(337)
Net income (loss)						45,152	58,507
Less: Net Income (Loss) Attributable to Noncontrolling Interests						468	382
Net Income (Loss) Attributable to Iron Mountain Incorporated						$ 44,684	$ 58,125
Earnings (Losses) per Share—Basic:
Income (Loss) from Continuing Operations						$ 0.16	$ 0.22
Total Income (Loss) from Discontinued Operations, Net of Tax, per Basic Share						0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated						0.16	0.22
Earnings (Losses) per Share-Diluted:
Income (Loss) from Continuing Operations						0.16	0.22
Income (Loss) from Discontinued Operations, Net of Tax, Per Diluted Share						0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated						$ 0.16	$ 0.22
Weighted Average Common Shares Outstanding-Basic (in shares)						285,259,000	263,855,000
Weighted Average Common Shares Outstanding-Diluted (in shares)						285,992,878	264,809,666
Dividends Declared per Common Share (in dollars per share)	$ 0.5875	$ 0.5875	$ 0.55	$ 0.55	$ 0.55	$ 0.5888	$ 0.5504

CONSOLIDATED STATEMENTS OF OPE5

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement [Abstract]
Interest Income	$ 1,386	$ 2,293

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 45,152	$ 58,507
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	31,651	50,784
Change in Fair Value of Interest Rate Swap Agreements	(185)	0
Total Other Comprehensive Income (Loss)	31,466	50,784
Comprehensive Income (Loss)	76,618	109,291
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	2,027	(168)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 74,591	$ 109,459

CONSOLIDATED STATEMENTS OF EQUI

CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Thousands	Total	Common Stock	Additional Paid-in Capital	Earnings in Excess of Distributions (Distributions in Excess of Earnings)	Accumulated Other Comprehensive Items, Net	Noncontrolling Interests	Redeemable Noncontrolling Interests	Equity Offering [Member]	Equity Offering [Member]Common Stock	Equity Offering [Member]Additional Paid-in Capital	At The Market (ATM) Equity Program [Member]	At The Market (ATM) Equity Program [Member]Common Stock	At The Market (ATM) Equity Program [Member]Additional Paid-in Capital
Increase (Decrease) in Stockholders' Equity
Redeemable Noncontrolling Interest							$ 54,697
Balance (in shares) at Dec. 31, 2016		263,682,670
Balance at Dec. 31, 2016	$ 1,936,671	$ 2,636	$ 3,489,795	$ (1,343,311)	$ (212,573)	$ 124
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		427,718
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	2,453	$ 5	2,448
Adjustments to Additional Paid in Capital, Change in Value of Redeemable Noncontrolling Interests	(307)						307
Business Combination, Consideration Transferred, Equity Interests Issued and Issuable			(307)
Parent cash dividends declared	(145,427)			(145,427)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Excluding Redeemable Noncontrolling Interest, Net of Tax	51,405				51,334	71
Temporary Equity, Foreign Currency Translation Adjustments							(621)
Change in Fair Value of Interest Rate Swap Agreements	0
Net income (loss)	58,507			58,125		225
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	58,350
Temporary Equity, Net Income							157
Noncontrolling interests equity contributions	0					0
Noncontrolling interest equity contributions, redeemable noncontrolling interests							13,230
Noncontrolling interests dividends	(214)					(214)
Temporary Equity, Accretion of Dividends							(462)
Noncontrolling Interest, Decrease from Redemptions or Purchase of Interests	843					843
Balance at Mar. 31, 2017	1,903,774	$ 2,641	3,491,936	(1,430,613)	(161,239)	1,049
Balance (in shares) at Mar. 31, 2017		264,110,388
Increase (Decrease) in Stockholders' Equity
Redeemable Noncontrolling Interest							67,308
Redeemable Noncontrolling Interest	$ 91,418						91,418
Balance (in shares) at Dec. 31, 2017	283,110,183	283,110,183
Balance at Dec. 31, 2017	$ 2,298,842	$ 2,831	4,164,562	(1,765,966)	(103,989)	1,404
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		364,736
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	1,432	$ 4	1,428
Stock Issued During Period, Value, New Issues								$ 76,192	$ 22	$ 76,170	$ 8,716	$ 2	$ 8,714
Business Acquisition, Equity Interest Issued or Issuable, Number of Shares									2,175,000			273,486
Adjustments to Additional Paid in Capital, Change in Value of Redeemable Noncontrolling Interests	(117)		(117)				117
Parent cash dividends declared	(169,044)			(169,044)
Other Comprehensive Income (Loss), Foreign Currency Transaction and Translation Adjustment, Excluding Redeemable Noncontrolling Interest, Net of Tax	30,246				30,092	154
Temporary Equity, Foreign Currency Translation Adjustments							1,405
Change in Fair Value of Interest Rate Swap Agreements	(185)				(185)
Net income (loss)	45,152
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	44,654			44,684		(30)
Temporary Equity, Net Income							498
Noncontrolling interests dividends	0					0
Temporary Equity, Accretion of Dividends							(561)
Balance at Mar. 31, 2018	$ 2,261,275	$ 2,859	$ 4,250,757	(1,919,787)	$ (74,082)	$ 1,528
Balance (in shares) at Mar. 31, 2018	285,923,405	285,923,405
Increase (Decrease) in Stockholders' Equity
Redeemable Noncontrolling Interest	$ 92,877						$ 92,877
Cumulative Effect of New Accounting Principle in Period of Adoption | Accounting Standards Update 2014-09	$ (29,461)			$ (29,461)

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Net income (loss)	$ 45,152	$ 58,507
Income (loss) from discontinued operations, net of tax	(462)	(337)
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	113,432	99,592
Amortization (includes amortization of deferred financing costs and discount of $3,907 and $3,553 for the three months ended March 31, 2017 and 2018, respectively)	50,699	29,022
Revenue reduction associated with amortization of permanent withdrawal fees	3,664	3,158
Stock-based compensation expense	7,384	6,549
(Benefit) Provision for deferred income taxes	(387)	(7,386)
(Gain) Loss on disposal/write-down of property, plant and equipment, net (including real estate)	(1,130)	(459)
Foreign currency transactions and other, net	23,530	(786)
Changes in Assets and Liabilities (exclusive of acquisitions):
Accounts receivable	(10,590)	(8,971)
Prepaid expenses and other	(56,937)	(24,826)
Accounts payable	(1,381)	5,869
Accrued expenses and deferred revenue	(76,324)	(36,112)
Other assets and long-term liabilities	(6,006)	(2,320)
Cash Flows from Operating Activities - Continuing Operations	91,568	122,174
Cash Flows from Operating Activities - Discontinued Operations	0	(337)
Cash Flows from Operating Activities	91,568	121,837
Cash Flows from Investing Activities:
Capital expenditures	(95,605)	(73,202)
Cash paid for acquisitions, net of cash acquired	(1,428,974)	(12,187)
Acquisition of customer relationships	(12,602)	(17,132)
Customer inducements (see Note 2.c.)	(130)	(4,271)
Contract fulfillment costs (see Note 2.d.)	(5,314)	0
Net proceeds from Divestments (see Note 10)	0	2,423
Proceeds from sales of property and equipment and other, net (including real estate)	(19,387)	66
Cash Flows from Investing Activities—Continuing Operations	(1,562,012)	(104,303)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(1,562,012)	(104,303)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	(4,410,656)	(2,682,348)
Proceeds from revolving credit, term loan and bridge facilities and other debt	5,496,491	2,714,783
Debt financing and equity contribution from noncontrolling interests	0	13,230
Debt repayment and equity distribution to noncontrolling interests	(561)	(2,562)
Parent cash dividends	(169,006)	(2,060)
Net proceeds associated with the Over-Allotment Option (see Note 9)	76,192	0
Proceeds From Issuance Of At The Market Program	8,716	0
Net (payments) proceeds associated with employee stock-based awards	(5,950)	(4,308)
Payment of debt financing and stock issuance costs	(9,974)	(73)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	985,252	36,662
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	985,252	36,662
Effect of Exchange Rates on Cash and Cash Equivalents	1,984	4,948
(Decrease) Increase in cash and cash equivalents	(483,208)	59,144
Cash and cash equivalents, beginning of period	925,699	236,484
Cash and cash equivalents, end of period	442,491	295,628
Non-Cash Investing and Financing Activities:
Capital Leases	13,877	24,395
Accrued Capital Expenditures	36,760	63,655
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks	149	0
Decrease in Fair Value of OSG Investment	87	0
Dividends Payable	172,140	148,992
Cash Paid for Interest	122,027	99,022
Cash Paid for Income Taxes, Net	$ 22,292	$ 30,422

CONSOLIDATED STATEMENTS OF CAS9

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Statement of Cash Flows [Abstract]
Deferred financing costs and discount included in Amortization	$ 3,553	$ 3,907

General

General	3 Months Ended
	Mar. 31, 2018
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	The interim condensed consolidated financial statements are presented herein and, in the opinion of management, reflect all adjustments of a normal recurring nature necessary for a fair presentation. Interim results are not necessarily indicative of results for a full year. Iron Mountain Incorporated, a Delaware corporation ("IMI"), and its subsidiaries ("we" or "us") store records, primarily physical records and data backup media, provide colocation and wholesale data center spaces and provide information management and data center solutions that help organizations in various locations throughout North America, Europe, Latin America, Asia and Africa protect their information, lower storage rental costs, comply with regulations, facilitate corporate disaster recovery, and better use their information and information technology ("IT") infrastructure for business advantages, regardless of its format, location or life cycle stage. We currently serve customers across an array of market verticals - commercial, legal, financial, healthcare, insurance, life sciences, energy, business services, entertainment and government organizations. The unaudited condensed consolidated financial statements have been prepared pursuant to the rules and regulations of the United States Securities and Exchange Commission (the "SEC"). Certain information and footnote disclosures normally included in the annual financial statements prepared in accordance with accounting principles generally accepted in the United States of America ("GAAP") have been omitted pursuant to those rules and regulations, but we believe that the disclosures included herein are adequate to make the information presented not misleading. The Condensed Consolidated Financial Statements and Notes thereto, which are included herein, should be read in conjunction with the Consolidated Financial Statements and Notes thereto for the year ended December 31, 2017 included in our Annual Report on Form 10-K filed with the SEC on February 16, 2018 (our "Annual Report"). We have been organized and have operated as a real estate investment trust for United States federal income tax purposes ("REIT") beginning with our taxable year ended December 31, 2014. On January 1, 2018, we adopted Accounting Standards Update ("ASU") No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"). See Note 2.d. On January 10, 2018, we completed the acquisition of IO Data Centers, LLC ("IODC"). See Note 4.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Summary of Significant Accounting Policies	This Note 2 to Notes to Condensed Consolidated Financial Statements provides information and disclosure regarding certain of our significant accounting policies and should be read in conjunction with Note 2 to Notes to Consolidated Financial Statements included in our Annual Report, which may provide additional information with regard to the accounting policies set forth herein and other of our significant accounting policies. a. Cash, Cash Equivalents and Restricted Cash Cash and cash equivalents include cash on hand and cash invested in highly liquid short-term securities, which have remaining maturities at the date of purchase of less than 90 days . Cash and cash equivalents are carried at cost, which approximates fair value. At December 31, 2017 and March 31, 2018, we had approximately $22,167 and $18,360 , respectively, of restricted cash held by certain financial institutions related to bank guarantees. . Foreign Currency Local currencies are the functional currencies for our operations outside the United States, with the exception of certain foreign holding companies and our financing centers in Europe, whose functional currency is the United States dollar. In those instances where the local currency is the functional currency, assets and liabilities are translated at period-end exchange rates, and revenues and expenses are translated at average exchange rates for the applicable period. Resulting translation adjustments are reflected in the accumulated other comprehensive items, net component of Iron Mountain Incorporated Stockholders' Equity. The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, including those related to (i) borrowings in certain foreign currencies under our Former Revolving Credit Facility and Revolving Credit Facility (both as defined and discussed more fully in Note 5), (ii) our Euro Notes (as defined and discussed more fully in Note 5), and (iii) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested, are included in Other (income) expense, net, in the accompanying Condensed Consolidated Statements of Operations. Total (gain) loss on foreign currency transactions for the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Total (gain) loss on foreign currency transactions $ (4,164 ) $ 21,785 . Goodwill and Other Intangible Assets and Liabilities Goodwill Goodwill is not amortized but is reviewed annually for impairment, or more frequently if impairment indicators arise. We have selected October 1 as our annual goodwill impairment review date. We performed our most recent annual goodwill impairment review as of October 1, 2017 and as a result of that review, we determined that the fair value of the Consumer Storage reporting unit was less than its carrying value and, therefore, we recorded a $3,011 impairment charge on the goodwill associated with this reporting unit during the fourth quarter of 2017, which represents a write-off of all goodwill associated with this reporting unit. As of December 31, 2017 and March 31, 2018, no factors were identified that would alter our October 1, 2017 goodwill impairment analysis. In making this assessment, we considered a number of factors including operating results, business plans, anticipated future cash flows, transactions and marketplace data. There are inherent uncertainties related to these factors and our judgment in applying them to the analysis of goodwill impairment. When changes occur in the composition of one or more reporting units, the goodwill is reassigned to the reporting units affected based on their relative fair values. Our reporting units as of December 31, 2017 are described in detail in Note 2.h. to Notes to Consolidated Financial Statements included in our Annual Report. The goodwill associated with acquisitions completed during the first three months of 2018 (which are described in Note 4) has been incorporated into our reporting units as they existed as of December 31, 2017. During the first quarter of 2018, as a result of changes in the management of our businesses included in our Other International Business segment, we reassessed the composition of our reporting units. As a result of this reassessment, we determined that our business in South Africa, which was previously being managed in conjunction with our businesses in Northern and Eastern Europe and Middle East and India as a part of our former Northern and Eastern Europe and Middle East, Africa and India (“NEE and MEAI”) reporting unit, was now being managed in conjunction with our businesses included in our Australia and New Zealand reporting unit. This newly formed reporting unit, which consists of (i) the businesses included in our former Australia and New Zealand reporting unit and (ii) our business in South Africa is referred to as the Australia, New Zealand and South Africa (“ANZ-SA”) reporting unit. The former NEE and MEAI reporting unit is now referred to as the Northern and Eastern Europe and Middle East and India ("NEE and MEI") reporting unit. The changes in the carrying value of goodwill attributable to each reportable operating segment for the three months ended March 31, 2018 are as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate and Other Business Total Gross Balance as of December 31, 2017 $ 2,474,829 $ 551,726 $ 453,537 $ 846,721 $ — $ 60,048 $ 4,386,861 Non-deductible goodwill acquired during the year — — — — 229,539 — 229,539 Fair value and other adjustments(1) 122 — — 5,886 — 4,704 10,712 Currency effects (5,593 ) (1,528 ) 13,885 7,713 — 621 15,098 Gross Balance as of March 31, 2018 $ 2,469,358 $ 550,198 $ 467,422 $ 860,320 $ 229,539 $ 65,373 $ 4,642,210 Accumulated Amortization Balance as of December 31, 2017 $ 205,383 $ 53,875 $ 57,048 $ 288 $ — $ — $ 316,594 Currency effects (198 ) (50 ) 376 10 — — 138 Accumulated Amortization Balance as of March 31, 2018 $ 205,185 $ 53,825 $ 57,424 $ 298 $ — $ — $ 316,732 Net Balance as of December 31, 2017 $ 2,269,446 $ 497,851 $ 396,489 $ 846,433 $ — $ 60,048 $ 4,070,267 Net Balance as of March 31, 2018 $ 2,264,173 $ 496,373 $ 409,998 $ 860,022 $ 229,539 $ 65,373 $ 4,325,478 Accumulated Goodwill Impairment Balance as of December 31, 2017 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 Accumulated Goodwill Impairment Balance as of March 31, 2018 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 _______________________________________________________________________________ (1) Total fair value and other adjustments include $10,712 in net adjustments primarily related to property, plant and equipment, customer relationship intangible assets and deferred income taxes and other liabilities. Finite-lived intangible assets and liabilities i. Customer Relationship Intangible Assets Customer relationship intangible assets, which are acquired through either business combinations or acquisitions of customer relationships, are amortized over periods ranging from 10 to 30 years and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. The value of customer relationship intangible assets is calculated based upon estimates of their fair value utilizing an income approach based on the present value of expected future cash flows. ii. Customer Inducements Prior to the adoption of ASU 2014-09, free intake costs to transport boxes to one of our facilities, which include labor and transportation costs ("Free Move Costs"), were capitalized and amortized over periods ranging from 10 to 30 years. The amortization of Free Move Costs is included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations for the three months ended March 31, 2017. Subsequent to the adoption of ASU 2014-09, Free Move Costs are considered a Contract Fulfillment Cost (as defined in Note 2.d.) and, therefore, are now deferred and amortized over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. See Note 2.d. for information regarding the accounting for Free Move Costs, which are now a component of Intake Costs (as defined in Note 2.d.), following the adoption of ASU 2014-09. Payments that are made to a customer's current records management vendor in order to terminate the customer's existing contract with that vendor, or direct payments to a customer ("Permanent Withdrawal Fees"), are amortized over periods ranging from 5 to 15 years and are included in storage and service revenue in the accompanying Condensed Consolidated Statements of Operations. Our accounting for Permanent Withdrawl Fees did not change as a result of the adoption of ASU 2014-09. Free Move Costs (prior to the adoption of ASU 2014-09) and Permanent Withdrawal Fees are collectively referred to as "Customer Inducements". If the customer terminates its relationship with us, the unamortized carrying value of the Customer Inducement intangible asset is charged to expense or revenue. However, in the event of such termination, we generally collect, and record as income, permanent removal fees that generally equal or exceed the amount of the unamortized Customer Inducement intangible asset. iii. Data Center Intangible Assets and Liabilities Finite-lived intangible assets associated with our data center business consist of the following: Data Center In-Place Lease Intangible Assets and Data Center Tenant Relationship Intangible Assets Data Center In-Place Lease Intangible Assets (“Data Center In-Place Leases”) and Data Center Tenant Relationship Intangible Assets (“Data Center Tenant Relationships") are acquired through either business combinations or asset acquisitions in our data center business. These intangible assets reflect the value associated with acquiring a data center operation with active tenants as of the date of acquisition. The value of Data Center In-Place Leases is determined based upon an estimate of the economic costs (such as lost revenues and unreimbursed operating expenses during the lease-up period, tenant improvement costs, commissions, legal expenses and other costs to acquire new data center leases) avoided by acquiring a data center operation with active tenants that would have otherwise been incurred if the data center operation was purchased vacant. Data Center In-Place Leases are amortized over the weighted average remaining term of the acquired data center leases and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. The value of Data Center Tenant Relationships is determined based upon an estimate of the economic costs avoided upon lease renewal of the acquired tenants, based upon expectations of lease renewal. Data Center Tenant Relationships are amortized over the weighted average remaining anticipated life of the relationship with the acquired tenant and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. Data Center In-Place Leases and Data Center Tenant Relationships are included in Customer relationships, customer inducements and data center lease-based intangibles in the accompanying Condensed Consolidated Balance Sheets. Data Center Above-Market and Below-Market In-Place Lease Intangible Assets Data Center Above-Market In-Place Lease Intangible Assets (“Data Center Above-Market Leases”) and Data Center Below-Market In-Place Lease Intangible Assets (“Data Center Below-Market Leases”) are acquired through either business combinations or asset acquisitions in our data center business. We record Data Center Above-Market Leases and Data Center Below-Market Leases at the net present value of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of the fair market lease rates for each corresponding in-place lease. Data Center Above-Market Leases and Data Center Below-Market Leases are amortized over the remaining non-cancellable term of the acquired in-place lease to storage revenue in the accompanying Condensed Consolidated Statements of Operations. Data Center Above-Market Leases are included in Customer relationships, customer inducements and data center lease-based intangibles in the accompanying Condensed Consolidated Balance Sheets. Data Center Below-Market Leases are included in Other long-term liabilities in the accompanying Condensed Consolidated Balance Sheets. The components of our finite-lived intangible assets related to customer relationship value, customer inducements and data center lease-based intangible assets and liabilities as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Assets: Customer relationship intangible assets $ 1,704,105 $ (395,278 ) $ 1,308,827 $ 1,728,685 $ (427,550 ) $ 1,301,135 Customer inducements(1) 140,030 (66,981 ) 73,049 57,502 (35,149 ) 22,353 Data center lease-based intangible assets(2) 19,314 (643 ) 18,671 282,609 (13,609 ) 269,000 $ 1,863,449 $ (462,902 ) $ 1,400,547 $ 2,068,796 $ (476,308 ) $ 1,592,488 Liabilities: Data center below-market leases $ — $ — $ — $ 11,421 $ (349 ) $ 11,072 _______________________________________________________________________________ (1) The gross carrying amount, accumulated amortization and net carrying amount of customer inducements as of December 31, 2017 includes Free Move Costs, which were capitalized as Customer Inducements prior to the adoption of ASU 2014-09. Subsequent to the adoption of ASU 2014-09, Free Move Costs are considered a Contract Fulfillment Cost. Contract Fulfillment Costs are included in Other, a component of Other Assets, Net, in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2018. See Note 2.d. for information regarding Contract Fulfillment Costs included in our Condensed Consolidated Balance Sheet as of March 31, 2018. (2) Includes Data Center In-Place Leases, Data Center Tenant Relationships and Data Center Above-Market Leases. Other finite-lived intangible assets, including trade names, noncompetition agreements and trademarks, are capitalized and amortized over a weighted average of four years and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations for the three months ended March 31, 2017 and 2018. The other finite-lived intangible assets as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Other finite-lived intangible assets (included in other assets, net) $ 20,929 $ (10,728 ) $ 10,201 $ 20,974 $ (11,936 ) $ 9,038 Amortization expense associated with finite-lived intangible assets, revenue reduction associated with the amortization of Permanent Withdrawal Fees and net revenue reduction associated with the amortization of Data Center Above-Market Leases and Data Center Below-Market Leases for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended 2017 2018 Amortization expense included in depreciation and amortization associated with: Customer relationship intangible assets $ 20,133 $ 26,337 Customer inducements 2,666 2,469 Data center in-place leases and tenant relationships — 10,838 Other finite-lived intangible assets 2,316 1,185 Revenue reduction associated with amortization of: Permanent withdrawal fees $ 3,158 $ 2,585 Data center above-market leases and data center below-market leases — 1,079 d. Revenues In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09. ASU 2014-09 provides guidance for management to reassess revenue recognition as it relates to: (1) transfer of control, (2) variable consideration, (3) allocation of transaction price based on relative standalone selling price, (4) licenses, (5) time value of money, and (6) contract costs. We adopted ASU 2014-09 as of January 1, 2018 using the modified retrospective method for all of our customer contracts, whereby the cumulative effect of applying ASU 2014-09 is recognized at the date of initial application. At January 1, 2018, we recognized the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of (distributions in excess of earnings) earnings in excess of distributions, resulting in a decrease of $29,461 to stockholders' equity. The reduction of (distribution in excess of earnings) earnings in excess of distributions represents the net effect of (i) the write off of Free Move Costs, net (which were capitalized and amortized prior to the adoption of ASU 2014-09) based upon the net book value of the Free Move Costs as of December 31, 2017, (ii) the recognition of certain Contract Fulfillment Assets, specifically Intake Costs (each as defined below) and commission assets, (iii) the recognition of deferred revenue associated with Intake Costs billed to our customers (as discussed below), and (iv) the deferred income tax impact of the aforementioned items. As we adopted ASU 2014-09 on a modified retrospective basis, the comparative Condensed Consolidated Balance Sheet as of December 31, 2017, and the Condensed Consolidated Statement of Operations, the Condensed Consolidated Statement of Comprehensive Income (Loss), the Condensed Consolidated Statement of Equity and the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2017 have not been restated to reflect the adoption of ASU 2014-09 and reflect our revenue policies in place at that time, as disclosed in Note 2.l. to Notes to Consolidated Financial Statements included in our Annual Report. Storage rental and service revenues are recognized in the month the respective storage rental or service is provided, and customers are generally billed on a monthly basis on contractually agreed-upon terms. The performance obligation is a series of distinct services (as determined for purposes of ASU 2014-09, a “series”) that have the same pattern of transfer to the customer that is satisfied over time. For those contracts that qualify as a series, we have a right to consideration from the customer in an amount that corresponds directly with the value of the underlying performance obligation transferred to the customer to date. This concept is known as "right to invoice" and we are applying the "right to invoice" practical expedient to all revenues, with the exception of storage revenues in our data center business. For all of our businesses, with the exception of the storage component of our data center business, each purchasing decision is fully in the control of the customer and, therefore, consideration beyond the current reporting period is variable and allocated to the specific period, which is consistent with the practical expedient above. Our data center business features storage rental provided to the customer at contractually specified rates over a fixed contractual period. The storage rental revenue related to the storage component of our data center business is recognized on a straight-line basis over the contract term. The revenue related to the service component of our data center business is recognized in the period the data center access or related services are provided. Total data center revenues represent less than 5% of our total consolidated revenues at March 31, 2018. The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (“Contract Fulfillment Costs”). The following describes each of these Contract Fulfillment Costs recognized under ASC 2014-09: Intake Costs (and associated deferred revenue) Prior to the adoption of ASU 2014-09, intake costs incurred but not charged to a customer to transport records to our facilities (or Free Move Costs, as described in Note 2.c.), which include labor and transportation costs, were capitalized and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations. The initial movement of customer records into physical storage must take place prior to initiation of the storage of records and is not considered a separate performance obligation and, therefore, the costs of the initial intake of customer records into physical storage (“Intake Costs”) represent a contract fulfillment cost for the storage of records as the earnings process does not commence until a customer’s records or other assets are in our possession. Accordingly, upon the adoption of ASU 2014-09, all Intake Costs, regardless of whether or not the services associated with such initial moves are billed to the customer or are provided to the customer at no charge, will be deferred and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. Similarly, in instances where such Intake Costs are billed to the customer, the associated revenue will be deferred and recognized over the same three year period. Commissions Prior to the adoption of ASU 2014-09, commissions we paid related to our long-term storage contracts were expensed as incurred. Upon the adoption of ASU 2014-09, certain commission payments that are directly associated with the fulfillment of long-term storage contracts are capitalized and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. Certain direct commission payments associated with contracts with a duration of one year or less are expensed as incurred under the practical expedient which allows an entity to expense as incurred an incremental cost of obtaining a contract if the amortization period of the asset that the entity otherwise would have recognized is one year or less. The Contract Fulfillment Assets recorded as a result of the adoption of ASU 2014-09 as of January 1, 2018 and March 31, 2018 are as follows: January 1, 2018 (Date of Adoption of ASU 2014-09) March 31, 2018 Description Location in Balance Sheet Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Commissions asset Other (within Other Assets, Net) $ 42,072 $ (21,173 ) $ 20,899 $ 44,729 $ (24,781 ) $ 19,948 Intake Costs asset Other (within Other Assets, Net) 31,604 (14,954 ) 16,650 34,408 (17,875 ) 16,533 Amortization expense associated with the commissions asset and Intake Costs asset was $3,587 and $2,730 , respectively, for the three months ended March 31, 2018. Deferred revenue liabilities, associated with billed Intake Costs, recorded as a result of the adoption of ASU 2014-09 as of January 1, 2018 and March 31, 2018 are as follows: Description Location in Balance Sheet January 1, 2018 (Date of Adoption of ASU 2014-09) March 31, 2018 Deferred revenue - Current Deferred revenue $ 9,953 $ 10,482 Deferred revenue - Long-term Other Long-term Liabilities 9,453 9,639 The following table presents certain components of our Condensed Consolidated Statements of Operations as of March 31, 2018 as reported and if we had not adopted ASU 2014-09 on January 1, 2018: Three Months Ended March 31, 2018 (As Reported) Three Months Ended Revenues $ 1,042,458 $ 1,041,264 Operating Income $ 164,559 $ 165,319 Income from Continuing Operations $ 45,614 $ 46,374 Per Share Income from Continuing Operations - Basic $ 0.16 $ 0.16 Per Share Income from Continuing Operations - Diluted $ 0.16 $ 0.16 . Stock-Based Compensation We record stock-based compensation expense, utilizing the straight-line method, for the cost of stock options, restricted stock units ("RSUs"), performance units ("PUs") and shares of stock issued under our employee stock purchase plan ("ESPP") (together, "Employee Stock-Based Awards"). Stock-based compensation expense for Employee Stock-Based Awards for the three months ended March 31, 2017 and 2018 was $6,549 ( $5,777 after tax or $0.02 per basic and diluted share) and $7,384 ( $6,833 after tax or $0.02 per basic and diluted share), respectively. Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Condensed Consolidated Statements of Operations is as follows: Three Months Ended 2017 2018 Cost of sales (excluding depreciation and amortization) $ 28 $ 29 Selling, general and administrative expenses 6,521 7,355 Total stock-based compensation $ 6,549 $ 7,384 Stock Options A summary of our stock options outstanding as of March 31, 2018 by vesting terms is as follows: March 31, 2018 Stock Options Outstanding % of Stock Options Outstanding Three-year vesting period (10 year contractual life) 4,111,684 91.8 % Five-year vesting period (10 year contractual life) 366,855 8.2 % 4,478,539 100.0 % The weighted average fair value of stock options granted for the three months ended March 31, 2017 and 2018 was $4.26 and $3.50 per share, respectively. These values were estimated on the date of grant using the Black-Scholes option pricing model. The weighted average assumptions used for grants in the respective periods are as follows: Three Months Ended Weighted Average Assumptions 2017 2018 Expected volatility 25.8 % 25.4 % Risk-free interest rate 1.96 % 2.65 % Expected dividend yield 6 % 7 % Expected life 5.0 years 5.0 years Expected volatility is calculated utilizing daily historical volatility over a period that equates to the expected life of the option. The risk-free interest rate was based on the United States Treasury interest rates whose term is consistent with the expected life (estimated period of time outstanding) of the stock options. Expected dividend yield is considered in the option pricing model and represents our current annualized expected per share dividends over the current trade price of our common stock. The expected life of the stock options granted is estimated using the historical exercise behavior of employees. A summary of stock option activity for the three months ended March 31, 2018 is as follows: Stock Options Weighted Weighted Average Outstanding at December 31, 2017 3,671,740 $ 34.41 Granted 839,437 33.72 Exercised (20,223 ) 19.41 Forfeited (9,673 ) 35.12 Expired (2,742 ) 37.71 Outstanding at March 31, 2018 4,478,539 $ 34.34 7.58 $ 8,201 Options exercisable at March 31, 2018 2,498,039 $ 33.73 6.39 $ 7,815 Options expected to vest 1,831,809 $ 35.12 9.08 $ 367 The aggregate intrinsic value of stock options exercised for the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Aggregate intrinsic value of stock options exercised $ 1,912 $ 393 Restricted Stock Units Under our various equity compensation plans, we may also grant RSUs. Our RSUs generally have a vesting period of three years from the date of grant. However, RSUs granted to our non-employee directors vest immediately upon grant. All RSUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of RSUs in cash upon the vesting date of the associated RSU and will be forfeited if the RSU does not vest. The fair value of RSUs is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero). Cash dividends accrued and paid on RSUs for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended 2017 2018 Cash dividends accrued on RSUs $ 683 $ 721 Cash dividends paid on RSUs 1,855 2,043 The fair value of RSUs vested during the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Fair value of RSUs vested $ 14,026 $ 15,330 A summary of RSU activity for the three months ended March 31, 2018 is as follows: RSUs Weighted- Non-vested at December 31, 2017 1,071,469 $ 35.38 Granted 611,030 33.58 Vested (436,489 ) 35.12 Forfeited (24,035 ) 36.43 Non-vested at March 31, 2018 1,221,975 $ 34.55 Performance Units Under our various equity compensation plans, we may also make awards of PUs. For the majority of outstanding PUs, the number of PUs earned is determined based on our performance against predefined targets of revenue and return on invested capital ("ROIC") and, beginning with PUs granted in 2018, Adjusted EBITDA (as defined in Note 7). The number of PUs earned may range from 0% to 200% of the initial award. The number of PUs earned is determined based on our actual performance as compared to the targets at the end of a three -year performance period. Certain PUs that we grant will be earned based on a market condition associated with the total return on our common stock in relation to either (i) a subset of the Standard & Poor's 500 Index (for certain PUs granted prior to 2017), or (ii) the MSCI United States REIT Index (for certain PUs granted in 2017 and thereafter), rather than the revenue, ROIC and Adjusted EBITDA targets noted above. The number of PUs earned based on the applicable market condition may range from 0% to 200% of the initial award. All of our PUs will be settled in shares of our common stock and are subject to cliff vesting three years from the date of the original PU grant. PUs awarded to employees who terminate their employment during the three -year performance period and on or after attaining age 55 and completing 10 years of qualifying service are eligible for pro-rated vesting, subject to the actual achievement against the predefined targets or a market condition as discussed above, based on the number of full years of service completed following the grant date (but delivery of the shares remains deferred). As a result, PUs are generally expensed over the three-year performance period. All PUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of PUs in cash upon the settlement date of the associated PU and will be forfeited if the PU does not vest. Cash dividends accrued and paid on PUs for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended 2017 2018 Cash dividends accrued on PUs $ 324 $ 450 Cash dividends paid on PUs 205 644 The majority of our PUs are earned based on our performance against revenue, ROIC and, beginning with PUs granted in 2018, Adjusted EBITDA targets during their applicable performance period; therefore, we forecast the likelihood of achieving the predefined revenue, ROIC and Adjusted EBITDA targets in order to calculate the expected PUs to be earned. We record a compensation charge based on either the forecasted PUs to be earned (during the performance period) or the actual PUs earned (at the three-year anniversary of the grant date) over the vesting period for each of the awards. The fair value of PUs based on our performance against revenue, ROIC and Adjusted EBITDA targets is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero). For PUs earned based on a market condition, we utilize a Monte Carlo simulation to fair value these awards at the date of grant, and such fair value is expensed over the three-year performance period. As of March 31, 2018 , we expected 100% , 100% and 100% achievement of the predefined revenue, ROIC and Adjusted EBITDA targets associated with the awards of PUs made in 2016 , 2017 and 2018 , respectively. The fair value of earned PUs that vested during the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Fair value of earned PUs that vested $ 905 $ 3,033 A summary of PU activity for the three months ended March 31, 2018 is as follows: Original PU Adjustment(1) Total Weighted- Non-vested at December 31, 2017 717,878 (250,067 ) 467,811 $ 39.28 Granted 347,576 — 347,576 33.64 Vested (79,121 ) — (79,121 ) 38.34 Forfeited/Performance or Market Conditions Not Achieved (2,626 ) (49,881 ) (52,507 ) 38.28 Non-vested at March 31, 2018 983,707 (299,948 ) 683,759 $ 36.60 _______________________________________________________________________________ (1) Represents an increase or decrease in the number of original PUs awarded based on either the

Derivative Instruments and Hedg

Derivative Instruments and Hedging Activities	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Derivative Instruments and Hedging Activities Disclosure [Text Block]	Historically, we have entered into forward contracts to hedge our exposures associated with certain foreign currencies. At the maturity of the forward contracts, we may enter into new forward contracts to hedge movements in the underlying currencies. At the time of settlement, we either pay or receive the net settlement amount from the forward contract and recognize this amount in Other (income) expense, net in the Consolidated Statements of Operations as a realized foreign exchange gain or loss. At the end of each month, we mark the outstanding forward contracts to market and record an unrealized foreign exchange gain or loss for the mark-to-market valuation. We have not designated any of the forward contracts we have entered into as hedges. As of December 31, 2017, we had outstanding forward contracts to (i) purchase $138,823 United States dollars and sell 176,000 Canadian dollars, (ii) purchase 135,000 Euros and sell $160,757 United States dollars and (iii) purchase $114,390 United States dollars and sell 96,150 Euros to hedge our foreign exchange exposures. As of March 31, 2018, we had outstanding forward contracts to purchase 133,000 Euros and sell $165,799 United States dollars to hedge our foreign exchange exposures. During the three months ended March 31, 2017, there were no cash receipts or payments included in cash from operating activities from continuing operations related to settlements associated with foreign currency forward contracts. During the three months ended March 31, 2018, cash receipts included in cash from operating activities from continuing operations related to settlements associated with foreign currency forward contracts was $6,343 . Our policy is to record the fair value of each derivative instrument on a gross basis. The following table provides the fair value of our derivative instruments not designated as hedging instruments as of December 31, 2017 and March 31, 2018: Derivatives Not Designated as Hedging Instruments Balance Sheet Location December 31, 2017 March 31, 2018 Derivative assets Prepaid expenses and other $ 1,579 $ — Derivative liabilities Accrued expenses 2,329 1,102 (Gains) losses for our derivative instruments not recognized as hedging instruments for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended Derivatives Not Designated as Hedging Instruments Location of Loss (Gain) Recognized in Income on Derivative 2017 2018 Foreign exchange contracts Other (income) expense, net $ — $ (5,991 ) We have designated a portion of our (i) Euro denominated borrowings by IMI under our Former Revolving Credit Facility and (ii) Euro Notes (each as defined in Note 5) as a hedge of net investment of certain of our Euro denominated subsidiaries. For the three months ended March 31, 2017, we designated, on average, 49,600 Euros of our Euro denominated borrowings by IMI under our Former Revolving Credit Facility as a hedge of net investment of certain of our Euro denominated subsidiaries. For the three months ended March 31, 2018, we designated, on average, 164,244 Euros of our Euro Notes as a hedge of net investment of certain of our Euro denominated subsidiaries. As a result, we recorded the following foreign exchange (losses) gains related to the change in fair value of such debt due to currency translation adjustments, which is a component of accumulated other comprehensive items, net: Three Months Ended 2017 2018 Foreign exchange (losses) gains $ (1,072 ) $ (5,635 ) As of March 31, 2018 , cumulative net losses of $2,447 , net of tax, are recorded in accumulated other comprehensive items, net associated with this net investment hedge. In March 2018, we entered into interest rate swap agreements to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness. As of March 31, 2018, we have $350,000 in notional value of interest rate swap agreements outstanding, which expire in March 2022. Under the interest rate swap agreements, we receive variable rate interest payments associated with the notional amount of each interest rate swap, based upon one-month LIBOR, in exchange for the payment of fixed interest rate payments (at the fixed rate interest specified in the interest rate swap agreements). We have designated these interest rate swaps as cash flow hedges. Unrealized gains are recognized as assets while unrealized losses are recognized as liabilities. The fair value of the interest rate swaps are estimated using industry standard valuation models using market-based observable inputs, including interest rate curves (Level 2, as described in Note 2.i.). At March 31, 2018, we had a derivative liability of $185 , which was recorded as a component of Other Long-Term Liabilities on our Condensed Consolidated Balance Sheet, which represents the fair value of our interest rate swap agreements. We have recorded the change in fair value of the interest rate swap agreements to accumulated other comprehensive income. At March 31, 2018, we have recorded an unrealized loss of $185 within accumulated other comprehensive items, net associated with these agreements.

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Acquisitions	We account for acquisitions using the acquisition method of accounting, and, accordingly, the assets and liabilities acquired are recorded at their estimated fair values and the results of operations for each acquisition have been included in our consolidated results from their respective acquisition dates. a. Acquisition of IO Data Centers On January 10, 2018, we completed the acquisition of the United States operations of IODC, a leading data center colocation space and solutions provider based in Phoenix, Arizona, including the land and buildings associated with four data centers in Phoenix and Scottsdale, Arizona; Edison, New Jersey; and Columbus, Ohio (the “IODC Transaction”). At the closing of the IODC Transaction, we paid approximately $1,347,000 . In addition to the amount paid at the closing of the IODC Transaction, there is the potential of $35,000 in additional payments associated with the execution of future customer contracts. We have accounted for the IODC Transaction as an acquisition of a business in accordance with the guidance in ASU 2017-01, Business Combinations (Topic 805): Clarifying the Definition of a Business . The unaudited consolidated pro forma financial information (the "Pro Forma Financial Information") below summarizes the combined results of us and IODC on a pro forma basis as if the IODC Transaction had occurred on January 1, 2017. The Pro Forma Financial Information is presented for informational purposes and is not necessarily indicative of the results of operations that would have been achieved if the acquisition had taken place on January 1, 2017. The Pro Forma Financial Information, for all periods presented, includes our current estimates of purchase accounting adjustments (including amortization expenses from acquired intangible assets and depreciation of acquired property, plant and equipment). Through March 31, 2018 , we and IODC have collectively incurred $28,064 of operating expenditures to complete the IODC Transaction (including advisory and professional fees). These operating expenditures have been reflected within the results of operations in the Pro Forma Financial Information as if they were incurred on January 1, 2017. Three Months Ended March 31, 2017 2018 Total Revenues $ 973,757 $ 1,045,929 Income from Continuing Operations $ 17,431 $ 55,181 Per Share Income from Continuing Operations - Basic $ 0.06 $ 0.19 Per Share Income from Continuing Operations - Diluted $ 0.06 $ 0.19 In addition to our acquisition of IODC, we completed certain other acquisitions during 2017 and 2018. The Pro Forma Financial Information does not reflect these acquisitions due to the insignificant impact of these acquisitions on our consolidated results of operations. b. Other Noteworthy Acquisitions On March 8, 2018, in order to expand our data center operations into Europe and Asia, we acquired the operations of two data centers in London and Singapore from Credit Suisse International and Credit Suisse AG (together, "Credit Suisse") for the total of (i) 34,600 British pounds sterling and (ii) 81,000 Singapore dollars (or collectively, approximately $111,400 , based upon the exchange rates between the United States dollar and the British pound sterling and Singapore dollar on the closing date of the Credit Suisse transaction) (the “Credit Suisse Transaction”). As part of the Credit Suisse Transaction, Credit Suisse entered into a long-term lease with us to maintain existing data center operations. In November 2017, we entered into an agreement to acquire (i) the storage and information management assets and operations of Santa Fe Group A/S ("Santa Fe") in China (the “Santa Fe China Transaction”) for approximately 14,000 Euros and (ii) certain real estate property located in Beijing, China owned by Santa Fe (the “Beijing Property”) for approximately 9,000 Euros, representing a total purchase price of approximately 23,000 Euros, subject to customary purchase price adjustments. We closed on the Santa Fe China Transaction on December 29, 2017. The purchase price for the Santa Fe China Transaction was not paid until January 2018 and, therefore, we accrued for the purchase price of the Santa Fe China Transaction (which was approximately $16,800 , based upon the exchange rate between the Euro and the United States dollar on the closing date of the Santa Fe China Transaction) in our Consolidated Balance Sheet as of December 31, 2017 (the “Accrued Purchase Price”). The Accrued Purchase Price is presented as a component of the current portion of long-term debt in our Consolidated Balance Sheet as of December 31, 2017. We paid the purchase price of the Santa Fe China Transaction on January 3, 2018. We expect to close on the acquisition of the Beijing Property during the first half of 2018. The completion of the acquisition of the Beijing Property is subject to closing conditions; accordingly, we can provide no assurances that we will be able to complete the acquisition of the Beijing Property, that it will not be delayed or that the terms will remain the same. A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our 2018 acquisitions through March 31, 2018 is as follows: IODC Transaction Other Fiscal Year 2018 Acquisitions (excluding IODC) Total Cash Paid (gross of cash acquired)(1) $ 1,347,046 $ 112,947 $ 1,459,993 Purchase price holdbacks — 149 149 Total Consideration 1,347,046 113,096 1,460,142 Fair Value of Identifiable Assets Acquired: Cash 34,227 — 34,227 Accounts Receivable and Prepaid Expenses 7,070 558 7,628 Property, Plant and Equipment(2) 863,027 111,267 974,294 Customer Relationship Intangible Assets — 1,593 1,593 Data Center In-Place Leases 128,513 9,492 138,005 Data Center Tenant Relationships 102,850 — 102,850 Data Center Above-Market Leases 16,439 — 16,439 Accounts Payable, Accrued Expenses and Other Liabilities (23,198 ) — (23,198 ) Deferred Income Taxes — (9,814 ) (9,814 ) Data Center Below-Market Leases (11,421 ) — (11,421 ) Total Fair Value of Identifiable Net Assets Acquired 1,117,507 1,117,507 113,096 1,230,603 Goodwill Initially Recorded(3) $ 229,539 $ — $ 229,539 _______________________________________________________________________________ (1) Included in cash paid for acquisitions in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2018 is net cash acquired of $34,227 and contingent and other payments, net of $3,208 related to acquisitions made in previous years. The cash paid for the Accrued Purchase Price for the Santa Fe China Transaction is included in cash flows from financing activities (as a component of repayment of revolving credit, term loan and bridge facilities and other debt) in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2018. (2) Consists primarily of building, building improvements, leasehold improvements, racking structures and warehouse equipment. These assets are depreciated using the straight-line method with the useful lives as noted in Note 2.f. to Notes to Consolidated Financial Statements included in our Annual Report. (3) The goodwill associated with acquisitions is primarily attributable to the assembled workforce, expanded market opportunities and costs and other operating synergies anticipated upon the integration of the operations of us and the acquired businesses. Allocations of the purchase price for acquisitions made in 2017 and 2018 were based on estimates of the fair value of the net assets acquired and are subject to adjustment upon the finalization of the purchase price allocations. The accounting for business combinations (including the accounting for the acquisition of assets) requires estimates and judgments as to expectations for future cash flows of the acquired business, and the allocations of those cash flows to identifiable tangible and intangible assets, in determining the assets acquired and liabilities assumed. The fair values assigned to tangible and intangible assets acquired and liabilities assumed, including contingent consideration, are based on management's best estimates and assumptions, as well as other information compiled by management, including valuations that utilize customary valuation procedures and techniques. The estimates and assumptions underlying the initial valuations are subject to the collection of information necessary to complete the valuations within the measurement periods, which are up to one year from the respective acquisition dates. The preliminary purchase price allocations that are not finalized as of March 31, 2018 primarily relate to the final assessment of the fair values of intangible assets (primarily customer relationship intangible assets and data center lease-based intangible assets), property, plant and equipment (primarily building, building improvements and racking structures), operating leases, contingencies and income taxes (primarily deferred income taxes), primarily associated with the Bonded Transaction, the Santa Fe Transaction, the Fortrust Transaction (each as defined in Note 6 to Notes to Consolidated Financial Statements included in our Annual Report), the IODC Transaction and the Credit Suisse Transaction, as well as other acquisitions which closed in 2018. As the valuation of certain assets and liabilities for purposes of purchase price allocations are preliminary in nature, they are subject to adjustment as additional information is obtained about the facts and circumstances regarding these assets and liabilities that existed at the acquisition date. Any adjustments to our estimates of purchase price allocation will be made in the periods in which the adjustments are determined and the cumulative effect of such adjustments will be calculated as if the adjustments had been completed as of the acquisition dates. Adjustments recorded during the three months ended March 31, 2018 were not material to our results from operations.

Debt

Debt	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Debt	Long-term debt is as follows: December 31, 2017 March 31, 2018 Debt (inclusive of discount) Unamortized Deferred Financing Costs Carrying Amount Fair Debt (inclusive of discount) Unamortized Deferred Financing Costs Carrying Amount Fair Revolving Credit Facility $ 466,593 $ (14,407 ) $ 452,186 $ 466,593 $ 800,158 $ (13,688 ) $ 786,470 $ 800,158 Term Loan A 243,750 — 243,750 243,750 240,625 — 240,625 240,625 Term Loan B — — — — 698,250 (8,698 ) 689,552 700,000 Australian Dollar Term Loan (the "AUD Term Loan") 187,504 (3,382 ) 184,122 189,049 259,431 (3,761 ) 255,670 261,662 4 3 / 8 % Senior Notes due 2021 (the "4 3 / 8 % Notes")(1)(2) 500,000 (5,874 ) 494,126 507,500 500,000 (5,444 ) 494,556 501,250 6% Senior Notes due 2023 (the "6% Notes due 2023")(1) 600,000 (6,224 ) 593,776 625,500 600,000 (5,949 ) 594,051 618,000 5 3 / 8 % CAD Senior Notes due 2023 (the "CAD Notes due 2023")(2)(3) 199,171 (3,295 ) 195,876 208,631 193,826 (3,067 ) 190,759 196,482 5 3 / 4 % Senior Subordinated Notes due 2024 (the "5 3 / 4 % Notes")(1) 1,000,000 (9,156 ) 990,844 1,012,500 1,000,000 (8,812 ) 991,188 970,000 3% Euro Senior Notes due 2025 (the "Euro Notes")(1)(2) 359,386 (4,691 ) 354,695 364,776 369,711 (4,567 ) 365,144 366,014 3 7 / 8 % GBP Senior Notes due 2025 (the "GBP Notes due 2025")(2) 539,702 (7,718 ) 531,984 527,559 560,516 (7,758 ) 552,758 529,789 5 3 / 8 % Senior Notes due 2026 (the "5 3 / 8 % Notes")(2) 250,000 (3,615 ) 246,385 256,875 250,000 (3,508 ) 246,492 240,313 4 7 / 8 % Senior Notes due 2027 (the "4 7 / 8 % Notes")(1)(2) 1,000,000 (13,866 ) 986,134 1,000,000 1,000,000 (13,509 ) 986,491 927,500 5 1 / 4 % Senior Notes due 2028 (the "5 1 / 4 % Notes")(1)(2) 825,000 (11,817 ) 813,183 826,031 825,000 (11,817 ) 813,183 773,438 Real Estate Mortgages, Capital Leases and Other 649,432 (566 ) 648,866 649,432 630,868 (451 ) 630,417 630,868 Accounts Receivable Securitization Program 258,973 (356 ) 258,617 258,973 272,273 (321 ) 271,952 272,273 Mortgage Securitization Program 50,000 (1,273 ) 48,727 50,000 50,000 (1,237 ) 48,763 50,000 Total Long-term Debt 7,129,511 (86,240 ) 7,043,271 8,250,658 — (92,587 ) 8,158,071 Less Current Portion (146,300 ) — (146,300 ) (137,198 ) — (137,198 ) Long-term Debt, Net of Current Portion $ 6,983,211 $ (86,240 ) $ 6,896,971 $ 8,113,460 $ (92,587 ) $ 8,020,873 ______________________________________________________________ (1) Collectively, the "Parent Notes". (2) Collectively, the "Unregistered Notes". (3) Together, with our previously outstanding 6 1 / 8 % CAD Senior Notes due 2021 (the "CAD Notes due 2021"), the "CAD Notes". See Note 4 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding our long-term debt, including the direct obligors of each of our debt instruments as well as information regarding the fair value of our debt instruments (including the levels of the fair value hierarchy used to determine the fair value of our debt instruments). The levels of the fair value hierarchy used to determine the fair value of our debt as of March 31, 2018 are consistent with the levels of the fair value hierarchy used to determine the fair value of our debt as of December 31, 2017 (which are disclosed in our Annual Report). Additionally, see Note 6 for information regarding which of our consolidated subsidiaries guarantee certain of our debt instruments. a. Credit Agreement On August 21, 2017, we entered into a new credit agreement (as amended, the "Credit Agreement") which amended and restated our then existing credit agreement (the "Former Credit Agreement") which consisted of a revolving credit facility (the "Former Revolving Credit Facility") and a term loan (the "Former Term Loan") and was scheduled to terminate on July 6, 2019. The Credit Agreement consists of a revolving credit facility (the "Revolving Credit Facility") and a term loan (the "Term Loan A"). The maximum amount permitted to be borrowed under the Revolving Credit Facility is $1,750,000 . The original amount of the Term Loan A was $250,000 . On March 22, 2018, we entered into an amendment (the “2018 Amendment”) to the Credit Agreement which provided us with the option to request additional commitments of up to $1,260,000 under the Credit Agreement, in the form of term loans or through increased commitments under the Revolving Credit Facility, subject to the conditions specified in the Credit Agreement, as amended. The Credit Agreement is scheduled to mature on August 21, 2022, at which point all obligations become due. The Revolving Credit Facility enables IMI and certain of its United States and foreign subsidiaries to borrow in United States dollars and (subject to sublimits) a variety of other currencies (including Canadian dollars, British pounds sterling and Euros, among other currencies) in an aggregate outstanding amount not to exceed $1,750,000 . The Term Loan A is being paid in quarterly installments in an amount equal to $3,125 per quarter, with the remaining balance due on August 21, 2022. IMI and the Guarantors guarantee all obligations under the Credit Agreement. The interest rate on borrowings under the Credit Agreement varies depending on our choice of interest rate and currency options, plus an applicable margin, which varies based on our consolidated leverage ratio. Additionally, the Credit Agreement requires the payment of a commitment fee on the unused portion of the Revolving Credit Facility, which fee ranges from between 0.25% to 0.4% based on our consolidated leverage ratio and fees associated with outstanding letters of credit. As of March 31, 2018, we had $800,158 and $240,625 of outstanding borrowings under the Revolving Credit Facility and the Term Loan A, respectively. Of the $800,158 of outstanding borrowings under the Revolving Credit Facility, $548,000 was denominated in United States dollars, 179,000 was denominated in Canadian dollars and 92,000 was denominated in Euros. In addition, we also had various outstanding letters of credit totaling $54,673 . The remaining amount available for borrowing under the Revolving Credit Facility as of March 31, 2018, which is based on IMI's leverage ratio, the last 12 months' earnings before interest, taxes, depreciation and amortization and rent expense ("EBITDAR"), other adjustments as defined in the Credit Agreement and current external debt, was $895,169 (which amount represents the maximum availability as of such date). The average interest rate in effect under the Credit Agreement was 3.3% as of March 31, 2018 . The average interest rate in effect under the Revolving Credit Facility as of March 31, 2018 was 3.3% and ranged from 1.8% to 5.5% as of March 31, 2018 and the interest rate in effect under the Term Loan A as of March 31, 2018 was 3.6% . The capital stock or other equity interests of most of our United States subsidiaries, and up to 66% of the capital stock or other equity interests of most of our first-tier foreign subsidiaries, are pledged to secure borrowings under the Credit Agreement, together with all intercompany obligations (including promissory notes) of subsidiaries owed to us or to one of our United States subsidiary guarantors. In addition, Iron Mountain Canada Operations ULC ("Canada Company") has pledged 66% of the capital stock of its subsidiaries, and all intercompany obligations (including promissory notes) owed to or held by it, to secure the Canadian dollar subfacility under the Revolving Credit Facility. On March 22, 2018, in connection with the 2018 Amendment, Iron Mountain Information Management, LLC ("IMIM") entered into an incremental term loan activation notice, or the Activation Notice, with certain lenders pursuant to which the lenders party to the Activation Notice agreed to provide commitments to fund an incremental term loan B in the amount of $700,000 (the “Term Loan B”). On March 26, 2018, we borrowed the full amount of the Term Loan B, which matures on January 2, 2026. The Term Loan B was issued at 99.75% of par. The aggregate net proceeds of approximately $689,850 , after paying commissions to the joint lead arrangers and net of the original discount, were used to repay outstanding borrowings under the Revolving Credit Facility. The Term Loan B holders benefit from the same security and guarantees as other borrowings under the Credit Agreement. The Term Loan B holders also benefit from the same affirmative and negative covenants as other borrowings under the Credit Agreement; however, the Term Loan B holders are not generally entitled to the benefits of the financial covenants under the Credit Agreement. Principal payments on the Term Loan B are to be paid in quarterly installments of $1,750 per quarter during the period June 30, 2018 through December 31, 2025, with the balance due on January 2, 2026. The Term Loan B may be prepaid without penalty at any time after the six month anniversary of the borrowing date. The Term Loan B bears interest at a rate of LIBOR plus 1.75% . At March 31, 2018, we had $700,000 outstanding on the Term Loan B and the interest rate in effect under the Term Loan B was 3.6% . The amount of debt for the Term Loan B reflects an unamortized original issue discount of $1,750 as of March 31, 2018. The Credit Agreement, our indentures and other agreements governing our indebtedness contain certain restrictive financial and operating covenants, including covenants that restrict our ability to complete acquisitions, pay cash dividends, incur indebtedness, make investments, sell assets and take certain other corporate actions. The covenants do not contain a rating trigger. Therefore, a change in our debt rating would not trigger a default under the Credit Agreement, our indentures or other agreements governing our indebtedness. The Credit Agreement uses EBITDAR-based calculations as the primary measures of financial performance, including leverage and fixed charge coverage ratios. Our leverage and fixed charge coverage ratios under the Credit Agreement as of December 31, 2017 and March 31, 2018, as well as our leverage ratio under our indentures as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Maximum/Minimum Allowable Net total lease adjusted leverage ratio 5.0 5.6 Maximum allowable of 6.5 Net secured debt lease adjusted leverage ratio 1.6 2.4 Maximum allowable of 4.0 Bond leverage ratio (not lease adjusted) 5.8 5.8 Maximum allowable of 6.5-7.0(1)(2) Fixed charge coverage ratio 2.1 2.2 Minimum allowable of 1.5 ______________________________________________________________ (1) The maximum allowable leverage ratio under our indentures for the 4 7 / 8 % Notes, the GBP Notes due 2025 and the 5 1 / 4 % Notes is 7.0 , while the maximum allowable leverage ratio under the indentures pertaining to our remaining senior and senior subordinated notes is 6.5 . In certain instances as provided in our indentures, we have the ability to incur additional indebtedness that would result in our bond leverage ratio exceeding the maximum allowable ratio under our indentures and still remain in compliance with the covenant. (2) At December 31, 2017, a portion of the net proceeds from the 5 1 / 4 % Notes, together with a portion of the net proceeds of the Equity Offering (as defined in Note 9), were used to temporarily repay approximately $807,000 of outstanding indebtedness under our Revolving Credit Facility until the closing of the IODC Transaction, which occurred on January 10, 2018 (as described in Note 4). The bond leverage ratio at December 31, 2017 is calculated based on our outstanding indebtedness at this date, which reflects the temporary payment of the Revolving Credit Facility. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity. b. Australian Dollar Term Loan On March 27, 2018, Iron Mountain Australia Group Pty Ltd, a wholly owned subsidiary of IMI, amended its AUD Term Loan (the "AUD Term Loan Amendment") to (i) increase the borrowings under the AUD Term Loan from 250,000 Australian dollars to 350,000 Australian dollars; (ii) increase the quarterly principal payments from 6,250 Australian dollars per year to 8,750 Australian dollars per year and (iii) decrease the interest rate on the AUD Term Loan from BBSY (an Australian benchmark variable interest rate) plus 4.3% to BBSY plus 3.875% . The AUD Term Loan matures in September 2022. All indebtedness associated with the AUD Term Loan was issued at 99% of par. The net proceeds associated with the AUD Term Loan Amendment of approximately 99,000 Australian dollars (or approximately $75,621 , based on the exchange rate between the Australian dollar and the United States dollar on March 29, 2018 (the closing date of the AUD Term Loan Amendment)), net of the original discount, were used to repay outstanding borrowings under the Revolving Credit Facility. Principal payments on the AUD Term Loan are to be paid in quarterly installments in an amount equivalent to an aggregate of 8,750 Australian dollars per year, with the remaining balance due September 22, 2022. The AUD Term Loan is secured by substantially all assets of Iron Mountain Australia Group Pty. Ltd. IMI and its direct and indirect 100% owned United States subsidiaries that represent the substantial majority of its United States operations (the “Guarantors”) guarantee all obligations under the AUD Term Loan. As of March 31, 2018, we had 340,625 Australian dollars ( $261,662 based upon the exchange rate between the United States dollar and the Australian dollar as of March 31, 2018 ) outstanding on the AUD Term Loan and the interest rate in effect under the AUD Term Loan was 5.9% . The amount of debt for the AUD Term Loan reflects an unamortized original issue discount of $1,545 and $2,231 as of December 31, 2017 and March 31, 2018, respectively. c. Accounts Receivable Securitization Program We are a party to a $275,000 accounts receivable securitization program (the "Accounts Receivable Securitization Program") involving several of our wholly owned subsidiaries and certain financial institutions, which matures on July 30, 2020, at which point all obligations become due. Under the Accounts Receivable Securitization Program, certain of our subsidiaries sell substantially all of their United States accounts receivable balances to our wholly owned special purpose entities, Iron Mountain Receivables QRS, LLC and Iron Mountain Receivables TRS, LLC (the "Accounts Receivable Securitization Special Purpose Subsidiaries"). The Accounts Receivable Securitization Special Purpose Subsidiaries use the accounts receivable balances to collateralize loans obtained from certain financial institutions. The Accounts Receivable Securitization Special Purpose Subsidiaries are consolidated subsidiaries of IMI. The Accounts Receivable Securitization Program is accounted for as a collateralized financing activity, rather than a sale of assets, and therefore: (i) accounts receivable balances pledged as collateral are presented as assets and borrowings are presented as liabilities on our Condensed Consolidated Balance Sheets, (ii) our Condensed Consolidated Statements of Operations reflect the associated charges for bad debt expense related to pledged accounts receivable (a component of selling, general and administrative expenses) and reductions to revenue due to billing and service related credit memos issued to customers and related reserves, as well as interest expense associated with the collateralized borrowings and (iii) receipts from customers related to the underlying accounts receivable are reflected as operating cash flows and borrowings and repayments under the collateralized loans are reflected as financing cash flows within our Condensed Consolidated Statements of Cash Flows. IMIM retains the responsibility of servicing the accounts receivable balances pledged as collateral for the Accounts Receivable Securitization Program and IMI provides a performance guaranty. The maximum availability allowed under the Accounts Receivable Securitization Program is limited by eligible accounts receivable, as defined under the terms of the Accounts Receivable Securitization Program. As of March 31, 2018 , the maximum availability allowed and amount outstanding under the Accounts Receivable Securitization Program was $272,273 . The interest rate in effect under the Accounts Receivable Securitization Program was 2.9% as of March 31, 2018 . d. Cash Pooling Certain of our subsidiaries participate in cash pooling arrangements (the “Cash Pools”) with Bank Mendes Gans (“BMG”), an independently operated fully-owned subsidiary of ING Group, in order to help manage global liquidity requirements. Under the Cash Pools, cash deposited by participating subsidiaries with BMG is pledged as security against the debit balances of other participating subsidiaries, and legal rights of offset are provided and, therefore, amounts are presented in our Condensed Consolidated Balance Sheets on a net basis. Each subsidiary receives interest on the cash balances held on deposit or pays interest on its debit balances based on an applicable rate as defined in the Cash Pools. We currently utilize two separate cash pools with BMG, one of which we utilize to manage global liquidity requirements for our QRSs (the "QRS Cash Pool") and the other for our TRSs (the "TRS Cash Pool"). As of December 31, 2017, we had a net cash position of approximately $5,700 in the QRS Cash Pool (which consisted of a gross cash position of approximately $383,700 less outstanding debit balances of approximately $378,000 by participating subsidiaries) and we had a zero balance in the TRS Cash Pool (which consisted of a gross cash position of approximately $229,600 less outstanding debit balances of approximately $229,600 by participating subsidiaries). As of March 31, 2018, we had a net cash position of approximately $2,600 in the QRS Cash Pool (which consisted of a gross cash position of approximately $389,200 less outstanding debit balances of approximately $386,600 by participating subsidiaries) and we had a $18,900 balance in the TRS Cash Pool (which consisted of a gross cash position of approximately $262,400 less outstanding debit balances of approximately $243,500 by participating subsidiaries). The net cash position balances as of December 31, 2017 and March 31, 2018 are reflected as cash and cash equivalents in the Condensed Consolidated Balance Sheets.

Selected Consolidated Financial

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors	3 Months Ended
	Mar. 31, 2018
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors	The following data summarizes the consolidating results of IMI on the equity method of accounting as of December 31, 2017 and March 31, 2018 and for the three months ended March 31, 2017 and 2018 and are prepared on the same basis as the consolidated financial statements. The Parent Notes, CAD Notes, the 6 1 / 8 % GBP Senior Notes due 2022 (the "GBP Notes due 2022") (which were redeemed in November 2017), GBP Notes due 2025, and the 5 3 / 8 % Notes are guaranteed by the subsidiaries referred to below as the Guarantors. These subsidiaries are 100% owned by IMI. The guarantees are full and unconditional, as well as joint and several. Additionally, IMI guarantees the CAD Notes, which were issued by Canada Company, the GBP Notes due 2022, which were issued by Iron Mountain Europe PLC ("IME"), the GBP Notes due 2025, which were issued by Iron Mountain (UK) PLC ("IM UK"), and the 5 3 / 8 % Notes, which were issued by Iron Mountain US Holdings, Inc, which is one of the Guarantors. Canada Company, IME and IM UK do not guarantee the Parent Notes. The subsidiaries that do not guarantee the Parent Notes, the CAD Notes, the GBP Notes due 2022, the GBP Notes due 2025, and the 5 3 / 8 % Notes, including IME, IM UK, the Accounts Receivable Securitization Special Purpose Subsidiaries and Iron Mountain Mortgage Finance I, LLC (the "Mortgage Securitization Special Purpose Subsidiary"), are referred to below as the Non-Guarantors. As discussed below, the results of the Non-Guarantors for the three months ended March 31, 2017 exclude the results of Canada Company, as those are presented in a separate column. The CAD Notes due 2021 were issued by Canada Company and registered under the Securities Act of 1933, as amended (the “Securities Act”). The CAD Notes due 2023 have not been registered under the Securities Act, or under the securities laws of any other jurisdiction. We redeemed the CAD Notes due 2021 in August 2017 and, therefore, as of that date, Canada Company had no outstanding debt registered under the Securities Act that would require the presentation of Canada Company on a standalone basis in the accompanying consolidating financial statements. Accordingly, (i) the assets, liabilities and equity of Canada Company are presented as a component of the Non-Guarantor subsidiaries in the accompanying Condensed Consolidated Balance Sheets as of December 31, 2017 and March 31, 2018, respectively, (ii) the revenues, expenses and other comprehensive income (loss) of Canada Company are presented as a component of the Non-Guarantor subsidiaries in the Condensed Consolidated Statement of Operations and Comprehensive Income (Loss) for the three months ended March 31, 2018, and (iii) the operating, investing and financing cash flows for Canada Company are presented as a component of the Non-Guarantor subsidiaries in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2018. In the normal course of business, we periodically change the ownership structure of our subsidiaries to meet the requirements of our business. In the event of such changes, we recast the prior period financial information within this footnote to conform to the current period presentation in the period such changes occur. Generally, these changes do not alter the designation of the underlying subsidiaries as Guarantors or Non-Guarantors. However, they may change whether the underlying subsidiary is owned by the Parent, a Guarantor or a Non-Guarantor. If such a change occurs, the amount of investment in subsidiaries in the below Condensed Consolidated Balance Sheets and equity in the earnings (losses) of subsidiaries, net of tax in the below Condensed Consolidated Statements of Operations and Comprehensive Income (Loss) with respect to the relevant Parent, Guarantors, Non-Guarantors and Eliminations columns also would change. CONDENSED CONSOLIDATED BALANCE SHEETS December 31, 2017 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 2,433 $ 634,317 $ 383,675 $ (94,726 ) $ 925,699 Accounts receivable — 32,972 802,770 — 835,742 Intercompany receivable 332,293 149,731 — (482,024 ) — Prepaid expenses and other 1,579 103,643 83,681 (29 ) 188,874 Total Current Assets 336,305 920,663 1,270,126 (576,779 ) 1,950,315 Property, Plant and Equipment, Net 316 2,030,875 1,386,488 — 3,417,679 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,578,995 — — (4,578,995 ) — Investment in subsidiaries 1,858,045 885,999 — (2,744,044 ) — Goodwill — 2,577,310 1,492,957 — 4,070,267 Other — 796,913 737,228 — 1,534,141 Total Other Assets, Net 6,437,040 4,260,222 2,230,185 (7,323,039 ) 5,604,408 Total Assets $ 6,773,661 $ 7,211,760 $ 4,886,799 $ (7,899,818 ) $ 10,972,402 Liabilities and Equity Intercompany Payable $ — $ — $ 482,024 $ (482,024 ) $ — Debit Balances Under Cash Pools — 56,233 38,493 (94,726 ) — Current Portion of Long-Term Debt — 54,247 92,082 (29 ) 146,300 Total Other Current Liabilities 235,062 527,549 421,262 — 1,183,873 Long-Term Debt, Net of Current Portion 4,232,759 758,166 1,906,046 — 6,896,971 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,578,995 — (4,578,995 ) — Other Long-term Liabilities — 113,024 241,974 — 354,998 Commitments and Contingencies (See Note 8) Redeemable Noncontrolling Interests 8,402 — 83,016 — 91,418 Total Iron Mountain Incorporated Stockholders' Equity 2,297,438 1,123,546 1,620,498 (2,744,044 ) 2,297,438 Noncontrolling Interests — — 1,404 — 1,404 Total Equity 2,297,438 1,123,546 1,621,902 (2,744,044 ) 2,298,842 Total Liabilities and Equity $ 6,773,661 $ 7,211,760 $ 4,886,799 $ (7,899,818 ) $ 10,972,402 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at December 31, 2017 is approximately $38,400 and $62,000 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. See Note 5 for more information on our Cash Pools. CONDENSED CONSOLIDATED BALANCE SHEETS (Continued) March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491 Accounts receivable — 28,731 830,375 — 859,106 Intercompany receivable 172,289 82,219 — (254,508 ) — Prepaid expenses and other — 125,373 97,932 (29 ) 223,276 Total Current Assets 175,483 311,384 1,323,590 (285,584 ) 1,524,873 Property, Plant and Equipment, Net 283 2,935,396 1,429,792 — 4,365,471 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,662,099 — — (4,662,099 ) — Investment in subsidiaries 1,875,464 893,419 — (2,768,883 ) — Goodwill — 2,813,151 1,512,327 — 4,325,478 Other — 1,027,985 754,342 — 1,782,327 Total Other Assets, Net 6,537,563 4,734,555 2,266,669 (7,430,982 ) 6,107,805 Total Assets $ 6,713,329 $ 7,981,335 $ 5,020,051 $ (7,716,566 ) $ 11,998,149 Liabilities and Equity Intercompany Payable $ — $ — $ 254,508 $ (254,508 ) $ — Debit Balances Under Cash Pools — 4,287 26,760 (31,047 ) — Current Portion of Long-Term Debt — 60,778 76,449 (29 ) 137,198 Total Other Current Liabilities 199,577 487,627 406,660 — 1,093,864 Long-Term Debt, Net of Current Portion 4,244,612 1,514,579 2,261,682 — 8,020,873 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,662,099 — (4,662,099 ) — Other Long-term Liabilities 185 120,998 270,879 — 392,062 Commitments and Contingencies (See Note 8) Redeemable Noncontrolling Interests 9,208 — 83,669 — 92,877 Total Iron Mountain Incorporated Stockholders' Equity 2,259,747 1,130,967 1,637,916 (2,768,883 ) 2,259,747 Noncontrolling Interests — — 1,528 — 1,528 Total Equity 2,259,747 1,130,967 1,639,444 (2,768,883 ) 2,261,275 Total Liabilities and Equity $ 6,713,329 $ 7,981,335 $ 5,020,051 $ (7,716,566 ) $ 11,998,149 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at March 31, 2018 is approximately $45,600 and $6,900 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. See Note 5 for more information on our Cash Pools. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2017 Parent Guarantors Canada Non- Eliminations Consolidated Revenues: Storage rental $ — $ 349,351 $ 32,006 $ 190,922 $ — $ 572,279 Service — 218,209 16,050 132,338 — 366,597 Intercompany revenues — 1,097 — 22,342 (23,439 ) — Total Revenues — 568,657 48,056 345,602 (23,439 ) 938,876 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 239,329 7,550 179,828 — 426,707 Selling, general and administrative 79 162,705 3,561 73,821 — 240,166 Intercompany cost of sales — 6,606 15,736 1,097 (23,439 ) — Depreciation and amortization 46 76,161 4,238 44,262 — 124,707 (Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net — (548 ) 2 87 — (459 ) Total Operating Expenses 125 484,253 31,087 299,095 (23,439 ) 791,121 Operating (Loss) Income (125 ) 84,404 16,969 46,507 — 147,755 Interest Expense (Income), Net 42,784 (3,279 ) 11,670 34,880 — 86,055 Other Expense (Income), Net 81 2,519 (27 ) (8,937 ) — (6,364 ) (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (42,990 ) 85,164 5,326 20,564 — 68,064 Provision (Benefit) for Income Taxes — 12,744 (3,488 ) (36 ) — 9,220 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (101,115 ) (23,413 ) (157 ) (8,814 ) 133,499 — Income (Loss) from Continuing Operations 58,125 95,833 8,971 29,414 (133,499 ) 58,844 Income (Loss) from Discontinued Operations — 198 — (535 ) — (337 ) Net Income (Loss) 58,125 96,031 8,971 28,879 (133,499 ) 58,507 Less: Net Income (Loss) Attributable to Noncontrolling Interests — — — 382 — 382 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 58,125 $ 96,031 $ 8,971 $ 28,497 $ (133,499 ) $ 58,125 Net Income (Loss) $ 58,125 $ 96,031 $ 8,971 $ 28,879 $ (133,499 ) $ 58,507 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments (1,072 ) — 635 51,221 — 50,784 Equity in Other Comprehensive Income (Loss) of Subsidiaries 52,406 28,540 287 635 (81,868 ) — Total Other Comprehensive Income (Loss) 51,334 28,540 922 51,856 (81,868 ) 50,784 Comprehensive Income (Loss) 109,459 124,571 9,893 80,735 (215,367 ) 109,291 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — — (168 ) — (168 ) Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 109,459 $ 124,571 $ 9,893 $ 80,903 $ (215,367 ) $ 109,459 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Continued) Three Months Ended March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Revenues: Storage rental $ — $ 396,476 $ 254,673 $ — $ 651,149 Service — 230,230 161,079 — 391,309 Intercompany revenues — 1,205 4,491 (5,696 ) — Total Revenues — 627,911 420,243 (5,696 ) 1,042,458 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 246,163 202,558 — 448,721 Selling, general and administrative 43 185,348 84,339 — 269,730 Intercompany cost of sales — 4,491 1,205 (5,696 ) — Depreciation and amortization 33 102,446 58,099 — 160,578 (Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net — (356 ) (774 ) — (1,130 ) Total Operating Expenses 76 538,092 345,427 (5,696 ) 877,899 Operating Income (Loss) (76 ) 89,819 74,816 — 164,559 Interest Expense (Income), Net 49,941 (1,508 ) 49,193 — 97,626 Other Expense (Income), Net (1,157 ) 1,560 19,748 — 20,151 (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (48,860 ) 89,767 5,875 — 46,782 Provision (Benefit) for Income Taxes — (6,712 ) 7,880 — 1,168 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (93,544 ) 2,865 — 90,679 — Income (Loss) from Continuing Operations 44,684 93,614 (2,005 ) (90,679 ) 45,614 (Loss) Income from Discontinued Operations, Net of Tax — (422 ) (40 ) — (462 ) Net Income (Loss) 44,684 93,192 (2,045 ) (90,679 ) 45,152 Less: Net (Loss) Income Attributable to Noncontrolling Interests — — 468 — 468 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 44,684 $ 93,192 $ (2,513 ) $ (90,679 ) $ 44,684 Net Income (Loss) $ 44,684 $ 93,192 $ (2,045 ) $ (90,679 ) $ 45,152 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments (5,635 ) — 37,286 — 31,651 Change in fair value of interest rate swap agreements (185 ) — — — (185 ) Equity in Other Comprehensive Income (Loss) of Subsidiaries 35,732 38,336 — (74,068 ) — Total Other Comprehensive Income (Loss) 29,912 38,336 37,286 (74,068 ) 31,466 Comprehensive Income (Loss) 74,596 131,528 35,241 (164,747 ) 76,618 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — 2,027 — 2,027 Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 74,596 $ 131,528 $ 33,214 $ (164,747 ) $ 74,591 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2017 Parent Guarantors Canada Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (41,288 ) $ 136,411 $ 5,291 $ 21,760 $ — $ 122,174 Cash Flows from Operating Activities—Discontinued Operations — 198 (535 ) — — (337 ) Cash Flows from Operating Activities (41,288 ) 136,609 4,756 21,760 — 121,837 Cash Flows from Investing Activities: Capital expenditures — (53,175 ) (2,555 ) (17,472 ) — (73,202 ) Cash paid for acquisitions, net of cash acquired — (6,380 ) — (5,807 ) — (12,187 ) Intercompany loans to subsidiaries (1,187 ) (72,807 ) — (478 ) 74,472 — Investment in subsidiaries (16,170 ) — — — 16,170 — Acquisitions of customer relationships and customer inducements — (20,653 ) (271 ) (479 ) — (21,403 ) Net proceeds from Divestments (see Note 10) — — — 2,423 — 2,423 Proceeds from sales of property and equipment and other, net (including real estate) — 93 2 (29 ) — 66 Cash Flows from Investing Activities—Continuing Operations (17,357 ) (152,922 ) (2,824 ) (21,842 ) 90,642 (104,303 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — — Cash Flows from Investing Activities (17,357 ) (152,922 ) (2,824 ) (21,842 ) 90,642 (104,303 ) Cash Flows from Financing Activities: Repayment of revolving credit, term loan facilities and other debt (31,733 ) (1,495,558 ) (71 ) (1,154,986 ) — (2,682,348 ) Proceeds from revolving credit, term loan facilities and other debt 94,811 1,423,653 — 1,196,319 — 2,714,783 Debit balances (payments) under cash pools — 138,693 — 47,129 (185,822 ) — Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net — — — 10,668 — 10,668 Intercompany loans from parent — (9,305 ) (12,680 ) 96,457 (74,472 ) — Equity contribution from parent — — — 16,170 (16,170 ) — Parent cash dividends (2,060 ) — — — — (2,060 ) Net (payments) proceeds associated with employee stock-based awards (4,308 ) — — — — (4,308 ) Payment of debt financing and stock issuance costs — — (73 ) — — (73 ) Cash Flows from Financing Activities—Continuing Operations 56,710 57,483 (12,824 ) 211,757 (276,464 ) 36,662 Cash Flows from Financing Activities—Discontinued Operations — — — — — — Cash Flows from Financing Activities 56,710 57,483 (12,824 ) 211,757 (276,464 ) 36,662 Effect of exchange rates on cash and cash equivalents — — (455 ) 5,403 — 4,948 (Decrease) Increase in cash and cash equivalents (1,935 ) 41,170 (11,347 ) 217,078 (185,822 ) 59,144 Cash and cash equivalents, beginning of period 2,405 23,380 17,110 193,589 — 236,484 Cash and cash equivalents, end of period $ 470 $ 64,550 $ 5,763 $ 410,667 $ (185,822 ) $ 295,628 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued) Three Months Ended March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (66,516 ) $ 96,674 $ 61,410 $ — $ 91,568 Cash Flows from Operating Activities—Discontinued Operations — — — — — Cash Flows from Operating Activities (66,516 ) 96,674 61,410 — 91,568 Cash Flows from Investing Activities: Capital expenditures — (62,148 ) (33,457 ) — (95,605 ) Cash paid for acquisitions, net of cash acquired — (1,315,549 ) (113,425 ) — (1,428,974 ) Intercompany loans to subsidiaries 157,737 208,443 — (366,180 ) — Investment in subsidiaries — — — — — Acquisitions of customer relationships, customer inducements and data center lease-based intangibles — (11,874 ) (6,172 ) — (18,046 ) Proceeds from sales of property and equipment and other, net (including real estate) — (19,466 ) 79 — (19,387 ) Cash Flows from Investing Activities—Continuing Operations 157,737 (1,200,594 ) (152,975 ) (366,180 ) (1,562,012 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — Cash Flows from Investing Activities 157,737 (1,200,594 ) (152,975 ) (366,180 ) (1,562,012 ) Cash Flows from Financing Activities: Repayment of revolving credit, term loan facilities and other debt — (2,308,119 ) (2,102,537 ) — (4,410,656 ) Proceeds from revolving credit, term loan facilities and other debt — 3,067,988 2,428,503 — 5,496,491 Debit (payments) balances under cash pools — (51,946 ) (11,733 ) 63,679 — Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net — — (561 ) — (561 ) Intercompany loans from parent — (154,184 ) (211,996 ) 366,180 — Parent cash dividends (169,006 ) — — — (169,006 ) Net (payments) proceeds associated with employee stock-based awards (5,950 ) — — — (5,950 ) Net proceeds associated with the Over-Allotment Option exercise 76,192 — — — 76,192 Net proceeds associated with the At the Market (ATM) Program 8,716 — — — 8,716 Payment of debt financing and stock issuance costs (412 ) (9,075 ) (487 ) — (9,974 ) Cash Flows from Financing Activities—Continuing Operations (90,460 ) 544,664 101,189 429,859 985,252 Cash Flows from Financing Activities—Discontinued Operations — — — — — Cash Flows from Financing Activities (90,460 ) 544,664 101,189 429,859 985,252 Effect of exchange rates on cash and cash equivalents — — 1,984 — 1,984 Increase (Decrease) in cash and cash equivalents 761 (559,256 ) 11,608 63,679 (483,208 ) Cash and cash equivalents, beginning of period 2,433 634,317 383,675 (94,726 ) 925,699 Cash and cash equivalents, end of period $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Segment Information	Our six reportable operating segments as of December 31, 2017 are described in Note 9 to Notes to Consolidated Financial Statements included in our Annual Report and are as follows: • North American Records and Information Management Business • North American Data Management Business • Western European Business • Other International Business • Global Data Center Business • Corporate and Other Business There have been no changes made to our reportable operating segments since December 31, 2017. All previously reported segment information has been restated to conform to the current presentation and reflects the changes to our reportable operating segments that occurred in fourth quarter of 2017. The operations associated with acquisitions completed during the first three months of 2018 (which are described in Note 4) have been incorporated into our existing reportable operating segments. An analysis of our business segment information and reconciliation to the accompanying Condensed Consolidated Financial Statements is as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate Business Total As of and for the Three Months Ended March 31, 2017 Total Revenues $ 507,597 $ 100,834 $ 120,072 $ 189,241 $ 6,223 $ 14,909 $ 938,876 Storage Rental 298,183 68,824 71,567 117,615 5,858 10,232 572,279 Service 209,414 32,010 48,505 71,626 365 4,677 366,597 Depreciation and Amortization 60,535 8,251 14,297 27,676 1,424 12,524 124,707 Depreciation 51,952 6,063 10,888 19,305 1,360 10,024 99,592 Amortization 8,583 2,188 3,409 8,371 64 2,500 25,115 Adjusted EBITDA 209,530 55,270 34,142 55,347 1,506 (63,221 ) 292,574 Total Assets(1) 5,016,658 828,760 918,246 2,133,593 186,440 588,437 9,672,134 Expenditures for Segment Assets 51,888 7,906 5,025 18,620 8,895 14,458 106,792 Capital Expenditures 26,578 7,906 4,898 12,467 8,895 12,458 73,202 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 4,379 — — 5,808 — 2,000 12,187 Acquisitions of Customer Relationships and Customer Inducements 20,931 — 127 345 — — 21,403 As of and for the Three Months Ended March 31, 2018 Total Revenues 526,843 99,964 136,872 207,970 46,603 24,206 1,042,458 Storage Rental 304,819 69,246 83,952 131,747 45,495 15,890 651,149 Service 222,024 30,718 52,920 76,223 1,108 8,316 391,309 Depreciation and Amortization 62,752 10,104 17,770 31,659 22,268 16,025 160,578 Depreciation 49,138 8,023 12,905 18,917 11,380 13,069 113,432 Amortization 13,614 2,081 4,865 12,742 10,888 2,956 47,146 Adjusted EBITDA 225,738 53,852 44,082 60,631 20,790 (62,078 ) 343,015 Total Assets(1) 5,030,238 833,690 929,402 2,429,438 1,875,766 899,615 11,998,149 Expenditures for Segment Assets 43,181 6,853 7,584 32,056 1,438,012 14,939 1,542,625 Capital Expenditures 29,870 6,853 6,151 25,038 13,111 14,582 95,605 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 1,551 — — 3,208 1,424,215 — 1,428,974 Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs 11,760 — 1,433 3,810 686 357 18,046 ________________________________________________________ (1) Excludes all intercompany receivables or payables and investment in subsidiary balances. The accounting policies of the reportable segments are the same as those described in Note 2 and in our Annual Report. Adjusted EBITDA for each segment is defined as income (loss) from continuing operations before interest expense, net, provision (benefit) for income taxes, depreciation and amortization, and also excludes certain items that we believe are not indicative of our core operating results, specifically: (i) (gain) loss on disposal/write-down of property, plant and equipment (excluding real estate), net; (ii) intangible impairments; (iii) other (income) expense, net; (iv) gain on sale of real estate, net of tax; and (v) Significant Acquisition Costs (as defined below). Internally, we use Adjusted EBITDA as the basis for evaluating the performance of, and allocating resources to, our operating segments. A reconciliation of Adjusted EBITDA to income (loss) from continuing operations on a consolidated basis is as follows: Three Months Ended 2017 2018 Adjusted EBITDA $ 292,574 $ 343,015 (Add)/Deduct: Provision (Benefit) for Income Taxes 9,220 1,168 Other (Income) Expense, Net (6,364 ) 20,151 Interest Expense, Net 86,055 97,626 (Gain) loss on disposal/write-down of property, plant and equipment (excluding real estate), net (459 ) (1,130 ) Depreciation and Amortization 124,707 160,578 Significant Acquisition Costs(1) 20,571 19,008 Income (Loss) from Continuing Operations $ 58,844 $ 45,614 _______________________________________________________________________________ (1) Represents operating expenditures associated with (1) the Recall Transaction (as defined in Note 1 in Notes to Consolidated Financial Statements included in our Annual Report), including: (i) advisory and professional fees to complete the Recall Transaction; (ii) costs associated with the Divestments (as defined in Note 10) required in connection with receipt of regulatory approvals (including transitional services); and (iii) costs to integrate Recall Holdings Limited ("Recall") with our existing operations, including moving, severance, facility upgrade, REIT conversion and system upgrade costs, as well as certain costs associated with our shared service center initiative for our finance, human resources and information technology functions; and (2) the advisory and professional fees to complete the IODC Transaction (collectively, "Significant Acquisition Costs").

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2018
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	a. Litigation—General We are involved in litigation from time to time in the ordinary course of business. A portion of the defense and/or settlement costs associated with such litigation is covered by various commercial liability insurance policies purchased by us and, in limited cases, indemnification from third parties. Our policy is to establish reserves for loss contingencies when the losses are both probable and reasonably able to be estimated. We record legal costs associated with loss contingencies as expenses in the period in which they are incurred. The matters described below represent our significant loss contingencies. We have evaluated each matter and, if both probable and reasonably able to be estimated, accrued an amount that represents our estimate of any probable loss associated with such matter. In addition, we have estimated a reasonably possible range for all loss contingencies including those described below. We believe it is reasonably possible that we could incur aggregate losses in addition to amounts currently accrued for all matters up to an additional $21,500 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangements. b. Italy Fire On November 4, 2011, we experienced a fire at a facility we leased in Aprilia, Italy. The facility primarily stored archival and inactive business records for local area businesses. Despite quick response by local fire authorities, damage to the building was extensive, and the building and its contents were a total loss. We have been sued by six customers. Four of those lawsuits have been settled and two remain pending, including a claim asserted by Azienda per i Transporti Autoferrotranviari del Comune di Roma, S.p.A, seeking 42,600 Euros for the loss of its current and historical archives. We have also received correspondence from other affected customers, including certain customers demanding payment under various theories of liability. Although our warehouse legal liability insurer has reserved its rights to contest coverage related to certain types of potential claims, we believe we carry adequate insurance. We deny any liability with respect to the fire and we have referred these claims to our warehouse legal liability insurer for an appropriate response. We do not expect that this event will have a material impact on our consolidated financial condition, results of operations or cash flows. We sold our Italian operations on April 27, 2012, and we indemnified the buyers related to certain obligations and contingencies associated with the fire. As a result of the sale of the Italian operations, any future statement of operations and cash flow impacts related to the fire will be reflected as discontinued operations. c. Argentina Fire On February 5, 2014, we experienced a fire at a facility we own in Buenos Aires, Argentina. As a result of the quick response by local fire authorities, the fire was contained before the entire facility was destroyed and all employees were safely evacuated; however, a number of first responders lost their lives, or in some cases, were severely injured. The cause of the fire is currently being investigated. We believe we carry adequate insurance and do not expect that this event will have a material impact to our consolidated financial condition, results of operations or cash flows. Revenues from our operations at this facility represent less than 0.5% of our consolidated revenues. d. Brooklyn Fire (Recall) On January 31, 2015, a former Recall leased facility located in Brooklyn, New York was completely destroyed by a fire. Approximately 900,000 cartons of customer records were lost impacting approximately 1,200 customers. No one was injured as a result of the fire. We believe we carry adequate insurance to cover any losses resulting from the fire. There are two pending customer-related lawsuits stemming from the fire, which are being defended by our warehouse legal liability insurer. We have also received correspondence from other customers, under various theories of liability. We deny any liability with respect to the fire and we have referred these claims to our insurer for an appropriate response. We do not expect that this event will have a material impact on our consolidated financial condition, results of operations or cash flows. e. Roye Fire (Recall) On January 28, 2002, a former leased Recall records management facility located in Roye, France was destroyed by a fire. Local French authorities conducted an investigation relating to the fire and issued a charge of criminal negligence for non-compliance with security regulations against the Recall entity that leased the facility. We intend to defend this matter vigorously. We are currently corresponding with various customers impacted by the fire who are seeking payment under various theories of liability. There is also pending civil litigation with the owner of the destroyed facility, who is demanding payment for lost rental income and other items. Based on known and expected claims and our expectation of the ultimate outcome of those claims, we believe we carry adequate insurance coverage. We do not expect that this event will have a material impact on our consolidated financial condition, results of operations or cash flows. f. Puerto Rico Facility Damage In September 2017, two of our four facilities in Puerto Rico, one owned and one leased, sustained damage as a result of Hurricane Maria. The leased facility experienced structural damage to a portion of the roof and wall, while the owned facility sustained non-structural damage to a portion of the roof. Both buildings sustained water damage that impacted certain customer records and we are in the process of fully assessing the extent of the damage to our customers’ records at these facilities. We believe we carry adequate insurance coverage for this event and do not believe it will have a material impact to our consolidated financial condition, results of operations or cash flows. Revenues from our operations in Puerto Rico represent less than 0.5% of our consolidated revenues.

Stockholders' Equity Matters

Stockholders' Equity Matters	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Stockholders' Equity Matters	Our board of directors has adopted a dividend policy under which we have paid, and in the future intend to pay, quarterly cash dividends on our common stock. The amount and timing of future dividends will continue to be subject to the approval of our board of directors, in its sole discretion, and to applicable legal requirements. In fiscal year 2017 and in the first three months of 2018 , our board of directors declared the following dividends: Declaration Date Dividend Record Date Total Payment Date February 15, 2017 $ 0.5500 March 15, 2017 $ 145,235 April 3, 2017 May 24, 2017 0.5500 June 15, 2017 145,417 July 3, 2017 July 27, 2017 0.5500 September 15, 2017 146,772 October 2, 2017 October 24, 2017 0.5875 December 15, 2017 166,319 January 2, 2018 February 14, 2018 0.5875 March 15, 2018 167,969 April 2, 2018 At The Market (ATM) Equity Program In October 2017, we entered into a distribution agreement (the “Distribution Agreement”) with a syndicate of 10 banks (the “Agents”) pursuant to which we may sell, from time to time, up to an aggregate sales price of $500,000 of our common stock through the Agents (the “At The Market (ATM) Equity Program”). Sales of our common stock made pursuant to the Distribution Agreement may be made in negotiated transactions or transactions that are deemed to be “at the market” offerings as defined in Rule 415 under the Securities Act, including sales made directly on the New York Stock Exchange, or sales made to or through a market maker other than on an exchange, or as otherwise agreed between the applicable Agent and us. We intend to use the net proceeds from sales of our common stock pursuant to the At The Market (ATM) Equity Program for general corporate purposes, including financing the expansion of our data center business and adjacent businesses through acquisitions, and repaying amounts outstanding from time to time under the Revolving Credit Facility. During the quarter ended March 31, 2018 under the At The Market (ATM) Equity Program, we sold an aggregate of 273,486 shares of common stock for gross proceeds of approximately $8,800 , generating net proceeds of $8,716 , after deducting commissions of $90 . As of March 31, 2018 the remaining aggregate sale price of shares of our common stock available for distribution under the At The Market (ATM) Equity Program was approximately $431,200 . Equity Offering On December 12, 2017, we entered into an underwriting agreement (the "Underwriting Agreement") with a syndicate of 16 banks (the “Underwriters”) related to the public offering by us of 14,500,000 shares (the “Firm Shares”) of our common stock (the “Equity Offering”). The offering price to the public for the Equity Offering was $37.00 per share, and we agreed to pay the Underwriters an underwriting commission of $1.38195 per share. The net proceeds to us from the Equity Offering, after deducting underwriters' commissions, was $516,462 . At December 31, 2017, the net proceeds of the Equity Offering, together with the net proceeds from the 5 1 / 4 % Notes, were used to temporarily repay borrowings under our Revolving Credit Facility and invest in money market funds. Pursuant to the Underwriting Agreement, we granted the Underwriters a 30-day option to purchase from us up to an additional 2,175,000 shares of common stock (the “Option Shares”) at the public offering price, less the underwriting commission and less an amount per share equal to any dividends or distributions declared by us and payable on the Firm Shares but not payable on the Option Shares (the “Over-Allotment Option"). On January 10, 2018, the Underwriters exercised the Over-Allotment Option in its entirety. The net proceeds to us from the exercise of the Over-Allotment Option, after deducting underwriters' commissions and the per share value of the dividend we declared on our common stock on October 24, 2017 (for which the record date was December 15, 2017) which was paid on January 2, 2018, was approximately $76,200 . The net proceeds of the Equity Offering and the Over-Allotment Option, together with the net proceeds from the issuance of the 5 1 / 4 % Notes, were used to finance the purchase price of the IODC Transaction, and to pay related fees and expenses.

Divestments

Divestments	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Divestments	The table below summarizes certain results of operations of the Recall Divestments (as defined in Note 14 to Notes to Consolidated Financial Statements included in our Annual Report) included in discontinued operations for the three months ended March 31, 2017 and 2018: Three Months Ended March 31, Description 2017 2018 (Loss) Income from Discontinued Operations Before (Benefit) Provision for Income Taxes $ (429 ) $ (496 ) (Benefit) Provision for Income Taxes (92 ) (34 ) (Loss) Income from Discontinued Operations, Net of Tax $ (337 ) $ (462 )

Significant Acquisition Costs

Significant Acquisition Costs	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Recall Costs	We currently estimate total acquisition and integration expenditures associated with the Recall Transaction and acquisition expenditures associated with the IODC Transaction to be approximately $395,000 , the majority of which is related to the Recall Transaction. From January 1, 2015 through March 31, 2018 , we have incurred cumulative operating and capital expenditures associated with the Recall Transaction and the IODC Transaction of $334,648 , including $282,867 of Significant Acquisition Costs and $51,781 of capital expenditures. Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations are as follows: Three Months Ended 2017 2018 Cost of sales (excluding depreciation and amortization) $ 7,887 $ 296 Selling, general and administrative expenses 12,684 18,712 Total Significant Acquisition Costs $ 20,571 $ 19,008 Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations by segment are as follows: Three Months Ended 2017 2018 North American Records and Information Management Business $ 7,299 $ 584 North American Data Management Business 745 — Western European Business 3,216 2,152 Other International Business 1,651 537 Global Data Center Business — 10,181 Corporate and Other Business 7,660 5,554 Total Significant Acquisition Costs $ 20,571 $ 19,008 A rollforward of accrued liabilities related to Significant Acquisition Costs on our Condensed Consolidated Balance Sheets as of December 31, 2017 to March 31, 2018 is as follows: Accrual for Significant Acquisition Costs Balance at December 31, 2017 $ 12,622 Amounts accrued 1,038 Change in estimates(1) — Payments (5,867 ) Currency translation adjustments 85 Balance at March 31, 2018(2) $ 7,878 _______________________________________________________________________________ (1) Includes adjustments made to amounts accrued in a prior period. (2) Accrued liabilities related to Significant Acquisition Costs as of March 31, 2018 presented in the table above generally related to employee severance costs and onerous lease liabilities associated with the Recall Transaction. We expect that the majority of these liabilities will be paid throughout 2018. Additional Significant Acquisition Costs recorded in our Condensed Consolidated Statement of Operations for the three months ended March 31, 2018 have either been settled in cash during the three months ended March 31, 2018 or are included in our Condensed Consolidated Balance Sheet as of March 31, 2018 as a component of accounts payable.

Summary of Significant Accoun21

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Revenue Recognition, Policy [Policy Text Block]	Revenues In May 2014, the Financial Accounting Standards Board ("FASB") issued ASU 2014-09. ASU 2014-09 provides guidance for management to reassess revenue recognition as it relates to: (1) transfer of control, (2) variable consideration, (3) allocation of transaction price based on relative standalone selling price, (4) licenses, (5) time value of money, and (6) contract costs. We adopted ASU 2014-09 as of January 1, 2018 using the modified retrospective method for all of our customer contracts, whereby the cumulative effect of applying ASU 2014-09 is recognized at the date of initial application. At January 1, 2018, we recognized the cumulative effect of initially applying ASU 2014-09 as an adjustment to the opening balance of (distributions in excess of earnings) earnings in excess of distributions, resulting in a decrease of $29,461 to stockholders' equity. The reduction of (distribution in excess of earnings) earnings in excess of distributions represents the net effect of (i) the write off of Free Move Costs, net (which were capitalized and amortized prior to the adoption of ASU 2014-09) based upon the net book value of the Free Move Costs as of December 31, 2017, (ii) the recognition of certain Contract Fulfillment Assets, specifically Intake Costs (each as defined below) and commission assets, (iii) the recognition of deferred revenue associated with Intake Costs billed to our customers (as discussed below), and (iv) the deferred income tax impact of the aforementioned items. As we adopted ASU 2014-09 on a modified retrospective basis, the comparative Condensed Consolidated Balance Sheet as of December 31, 2017, and the Condensed Consolidated Statement of Operations, the Condensed Consolidated Statement of Comprehensive Income (Loss), the Condensed Consolidated Statement of Equity and the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2017 have not been restated to reflect the adoption of ASU 2014-09 and reflect our revenue policies in place at that time, as disclosed in Note 2.l. to Notes to Consolidated Financial Statements included in our Annual Report. Storage rental and service revenues are recognized in the month the respective storage rental or service is provided, and customers are generally billed on a monthly basis on contractually agreed-upon terms. The performance obligation is a series of distinct services (as determined for purposes of ASU 2014-09, a “series”) that have the same pattern of transfer to the customer that is satisfied over time. For those contracts that qualify as a series, we have a right to consideration from the customer in an amount that corresponds directly with the value of the underlying performance obligation transferred to the customer to date. This concept is known as "right to invoice" and we are applying the "right to invoice" practical expedient to all revenues, with the exception of storage revenues in our data center business. For all of our businesses, with the exception of the storage component of our data center business, each purchasing decision is fully in the control of the customer and, therefore, consideration beyond the current reporting period is variable and allocated to the specific period, which is consistent with the practical expedient above. Our data center business features storage rental provided to the customer at contractually specified rates over a fixed contractual period. The storage rental revenue related to the storage component of our data center business is recognized on a straight-line basis over the contract term. The revenue related to the service component of our data center business is recognized in the period the data center access or related services are provided. Total data center revenues represent less than 5% of our total consolidated revenues at March 31, 2018. The costs associated with the initial movement of customer records into physical storage and certain commissions are considered costs to obtain or fulfill customer contracts (“Contract Fulfillment Costs”). The following describes each of these Contract Fulfillment Costs recognized under ASC 2014-09: Intake Costs (and associated deferred revenue) Prior to the adoption of ASU 2014-09, intake costs incurred but not charged to a customer to transport records to our facilities (or Free Move Costs, as described in Note 2.c.), which include labor and transportation costs, were capitalized and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations. The initial movement of customer records into physical storage must take place prior to initiation of the storage of records and is not considered a separate performance obligation and, therefore, the costs of the initial intake of customer records into physical storage (“Intake Costs”) represent a contract fulfillment cost for the storage of records as the earnings process does not commence until a customer’s records or other assets are in our possession. Accordingly, upon the adoption of ASU 2014-09, all Intake Costs, regardless of whether or not the services associated with such initial moves are billed to the customer or are provided to the customer at no charge, will be deferred and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. Similarly, in instances where such Intake Costs are billed to the customer, the associated revenue will be deferred and recognized over the same three year period. Commissions Prior to the adoption of ASU 2014-09, commissions we paid related to our long-term storage contracts were expensed as incurred. Upon the adoption of ASU 2014-09, certain commission payments that are directly associated with the fulfillment of long-term storage contracts are capitalized and amortized as a component of depreciation and amortization in our Consolidated Statements of Operations over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. Certain direct commission payments associated with contracts with a duration of one year or less are expensed as incurred under the practical expedient which allows an entity to expense as incurred an incremental cost of obtaining a contract if the amortization period of the asset that the entity otherwise would have recognized is one year or less.
Foreign Currency	Foreign Currency Local currencies are the functional currencies for our operations outside the United States, with the exception of certain foreign holding companies and our financing centers in Europe, whose functional currency is the United States dollar. In those instances where the local currency is the functional currency, assets and liabilities are translated at period-end exchange rates, and revenues and expenses are translated at average exchange rates for the applicable period. Resulting translation adjustments are reflected in the accumulated other comprehensive items, net component of Iron Mountain Incorporated Stockholders' Equity. The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, including those related to (i) borrowings in certain foreign currencies under our Former Revolving Credit Facility and Revolving Credit Facility (both as defined and discussed more fully in Note 5), (ii) our Euro Notes (as defined and discussed more fully in Note 5), and (iii) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested, are included in Other (income) expense, net, in the accompanying Condensed Consolidated Statements of Operations.
Goodwill and Other Intangible Assets	Goodwill Goodwill is not amortized but is reviewed annually for impairment, or more frequently if impairment indicators arise. We have selected October 1 as our annual goodwill impairment review date. Finite-lived intangible assets and liabilities i. Customer Relationship Intangible Assets Customer relationship intangible assets, which are acquired through either business combinations or acquisitions of customer relationships, are amortized over periods ranging from 10 to 30 years and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. The value of customer relationship intangible assets is calculated based upon estimates of their fair value utilizing an income approach based on the present value of expected future cash flows. ii. Customer Inducements Prior to the adoption of ASU 2014-09, free intake costs to transport boxes to one of our facilities, which include labor and transportation costs ("Free Move Costs"), were capitalized and amortized over periods ranging from 10 to 30 years. The amortization of Free Move Costs is included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations for the three months ended March 31, 2017. Subsequent to the adoption of ASU 2014-09, Free Move Costs are considered a Contract Fulfillment Cost (as defined in Note 2.d.) and, therefore, are now deferred and amortized over three years, consistent with the transfer of the performance obligation to the customer to which the asset relates. See Note 2.d. for information regarding the accounting for Free Move Costs, which are now a component of Intake Costs (as defined in Note 2.d.), following the adoption of ASU 2014-09. Payments that are made to a customer's current records management vendor in order to terminate the customer's existing contract with that vendor, or direct payments to a customer ("Permanent Withdrawal Fees"), are amortized over periods ranging from 5 to 15 years and are included in storage and service revenue in the accompanying Condensed Consolidated Statements of Operations. Our accounting for Permanent Withdrawl Fees did not change as a result of the adoption of ASU 2014-09. Free Move Costs (prior to the adoption of ASU 2014-09) and Permanent Withdrawal Fees are collectively referred to as "Customer Inducements". If the customer terminates its relationship with us, the unamortized carrying value of the Customer Inducement intangible asset is charged to expense or revenue. However, in the event of such termination, we generally collect, and record as income, permanent removal fees that generally equal or exceed the amount of the unamortized Customer Inducement intangible asset. iii. Data Center Intangible Assets and Liabilities Finite-lived intangible assets associated with our data center business consist of the following: Data Center In-Place Lease Intangible Assets and Data Center Tenant Relationship Intangible Assets Data Center In-Place Lease Intangible Assets (“Data Center In-Place Leases”) and Data Center Tenant Relationship Intangible Assets (“Data Center Tenant Relationships") are acquired through either business combinations or asset acquisitions in our data center business. These intangible assets reflect the value associated with acquiring a data center operation with active tenants as of the date of acquisition. The value of Data Center In-Place Leases is determined based upon an estimate of the economic costs (such as lost revenues and unreimbursed operating expenses during the lease-up period, tenant improvement costs, commissions, legal expenses and other costs to acquire new data center leases) avoided by acquiring a data center operation with active tenants that would have otherwise been incurred if the data center operation was purchased vacant. Data Center In-Place Leases are amortized over the weighted average remaining term of the acquired data center leases and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. The value of Data Center Tenant Relationships is determined based upon an estimate of the economic costs avoided upon lease renewal of the acquired tenants, based upon expectations of lease renewal. Data Center Tenant Relationships are amortized over the weighted average remaining anticipated life of the relationship with the acquired tenant and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations. Data Center In-Place Leases and Data Center Tenant Relationships are included in Customer relationships, customer inducements and data center lease-based intangibles in the accompanying Condensed Consolidated Balance Sheets. Data Center Above-Market and Below-Market In-Place Lease Intangible Assets Data Center Above-Market In-Place Lease Intangible Assets (“Data Center Above-Market Leases”) and Data Center Below-Market In-Place Lease Intangible Assets (“Data Center Below-Market Leases”) are acquired through either business combinations or asset acquisitions in our data center business. We record Data Center Above-Market Leases and Data Center Below-Market Leases at the net present value of the difference between (i) the contractual amounts to be paid pursuant to each in-place lease and (ii) management’s estimate of the fair market lease rates for each corresponding in-place lease. Data Center Above-Market Leases and Data Center Below-Market Leases are amortized over the remaining non-cancellable term of the acquired in-place lease to storage revenue in the accompanying Condensed Consolidated Statements of Operations. Data Center Above-Market Leases are included in Customer relationships, customer inducements and data center lease-based intangibles in the accompanying Condensed Consolidated Balance Sheets. Data Center Below-Market Leases are included in Other long-term liabilities in the accompanying Condensed Consolidated Balance Sheets.
Stock-Based Compensation	Stock-Based Compensation We record stock-based compensation expense, utilizing the straight-line method, for the cost of stock options, restricted stock units ("RSUs"), performance units ("PUs") and shares of stock issued under our employee stock purchase plan ("ESPP") (together, "Employee Stock-Based Awards"). Under our various equity compensation plans, we may also grant RSUs. Our RSUs generally have a vesting period of three years from the date of grant. However, RSUs granted to our non-employee directors vest immediately upon grant. All RSUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of RSUs in cash upon the vesting date of the associated RSU and will be forfeited if the RSU does not vest. The fair value of RSUs is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero). We offer an ESPP in which participation is available to substantially all of our employees employed in the United States and Canada who meet certain service eligibility requirements. The price for shares purchased under the ESPP is 95% of the market price of our common stock at the end of the offering period, without a look-back feature. As a result, we do not recognize compensation expense for the ESPP shares purchased. Under our various equity compensation plans, we may also make awards of PUs. For the majority of outstanding PUs, the number of PUs earned is determined based on our performance against predefined targets of revenue and return on invested capital ("ROIC") and, beginning with PUs granted in 2018, Adjusted EBITDA (as defined in Note 7). The number of PUs earned may range from 0% to 200% of the initial award. The number of PUs earned is determined based on our actual performance as compared to the targets at the end of a three -year performance period. Certain PUs that we grant will be earned based on a market condition associated with the total return on our common stock in relation to either (i) a subset of the Standard & Poor's 500 Index (for certain PUs granted prior to 2017), or (ii) the MSCI United States REIT Index (for certain PUs granted in 2017 and thereafter), rather than the revenue, ROIC and Adjusted EBITDA targets noted above. The number of PUs earned based on the applicable market condition may range from 0% to 200% of the initial award. All of our PUs will be settled in shares of our common stock and are subject to cliff vesting three years from the date of the original PU grant. PUs awarded to employees who terminate their employment during the three -year performance period and on or after attaining age 55 and completing 10 years of qualifying service are eligible for pro-rated vesting, subject to the actual achievement against the predefined targets or a market condition as discussed above, based on the number of full years of service completed following the grant date (but delivery of the shares remains deferred). As a result, PUs are generally expensed over the three-year performance period. All PUs accrue dividend equivalents associated with the underlying stock as we declare dividends. Dividends will generally be paid to holders of PUs in cash upon the settlement date of the associated PU and will be forfeited if the PU does not vest. The majority of our PUs are earned based on our performance against revenue, ROIC and, beginning with PUs granted in 2018, Adjusted EBITDA targets during their applicable performance period; therefore, we forecast the likelihood of achieving the predefined revenue, ROIC and Adjusted EBITDA targets in order to calculate the expected PUs to be earned. We record a compensation charge based on either the forecasted PUs to be earned (during the performance period) or the actual PUs earned (at the three-year anniversary of the grant date) over the vesting period for each of the awards. The fair value of PUs based on our performance against revenue, ROIC and Adjusted EBITDA targets is the excess of the market price of our common stock at the date of grant over the purchase price (which is typically zero). For PUs earned based on a market condition, we utilize a Monte Carlo simulation to fair value these awards at the date of grant, and such fair value is expensed over the three-year performance period.
Income (Loss) Per Share-Basic and Diluted	Income (Loss) Per Share—Basic and Diluted Basic income (loss) per common share is calculated by dividing income (loss) by the weighted average number of common shares outstanding. The calculation of diluted income (loss) per share is consistent with that of basic income (loss) per share but gives effect to all potential common shares (that is, securities such as stock options, RSUs or PUs) that were outstanding during the period, unless the effect is antidilutive.
Income Taxes	We provide for income taxes during interim periods based on our estimate of the effective tax rate for the year. Our estimate of the effective tax rate for the year ending December 31, 2018 reflects the impact of the Tax Reform Legislation (as defined below). Discrete items and changes in our estimate of the annual effective tax rate are recorded in the period they occur. Our effective tax rate is subject to variability in the future due to, among other items: (1) changes in the mix of income between our qualified REIT subsidiaries ("QRSs") and our domestic taxable REIT subsidiaries ("TRSs"), as well as among the jurisdictions in which we operate; (2) tax law changes; (3) volatility in foreign exchange gains and losses; (4) the timing of the establishment and reversal of tax reserves; and (5) our ability to utilize net operating losses that we generate.
Fair Value Measurements	Fair Value Measurements Our financial assets or liabilities that are carried at fair value are required to be measured using inputs from the three levels of the fair value hierarchy. A financial asset or liability's classification within the hierarchy is determined based on the lowest level input that is significant to the fair value measurement. The three levels of the fair value hierarchy are as follows: Level 1—Inputs are unadjusted quoted prices in active markets for identical assets or liabilities that we have the ability to access at the measurement date. Level 2—Inputs include quoted prices for similar assets and liabilities in active markets, quoted prices for identical or similar assets or liabilities in markets that are not active, inputs other than quoted prices that are observable for the asset or liability (i.e., interest rates, yield curves, etc.), and inputs that are derived principally from or corroborated by observable market data by correlation or other means (market corroborated inputs). Level 3—Unobservable inputs that reflect our assumptions about the assumptions that market participants would use in pricing the asset or liability.
New Accounting Pronouncements	New Accounting Pronouncements Recently Adopted Accounting Pronouncements In May 2014, the FASB issued ASU 2014-09. We adopted ASU 2014-09 on January 1, 2018 using the modified retrospective method. See Note 2.d. for information regarding the impact of the adoption of ASU 2014-09 on our consolidated financial statements. In January 2016, the FASB issued ASU No. 2016-01, Financial Instruments - Overall (Subtopic 825-10): Recognition and Measurement of Financial Assets and Financial Liabilities ("ASU 2016-01"). ASU 2016-01 requires that most equity investments be measured at fair value, with subsequent changes in fair value recognized in net income, while eliminating the available-for-sale classification for equity securities with readily determinable fair values and the cost method for equity investments without readily determinable fair values. ASU 2016-01 also impacts financial liabilities under the fair value option and the presentation and disclosure requirements for financial instruments. We adopted ASU 2016-01 on January 1, 2018. ASU 2016-01 did not have an impact on our consolidated financial statements. In August 2017, the FASB issued ASU No. 2017-12, Derivatives and Hedging (Topic 815): Targeted Improvements to Accounting for Hedging Activities ("ASU 2017-12"). ASU 2017-12 amends the hedge accounting recognition and presentation requirements as outlined in Accounting Standards Codification Topic 815 with the objective of improving the financial reporting of hedging relationships to better portray the economic results of an entity’s risk management activities in its financial statements and enhance the transparency and understandability of hedge transactions. In addition, ASU 2017-12 simplifies the application of the hedge accounting guidance. We adopted ASU 2017-12 on January 1, 2018. ASU 2017-12 did not have a material impact on our consolidated financial statements. Other As Yet Adopted Accounting Pronouncements In February 2016, the FASB issued ASU No. 2016-02, Leases (Topic 842) ("ASU 2016-02"). ASU 2016-02 requires lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by all leases with terms of more than 12 months. ASU 2016-02 also will require certain qualitative and quantitative disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. ASU 2016-02 will be effective for us on January 1, 2019, with early adoption permitted. We are in the process of establishing a cross-functional project team responsible for the assessment and implementation of ASU 2016-02. We are also in the process of identifying and evaluating the technology options available to update our lease accounting processes and systems in anticipation of our future adoption of ASU 2016-02. We are currently evaluating the impact ASU 2016-02 will have on our consolidated financial statements.

Summary of Significant Accoun22

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2018
Accounting Policies [Abstract]
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	The following table presents certain components of our Condensed Consolidated Statements of Operations as of March 31, 2018 as reported and if we had not adopted ASU 2014-09 on January 1, 2018: Three Months Ended March 31, 2018 (As Reported) Three Months Ended Revenues $ 1,042,458 $ 1,041,264 Operating Income $ 164,559 $ 165,319 Income from Continuing Operations $ 45,614 $ 46,374 Per Share Income from Continuing Operations - Basic $ 0.16 $ 0.16 Per Share Income from Continuing Operations - Diluted $ 0.16 $ 0.16 The Contract Fulfillment Assets recorded as a result of the adoption of ASU 2014-09 as of January 1, 2018 and March 31, 2018 are as follows: January 1, 2018 (Date of Adoption of ASU 2014-09) March 31, 2018 Description Location in Balance Sheet Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Commissions asset Other (within Other Assets, Net) $ 42,072 $ (21,173 ) $ 20,899 $ 44,729 $ (24,781 ) $ 19,948 Intake Costs asset Other (within Other Assets, Net) 31,604 (14,954 ) 16,650 34,408 (17,875 ) 16,533 Deferred revenue liabilities, associated with billed Intake Costs, recorded as a result of the adoption of ASU 2014-09 as of January 1, 2018 and March 31, 2018 are as follows: Description Location in Balance Sheet January 1, 2018 (Date of Adoption of ASU 2014-09) March 31, 2018 Deferred revenue - Current Deferred revenue $ 9,953 $ 10,482 Deferred revenue - Long-term Other Long-term Liabilities 9,453 9,639
Schedule of foreign currency gain/loss	Total (gain) loss on foreign currency transactions for the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Total (gain) loss on foreign currency transactions $ (4,164 ) $ 21,785
Schedule of changes in the carrying value of goodwill attributable to each reportable operating segment	The changes in the carrying value of goodwill attributable to each reportable operating segment for the three months ended March 31, 2018 are as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate and Other Business Total Gross Balance as of December 31, 2017 $ 2,474,829 $ 551,726 $ 453,537 $ 846,721 $ — $ 60,048 $ 4,386,861 Non-deductible goodwill acquired during the year — — — — 229,539 — 229,539 Fair value and other adjustments(1) 122 — — 5,886 — 4,704 10,712 Currency effects (5,593 ) (1,528 ) 13,885 7,713 — 621 15,098 Gross Balance as of March 31, 2018 $ 2,469,358 $ 550,198 $ 467,422 $ 860,320 $ 229,539 $ 65,373 $ 4,642,210 Accumulated Amortization Balance as of December 31, 2017 $ 205,383 $ 53,875 $ 57,048 $ 288 $ — $ — $ 316,594 Currency effects (198 ) (50 ) 376 10 — — 138 Accumulated Amortization Balance as of March 31, 2018 $ 205,185 $ 53,825 $ 57,424 $ 298 $ — $ — $ 316,732 Net Balance as of December 31, 2017 $ 2,269,446 $ 497,851 $ 396,489 $ 846,433 $ — $ 60,048 $ 4,070,267 Net Balance as of March 31, 2018 $ 2,264,173 $ 496,373 $ 409,998 $ 860,022 $ 229,539 $ 65,373 $ 4,325,478 Accumulated Goodwill Impairment Balance as of December 31, 2017 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 Accumulated Goodwill Impairment Balance as of March 31, 2018 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 _______________________________________________________________________________ (1) Total fair value and other adjustments include $10,712 in net adjustments primarily related to property, plant and equipment, customer relationship intangible assets and deferred income taxes and other liabilities
Components of amortizable intangible assets	The other finite-lived intangible assets as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Other finite-lived intangible assets (included in other assets, net) $ 20,929 $ (10,728 ) $ 10,201 $ 20,974 $ (11,936 ) $ 9,038 The components of our finite-lived intangible assets related to customer relationship value, customer inducements and data center lease-based intangible assets and liabilities as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Assets: Customer relationship intangible assets $ 1,704,105 $ (395,278 ) $ 1,308,827 $ 1,728,685 $ (427,550 ) $ 1,301,135 Customer inducements(1) 140,030 (66,981 ) 73,049 57,502 (35,149 ) 22,353 Data center lease-based intangible assets(2) 19,314 (643 ) 18,671 282,609 (13,609 ) 269,000 $ 1,863,449 $ (462,902 ) $ 1,400,547 $ 2,068,796 $ (476,308 ) $ 1,592,488 Liabilities: Data center below-market leases $ — $ — $ — $ 11,421 $ (349 ) $ 11,072 _______________________________________________________________________________ (1) The gross carrying amount, accumulated amortization and net carrying amount of customer inducements as of December 31, 2017 includes Free Move Costs, which were capitalized as Customer Inducements prior to the adoption of ASU 2014-09. Subsequent to the adoption of ASU 2014-09, Free Move Costs are considered a Contract Fulfillment Cost. Contract Fulfillment Costs are included in Other, a component of Other Assets, Net, in the accompanying Condensed Consolidated Balance Sheet as of March 31, 2018. See Note 2.d. for information regarding Contract Fulfillment Costs included in our Condensed Consolidated Balance Sheet as of March 31, 2018. (2) Includes Data Center In-Place Leases, Data Center Tenant Relationships and Data Center Above-Market Leases.
Schedule of amortization expenses	Three Months Ended 2017 2018 Amortization expense included in depreciation and amortization associated with: Customer relationship intangible assets $ 20,133 $ 26,337 Customer inducements 2,666 2,469 Data center in-place leases and tenant relationships — 10,838 Other finite-lived intangible assets 2,316 1,185 Revenue reduction associated with amortization of: Permanent withdrawal fees $ 3,158 $ 2,585 Data center above-market leases and data center below-market leases — 1,079
Stock-based compensation expense for Employee Stock-Based Awards related to continuing operations	Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Condensed Consolidated Statements of Operations is as follows: Three Months Ended 2017 2018 Cost of sales (excluding depreciation and amortization) $ 28 $ 29 Selling, general and administrative expenses 6,521 7,355 Total stock-based compensation $ 6,549 $ 7,384
Summary of stock option activity	A summary of our stock options outstanding as of March 31, 2018 by vesting terms is as follows: March 31, 2018 Stock Options Outstanding % of Stock Options Outstanding Three-year vesting period (10 year contractual life) 4,111,684 91.8 % Five-year vesting period (10 year contractual life) 366,855 8.2 % 4,478,539 100.0 % A summary of stock option activity for the three months ended March 31, 2018 is as follows: Stock Options Weighted Weighted Average Outstanding at December 31, 2017 3,671,740 $ 34.41 Granted 839,437 33.72 Exercised (20,223 ) 19.41 Forfeited (9,673 ) 35.12 Expired (2,742 ) 37.71 Outstanding at March 31, 2018 4,478,539 $ 34.34 7.58 $ 8,201 Options exercisable at March 31, 2018 2,498,039 $ 33.73 6.39 $ 7,815 Options expected to vest 1,831,809 $ 35.12 9.08 $ 367
Summary of the weighted average assumptions used for stock option grants	The weighted average assumptions used for grants in the respective periods are as follows: Three Months Ended Weighted Average Assumptions 2017 2018 Expected volatility 25.8 % 25.4 % Risk-free interest rate 1.96 % 2.65 % Expected dividend yield 6 % 7 % Expected life 5.0 years 5.0 years
Aggregate intrinsic value of stock options exercised	The aggregate intrinsic value of stock options exercised for the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Aggregate intrinsic value of stock options exercised $ 1,912 $ 393
Summary of restricted stock and RSU activity	Cash dividends accrued and paid on RSUs for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended 2017 2018 Cash dividends accrued on RSUs $ 683 $ 721 Cash dividends paid on RSUs 1,855 2,043 The fair value of RSUs vested during the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Fair value of RSUs vested $ 14,026 $ 15,330 A summary of RSU activity for the three months ended March 31, 2018 is as follows: RSUs Weighted- Non-vested at December 31, 2017 1,071,469 $ 35.38 Granted 611,030 33.58 Vested (436,489 ) 35.12 Forfeited (24,035 ) 36.43 Non-vested at March 31, 2018 1,221,975 $ 34.55
Schedule of performance units	Cash dividends accrued and paid on PUs for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended 2017 2018 Cash dividends accrued on PUs $ 324 $ 450 Cash dividends paid on PUs 205 644 The fair value of earned PUs that vested during the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Fair value of earned PUs that vested $ 905 $ 3,033
Summary of Performance Unit (PU) activity	A summary of PU activity for the three months ended March 31, 2018 is as follows: Original PU Adjustment(1) Total Weighted- Non-vested at December 31, 2017 717,878 (250,067 ) 467,811 $ 39.28 Granted 347,576 — 347,576 33.64 Vested (79,121 ) — (79,121 ) 38.34 Forfeited/Performance or Market Conditions Not Achieved (2,626 ) (49,881 ) (52,507 ) 38.28 Non-vested at March 31, 2018 983,707 (299,948 ) 683,759 $ 36.60 _______________________________________________________________________________ (1) Represents an increase or decrease in the number of original PUs awarded based on either the final performance criteria or market condition achievement at the end of the performance period of such PUs or a change in estimated awards based on the forecasted performance against the predefined targets.
Calculation of basic and diluted net income (loss) per share attributable to the entity	The calculation of basic and diluted income (loss) per share for the three months ended March 31, 2017 and 2018 is as follows: Three Months Ended 2017 2018 Income (loss) from continuing operations $ 58,844 $ 45,614 Less: Net income (loss) attributable to noncontrolling interests 382 468 Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) $ 58,462 $ 45,146 (Loss) income from discontinued operations, net of tax $ (337 ) $ (462 ) Net income (loss) attributable to Iron Mountain Incorporated $ 58,125 $ 44,684 Weighted-average shares—basic 263,855,000 285,259,000 Effect of dilutive potential stock options 461,761 249,564 Effect of dilutive potential RSUs and PUs 492,905 484,314 Weighted-average shares—diluted 264,809,666 285,992,878 Earnings (losses) per share—basic: Income (loss) from continuing operations $ 0.22 $ 0.16 Income (loss) from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.22 $ 0.16 Earnings (losses) per share—diluted: Income (loss) from continuing operations $ 0.22 $ 0.16 Income (loss) from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.22 $ 0.16 Antidilutive stock options, RSUs and PUs, excluded from the calculation 2,494,255 3,242,141 _______________________________________________________________________________ (1) Columns may not foot due to rounding.
Assets and liabilities carried at fair value measured on a recurring basis	The assets and liabilities carried at fair value measured on a recurring basis as of December 31, 2017 and March 31, 2018 , respectively, are as follows: Fair Value Measurements at Description Total Carrying Value at December 31, 2017 Quoted prices in active markets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Money Market Funds(1) $ 585,000 $ — $ 585,000 $ — Time Deposits(1) 24,482 — 24,482 — Trading Securities 11,784 11,279 (2) 505 (3) — Derivative Assets(4) 1,579 — 1,579 — Derivative Liabilities(4) 2,329 — 2,329 — Fair Value Measurements at Description Total Carrying Value at March 31, 2018 Quoted prices in active markets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Time Deposits(1) $ 16,678 $ — $ 16,678 $ — Trading Securities 11,129 10,739 (2) 390 (3) — Derivative Liabilities(4) 1,102 — 1,102 — Interest Rate Swap Agreements(5) 185 — 185 — _______________________________________________________________________________ (1) Money market funds and time deposits are measured based on quoted prices for similar assets and/or subsequent transactions. (2) Certain trading securities are measured at fair value using quoted market prices. (3) Certain trading securities are measured based on inputs other than quoted market prices that are observable. (4) Derivative assets and liabilities relate to short-term (six months or less) foreign currency contracts that we have entered into to hedge certain of our foreign exchange intercompany exposures, as more fully disclosed at Note 3. We calculate the value of such forward contracts by adjusting the spot rate utilized at the balance sheet date for translation purposes by an estimate of the forward points observed in active markets. (5) We have entered into interest rate swap agreements to hedge certain of our interest rate exposures, as more fully disclosed in Note 3. The interest rate swap agreements are designated as cash flow hedges and are measured based on inputs other than quoted market prices that are observable.
Schedule of changes in accumulated other comprehensive items, net	The changes in accumulated other comprehensive items, net for the three months ended March 31, 2017 and 2018 , respectively, are as follows: Foreign Total Balance as of December 31, 2016 $ (212,573 ) $ (212,573 ) Other comprehensive income (loss): Foreign currency translation adjustments 51,334 51,334 Total other comprehensive income (loss) 51,334 51,334 Balance as of March 31, 2017 $ (161,239 ) $ (161,239 ) Foreign Fair Value Adjustments for Interest Rate Swap Agreements Total Balance as of December 31, 2017 $ (103,989 ) $ — $ (103,989 ) Other comprehensive income (loss): Foreign currency translation adjustments 30,092 — 30,092 Fair value adjustments for interest rate swap agreements — (185 ) (185 ) Total other comprehensive income (loss) 30,092 (185 ) 29,907 Balance as of March 31, 2018 $ (73,897 ) $ (185 ) $ (74,082 )
Other expense (income), net	Other (income) expense, net for the three months ended March 31, 2017 and 2018 consists of the following: Three Months Ended 2017 2018 Foreign currency transaction (gains) losses, net $ (4,164 ) $ 21,785 Other, net (2,200 ) (1,634 ) $ (6,364 ) $ 20,151

Derivative Instruments and He23

Derivative Instruments and Hedging Activities (Tables)	3 Months Ended
	Mar. 31, 2018
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Schedule of Derivative Instruments in Statement of Financial Position, Fair Value [Table Text Block]	Our policy is to record the fair value of each derivative instrument on a gross basis. The following table provides the fair value of our derivative instruments not designated as hedging instruments as of December 31, 2017 and March 31, 2018: Derivatives Not Designated as Hedging Instruments Balance Sheet Location December 31, 2017 March 31, 2018 Derivative assets Prepaid expenses and other $ 1,579 $ — Derivative liabilities Accrued expenses 2,329 1,102
Derivative Instruments, Gain (Loss) [Table Text Block]	(Gains) losses for our derivative instruments not recognized as hedging instruments for the three months ended March 31, 2017 and 2018 are as follows: Three Months Ended Derivatives Not Designated as Hedging Instruments Location of Loss (Gain) Recognized in Income on Derivative 2017 2018 Foreign exchange contracts Other (income) expense, net $ — $ (5,991 )
Foreign exchange gains related to currency translation adjustments	As a result, we recorded the following foreign exchange (losses) gains related to the change in fair value of such debt due to currency translation adjustments, which is a component of accumulated other comprehensive items, net: Three Months Ended 2017 2018 Foreign exchange (losses) gains $ (1,072 ) $ (5,635 )

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information	Three Months Ended March 31, 2017 2018 Total Revenues $ 973,757 $ 1,045,929 Income from Continuing Operations $ 17,431 $ 55,181 Per Share Income from Continuing Operations - Basic $ 0.06 $ 0.19 Per Share Income from Continuing Operations - Diluted $ 0.06 $ 0.19
Schedule of Recognized Identified Assets Acquired and Liabilities Assumed	A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our 2018 acquisitions through March 31, 2018 is as follows: IODC Transaction Other Fiscal Year 2018 Acquisitions (excluding IODC) Total Cash Paid (gross of cash acquired)(1) $ 1,347,046 $ 112,947 $ 1,459,993 Purchase price holdbacks — 149 149 Total Consideration 1,347,046 113,096 1,460,142 Fair Value of Identifiable Assets Acquired: Cash 34,227 — 34,227 Accounts Receivable and Prepaid Expenses 7,070 558 7,628 Property, Plant and Equipment(2) 863,027 111,267 974,294 Customer Relationship Intangible Assets — 1,593 1,593 Data Center In-Place Leases 128,513 9,492 138,005 Data Center Tenant Relationships 102,850 — 102,850 Data Center Above-Market Leases 16,439 — 16,439 Accounts Payable, Accrued Expenses and Other Liabilities (23,198 ) — (23,198 ) Deferred Income Taxes — (9,814 ) (9,814 ) Data Center Below-Market Leases (11,421 ) — (11,421 ) Total Fair Value of Identifiable Net Assets Acquired 1,117,507 1,117,507 113,096 1,230,603 Goodwill Initially Recorded(3) $ 229,539 $ — $ 229,539 _______________________________________________________________________________ (1) Included in cash paid for acquisitions in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2018 is net cash acquired of $34,227 and contingent and other payments, net of $3,208 related to acquisitions made in previous years. The cash paid for the Accrued Purchase Price for the Santa Fe China Transaction is included in cash flows from financing activities (as a component of repayment of revolving credit, term loan and bridge facilities and other debt) in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2018. (2) Consists primarily of building, building improvements, leasehold improvements, racking structures and warehouse equipment. These assets are depreciated using the straight-line method with the useful lives as noted in Note 2.f. to Notes to Consolidated Financial Statements included in our Annual Report. (3) The goodwill associated with acquisitions is primarily attributable to the assembled workforce, expanded market opportunities and costs and other operating synergies anticipated upon the integration of the operations of us and the acquired businesses.

Debt (Tables)

Debt (Tables)	3 Months Ended
	Mar. 31, 2018
Debt Disclosure [Abstract]
Schedule of carrying amount and fair value of long-term debt instruments	Long-term debt is as follows: December 31, 2017 March 31, 2018 Debt (inclusive of discount) Unamortized Deferred Financing Costs Carrying Amount Fair Debt (inclusive of discount) Unamortized Deferred Financing Costs Carrying Amount Fair Revolving Credit Facility $ 466,593 $ (14,407 ) $ 452,186 $ 466,593 $ 800,158 $ (13,688 ) $ 786,470 $ 800,158 Term Loan A 243,750 — 243,750 243,750 240,625 — 240,625 240,625 Term Loan B — — — — 698,250 (8,698 ) 689,552 700,000 Australian Dollar Term Loan (the "AUD Term Loan") 187,504 (3,382 ) 184,122 189,049 259,431 (3,761 ) 255,670 261,662 4 3 / 8 % Senior Notes due 2021 (the "4 3 / 8 % Notes")(1)(2) 500,000 (5,874 ) 494,126 507,500 500,000 (5,444 ) 494,556 501,250 6% Senior Notes due 2023 (the "6% Notes due 2023")(1) 600,000 (6,224 ) 593,776 625,500 600,000 (5,949 ) 594,051 618,000 5 3 / 8 % CAD Senior Notes due 2023 (the "CAD Notes due 2023")(2)(3) 199,171 (3,295 ) 195,876 208,631 193,826 (3,067 ) 190,759 196,482 5 3 / 4 % Senior Subordinated Notes due 2024 (the "5 3 / 4 % Notes")(1) 1,000,000 (9,156 ) 990,844 1,012,500 1,000,000 (8,812 ) 991,188 970,000 3% Euro Senior Notes due 2025 (the "Euro Notes")(1)(2) 359,386 (4,691 ) 354,695 364,776 369,711 (4,567 ) 365,144 366,014 3 7 / 8 % GBP Senior Notes due 2025 (the "GBP Notes due 2025")(2) 539,702 (7,718 ) 531,984 527,559 560,516 (7,758 ) 552,758 529,789 5 3 / 8 % Senior Notes due 2026 (the "5 3 / 8 % Notes")(2) 250,000 (3,615 ) 246,385 256,875 250,000 (3,508 ) 246,492 240,313 4 7 / 8 % Senior Notes due 2027 (the "4 7 / 8 % Notes")(1)(2) 1,000,000 (13,866 ) 986,134 1,000,000 1,000,000 (13,509 ) 986,491 927,500 5 1 / 4 % Senior Notes due 2028 (the "5 1 / 4 % Notes")(1)(2) 825,000 (11,817 ) 813,183 826,031 825,000 (11,817 ) 813,183 773,438 Real Estate Mortgages, Capital Leases and Other 649,432 (566 ) 648,866 649,432 630,868 (451 ) 630,417 630,868 Accounts Receivable Securitization Program 258,973 (356 ) 258,617 258,973 272,273 (321 ) 271,952 272,273 Mortgage Securitization Program 50,000 (1,273 ) 48,727 50,000 50,000 (1,237 ) 48,763 50,000 Total Long-term Debt 7,129,511 (86,240 ) 7,043,271 8,250,658 — (92,587 ) 8,158,071 Less Current Portion (146,300 ) — (146,300 ) (137,198 ) — (137,198 ) Long-term Debt, Net of Current Portion $ 6,983,211 $ (86,240 ) $ 6,896,971 $ 8,113,460 $ (92,587 ) $ 8,020,873 ______________________________________________________________ (1) Collectively, the "Parent Notes". (2) Collectively, the "Unregistered Notes". (3) Together, with our previously outstanding 6 1 / 8 % CAD Senior Notes due 2021 (the "CAD Notes due 2021"), the "CAD Notes".
Schedule of Leverage and Fixed Charge Ratios	Our leverage and fixed charge coverage ratios under the Credit Agreement as of December 31, 2017 and March 31, 2018, as well as our leverage ratio under our indentures as of December 31, 2017 and March 31, 2018 are as follows: December 31, 2017 March 31, 2018 Maximum/Minimum Allowable Net total lease adjusted leverage ratio 5.0 5.6 Maximum allowable of 6.5 Net secured debt lease adjusted leverage ratio 1.6 2.4 Maximum allowable of 4.0 Bond leverage ratio (not lease adjusted) 5.8 5.8 Maximum allowable of 6.5-7.0(1)(2) Fixed charge coverage ratio 2.1 2.2 Minimum allowable of 1.5 ______________________________________________________________ (1) The maximum allowable leverage ratio under our indentures for the 4 7 / 8 % Notes, the GBP Notes due 2025 and the 5 1 / 4 % Notes is 7.0 , while the maximum allowable leverage ratio under the indentures pertaining to our remaining senior and senior subordinated notes is 6.5 . In certain instances as provided in our indentures, we have the ability to incur additional indebtedness that would result in our bond leverage ratio exceeding the maximum allowable ratio under our indentures and still remain in compliance with the covenant. (2) At December 31, 2017, a portion of the net proceeds from the 5 1 / 4 % Notes, together with a portion of the net proceeds of the Equity Offering (as defined in Note 9), were used to temporarily repay approximately $807,000 of outstanding indebtedness under our Revolving Credit Facility until the closing of the IODC Transaction, which occurred on January 10, 2018 (as described in Note 4). The bond leverage ratio at December 31, 2017 is calculated based on our outstanding indebtedness at this date, which reflects the temporary payment of the Revolving Credit Facility.

Selected Consolidated Financi26

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors (Tables)	3 Months Ended
	Mar. 31, 2018
Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors
Schedule of selected consolidated Balance sheet statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED BALANCE SHEETS December 31, 2017 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 2,433 $ 634,317 $ 383,675 $ (94,726 ) $ 925,699 Accounts receivable — 32,972 802,770 — 835,742 Intercompany receivable 332,293 149,731 — (482,024 ) — Prepaid expenses and other 1,579 103,643 83,681 (29 ) 188,874 Total Current Assets 336,305 920,663 1,270,126 (576,779 ) 1,950,315 Property, Plant and Equipment, Net 316 2,030,875 1,386,488 — 3,417,679 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,578,995 — — (4,578,995 ) — Investment in subsidiaries 1,858,045 885,999 — (2,744,044 ) — Goodwill — 2,577,310 1,492,957 — 4,070,267 Other — 796,913 737,228 — 1,534,141 Total Other Assets, Net 6,437,040 4,260,222 2,230,185 (7,323,039 ) 5,604,408 Total Assets $ 6,773,661 $ 7,211,760 $ 4,886,799 $ (7,899,818 ) $ 10,972,402 Liabilities and Equity Intercompany Payable $ — $ — $ 482,024 $ (482,024 ) $ — Debit Balances Under Cash Pools — 56,233 38,493 (94,726 ) — Current Portion of Long-Term Debt — 54,247 92,082 (29 ) 146,300 Total Other Current Liabilities 235,062 527,549 421,262 — 1,183,873 Long-Term Debt, Net of Current Portion 4,232,759 758,166 1,906,046 — 6,896,971 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,578,995 — (4,578,995 ) — Other Long-term Liabilities — 113,024 241,974 — 354,998 Commitments and Contingencies (See Note 8) Redeemable Noncontrolling Interests 8,402 — 83,016 — 91,418 Total Iron Mountain Incorporated Stockholders' Equity 2,297,438 1,123,546 1,620,498 (2,744,044 ) 2,297,438 Noncontrolling Interests — — 1,404 — 1,404 Total Equity 2,297,438 1,123,546 1,621,902 (2,744,044 ) 2,298,842 Total Liabilities and Equity $ 6,773,661 $ 7,211,760 $ 4,886,799 $ (7,899,818 ) $ 10,972,402 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at December 31, 2017 is approximately $38,400 and $62,000 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. See Note 5 for more information on our Cash Pools. CONDENSED CONSOLIDATED BALANCE SHEETS (Continued) March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491 Accounts receivable — 28,731 830,375 — 859,106 Intercompany receivable 172,289 82,219 — (254,508 ) — Prepaid expenses and other — 125,373 97,932 (29 ) 223,276 Total Current Assets 175,483 311,384 1,323,590 (285,584 ) 1,524,873 Property, Plant and Equipment, Net 283 2,935,396 1,429,792 — 4,365,471 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,662,099 — — (4,662,099 ) — Investment in subsidiaries 1,875,464 893,419 — (2,768,883 ) — Goodwill — 2,813,151 1,512,327 — 4,325,478 Other — 1,027,985 754,342 — 1,782,327 Total Other Assets, Net 6,537,563 4,734,555 2,266,669 (7,430,982 ) 6,107,805 Total Assets $ 6,713,329 $ 7,981,335 $ 5,020,051 $ (7,716,566 ) $ 11,998,149 Liabilities and Equity Intercompany Payable $ — $ — $ 254,508 $ (254,508 ) $ — Debit Balances Under Cash Pools — 4,287 26,760 (31,047 ) — Current Portion of Long-Term Debt — 60,778 76,449 (29 ) 137,198 Total Other Current Liabilities 199,577 487,627 406,660 — 1,093,864 Long-Term Debt, Net of Current Portion 4,244,612 1,514,579 2,261,682 — 8,020,873 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,662,099 — (4,662,099 ) — Other Long-term Liabilities 185 120,998 270,879 — 392,062 Commitments and Contingencies (See Note 8) Redeemable Noncontrolling Interests 9,208 — 83,669 — 92,877 Total Iron Mountain Incorporated Stockholders' Equity 2,259,747 1,130,967 1,637,916 (2,768,883 ) 2,259,747 Noncontrolling Interests — — 1,528 — 1,528 Total Equity 2,259,747 1,130,967 1,639,444 (2,768,883 ) 2,261,275 Total Liabilities and Equity $ 6,713,329 $ 7,981,335 $ 5,020,051 $ (7,716,566 ) $ 11,998,149 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at March 31, 2018 is approximately $45,600 and $6,900 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. See Note 5 for more information on our Cash Pools.
Schedule of selected consolidated Income statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2017 Parent Guarantors Canada Non- Eliminations Consolidated Revenues: Storage rental $ — $ 349,351 $ 32,006 $ 190,922 $ — $ 572,279 Service — 218,209 16,050 132,338 — 366,597 Intercompany revenues — 1,097 — 22,342 (23,439 ) — Total Revenues — 568,657 48,056 345,602 (23,439 ) 938,876 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 239,329 7,550 179,828 — 426,707 Selling, general and administrative 79 162,705 3,561 73,821 — 240,166 Intercompany cost of sales — 6,606 15,736 1,097 (23,439 ) — Depreciation and amortization 46 76,161 4,238 44,262 — 124,707 (Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net — (548 ) 2 87 — (459 ) Total Operating Expenses 125 484,253 31,087 299,095 (23,439 ) 791,121 Operating (Loss) Income (125 ) 84,404 16,969 46,507 — 147,755 Interest Expense (Income), Net 42,784 (3,279 ) 11,670 34,880 — 86,055 Other Expense (Income), Net 81 2,519 (27 ) (8,937 ) — (6,364 ) (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (42,990 ) 85,164 5,326 20,564 — 68,064 Provision (Benefit) for Income Taxes — 12,744 (3,488 ) (36 ) — 9,220 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (101,115 ) (23,413 ) (157 ) (8,814 ) 133,499 — Income (Loss) from Continuing Operations 58,125 95,833 8,971 29,414 (133,499 ) 58,844 Income (Loss) from Discontinued Operations — 198 — (535 ) — (337 ) Net Income (Loss) 58,125 96,031 8,971 28,879 (133,499 ) 58,507 Less: Net Income (Loss) Attributable to Noncontrolling Interests — — — 382 — 382 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 58,125 $ 96,031 $ 8,971 $ 28,497 $ (133,499 ) $ 58,125 Net Income (Loss) $ 58,125 $ 96,031 $ 8,971 $ 28,879 $ (133,499 ) $ 58,507 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments (1,072 ) — 635 51,221 — 50,784 Equity in Other Comprehensive Income (Loss) of Subsidiaries 52,406 28,540 287 635 (81,868 ) — Total Other Comprehensive Income (Loss) 51,334 28,540 922 51,856 (81,868 ) 50,784 Comprehensive Income (Loss) 109,459 124,571 9,893 80,735 (215,367 ) 109,291 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — — (168 ) — (168 ) Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 109,459 $ 124,571 $ 9,893 $ 80,903 $ (215,367 ) $ 109,459 CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) (Continued) Three Months Ended March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Revenues: Storage rental $ — $ 396,476 $ 254,673 $ — $ 651,149 Service — 230,230 161,079 — 391,309 Intercompany revenues — 1,205 4,491 (5,696 ) — Total Revenues — 627,911 420,243 (5,696 ) 1,042,458 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 246,163 202,558 — 448,721 Selling, general and administrative 43 185,348 84,339 — 269,730 Intercompany cost of sales — 4,491 1,205 (5,696 ) — Depreciation and amortization 33 102,446 58,099 — 160,578 (Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net — (356 ) (774 ) — (1,130 ) Total Operating Expenses 76 538,092 345,427 (5,696 ) 877,899 Operating Income (Loss) (76 ) 89,819 74,816 — 164,559 Interest Expense (Income), Net 49,941 (1,508 ) 49,193 — 97,626 Other Expense (Income), Net (1,157 ) 1,560 19,748 — 20,151 (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (48,860 ) 89,767 5,875 — 46,782 Provision (Benefit) for Income Taxes — (6,712 ) 7,880 — 1,168 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (93,544 ) 2,865 — 90,679 — Income (Loss) from Continuing Operations 44,684 93,614 (2,005 ) (90,679 ) 45,614 (Loss) Income from Discontinued Operations, Net of Tax — (422 ) (40 ) — (462 ) Net Income (Loss) 44,684 93,192 (2,045 ) (90,679 ) 45,152 Less: Net (Loss) Income Attributable to Noncontrolling Interests — — 468 — 468 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 44,684 $ 93,192 $ (2,513 ) $ (90,679 ) $ 44,684 Net Income (Loss) $ 44,684 $ 93,192 $ (2,045 ) $ (90,679 ) $ 45,152 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments (5,635 ) — 37,286 — 31,651 Change in fair value of interest rate swap agreements (185 ) — — — (185 ) Equity in Other Comprehensive Income (Loss) of Subsidiaries 35,732 38,336 — (74,068 ) — Total Other Comprehensive Income (Loss) 29,912 38,336 37,286 (74,068 ) 31,466 Comprehensive Income (Loss) 74,596 131,528 35,241 (164,747 ) 76,618 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — 2,027 — 2,027 Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 74,596 $ 131,528 $ 33,214 $ (164,747 ) $ 74,591
Schedule of selected consolidated cash flow statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2017 Parent Guarantors Canada Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (41,288 ) $ 136,411 $ 5,291 $ 21,760 $ — $ 122,174 Cash Flows from Operating Activities—Discontinued Operations — 198 (535 ) — — (337 ) Cash Flows from Operating Activities (41,288 ) 136,609 4,756 21,760 — 121,837 Cash Flows from Investing Activities: Capital expenditures — (53,175 ) (2,555 ) (17,472 ) — (73,202 ) Cash paid for acquisitions, net of cash acquired — (6,380 ) — (5,807 ) — (12,187 ) Intercompany loans to subsidiaries (1,187 ) (72,807 ) — (478 ) 74,472 — Investment in subsidiaries (16,170 ) — — — 16,170 — Acquisitions of customer relationships and customer inducements — (20,653 ) (271 ) (479 ) — (21,403 ) Net proceeds from Divestments (see Note 10) — — — 2,423 — 2,423 Proceeds from sales of property and equipment and other, net (including real estate) — 93 2 (29 ) — 66 Cash Flows from Investing Activities—Continuing Operations (17,357 ) (152,922 ) (2,824 ) (21,842 ) 90,642 (104,303 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — — Cash Flows from Investing Activities (17,357 ) (152,922 ) (2,824 ) (21,842 ) 90,642 (104,303 ) Cash Flows from Financing Activities: Repayment of revolving credit, term loan facilities and other debt (31,733 ) (1,495,558 ) (71 ) (1,154,986 ) — (2,682,348 ) Proceeds from revolving credit, term loan facilities and other debt 94,811 1,423,653 — 1,196,319 — 2,714,783 Debit balances (payments) under cash pools — 138,693 — 47,129 (185,822 ) — Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net — — — 10,668 — 10,668 Intercompany loans from parent — (9,305 ) (12,680 ) 96,457 (74,472 ) — Equity contribution from parent — — — 16,170 (16,170 ) — Parent cash dividends (2,060 ) — — — — (2,060 ) Net (payments) proceeds associated with employee stock-based awards (4,308 ) — — — — (4,308 ) Payment of debt financing and stock issuance costs — — (73 ) — — (73 ) Cash Flows from Financing Activities—Continuing Operations 56,710 57,483 (12,824 ) 211,757 (276,464 ) 36,662 Cash Flows from Financing Activities—Discontinued Operations — — — — — — Cash Flows from Financing Activities 56,710 57,483 (12,824 ) 211,757 (276,464 ) 36,662 Effect of exchange rates on cash and cash equivalents — — (455 ) 5,403 — 4,948 (Decrease) Increase in cash and cash equivalents (1,935 ) 41,170 (11,347 ) 217,078 (185,822 ) 59,144 Cash and cash equivalents, beginning of period 2,405 23,380 17,110 193,589 — 236,484 Cash and cash equivalents, end of period $ 470 $ 64,550 $ 5,763 $ 410,667 $ (185,822 ) $ 295,628 CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Continued) Three Months Ended March 31, 2018 Parent Guarantors Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (66,516 ) $ 96,674 $ 61,410 $ — $ 91,568 Cash Flows from Operating Activities—Discontinued Operations — — — — — Cash Flows from Operating Activities (66,516 ) 96,674 61,410 — 91,568 Cash Flows from Investing Activities: Capital expenditures — (62,148 ) (33,457 ) — (95,605 ) Cash paid for acquisitions, net of cash acquired — (1,315,549 ) (113,425 ) — (1,428,974 ) Intercompany loans to subsidiaries 157,737 208,443 — (366,180 ) — Investment in subsidiaries — — — — — Acquisitions of customer relationships, customer inducements and data center lease-based intangibles — (11,874 ) (6,172 ) — (18,046 ) Proceeds from sales of property and equipment and other, net (including real estate) — (19,466 ) 79 — (19,387 ) Cash Flows from Investing Activities—Continuing Operations 157,737 (1,200,594 ) (152,975 ) (366,180 ) (1,562,012 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — Cash Flows from Investing Activities 157,737 (1,200,594 ) (152,975 ) (366,180 ) (1,562,012 ) Cash Flows from Financing Activities: Repayment of revolving credit, term loan facilities and other debt — (2,308,119 ) (2,102,537 ) — (4,410,656 ) Proceeds from revolving credit, term loan facilities and other debt — 3,067,988 2,428,503 — 5,496,491 Debit (payments) balances under cash pools — (51,946 ) (11,733 ) 63,679 — Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net — — (561 ) — (561 ) Intercompany loans from parent — (154,184 ) (211,996 ) 366,180 — Parent cash dividends (169,006 ) — — — (169,006 ) Net (payments) proceeds associated with employee stock-based awards (5,950 ) — — — (5,950 ) Net proceeds associated with the Over-Allotment Option exercise 76,192 — — — 76,192 Net proceeds associated with the At the Market (ATM) Program 8,716 — — — 8,716 Payment of debt financing and stock issuance costs (412 ) (9,075 ) (487 ) — (9,974 ) Cash Flows from Financing Activities—Continuing Operations (90,460 ) 544,664 101,189 429,859 985,252 Cash Flows from Financing Activities—Discontinued Operations — — — — — Cash Flows from Financing Activities (90,460 ) 544,664 101,189 429,859 985,252 Effect of exchange rates on cash and cash equivalents — — 1,984 — 1,984 Increase (Decrease) in cash and cash equivalents 761 (559,256 ) 11,608 63,679 (483,208 ) Cash and cash equivalents, beginning of period 2,433 634,317 383,675 (94,726 ) 925,699 Cash and cash equivalents, end of period $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2018
Segment Reporting [Abstract]
Schedule of analysis of business segment information and reconciliation	An analysis of our business segment information and reconciliation to the accompanying Condensed Consolidated Financial Statements is as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate Business Total As of and for the Three Months Ended March 31, 2017 Total Revenues $ 507,597 $ 100,834 $ 120,072 $ 189,241 $ 6,223 $ 14,909 $ 938,876 Storage Rental 298,183 68,824 71,567 117,615 5,858 10,232 572,279 Service 209,414 32,010 48,505 71,626 365 4,677 366,597 Depreciation and Amortization 60,535 8,251 14,297 27,676 1,424 12,524 124,707 Depreciation 51,952 6,063 10,888 19,305 1,360 10,024 99,592 Amortization 8,583 2,188 3,409 8,371 64 2,500 25,115 Adjusted EBITDA 209,530 55,270 34,142 55,347 1,506 (63,221 ) 292,574 Total Assets(1) 5,016,658 828,760 918,246 2,133,593 186,440 588,437 9,672,134 Expenditures for Segment Assets 51,888 7,906 5,025 18,620 8,895 14,458 106,792 Capital Expenditures 26,578 7,906 4,898 12,467 8,895 12,458 73,202 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 4,379 — — 5,808 — 2,000 12,187 Acquisitions of Customer Relationships and Customer Inducements 20,931 — 127 345 — — 21,403 As of and for the Three Months Ended March 31, 2018 Total Revenues 526,843 99,964 136,872 207,970 46,603 24,206 1,042,458 Storage Rental 304,819 69,246 83,952 131,747 45,495 15,890 651,149 Service 222,024 30,718 52,920 76,223 1,108 8,316 391,309 Depreciation and Amortization 62,752 10,104 17,770 31,659 22,268 16,025 160,578 Depreciation 49,138 8,023 12,905 18,917 11,380 13,069 113,432 Amortization 13,614 2,081 4,865 12,742 10,888 2,956 47,146 Adjusted EBITDA 225,738 53,852 44,082 60,631 20,790 (62,078 ) 343,015 Total Assets(1) 5,030,238 833,690 929,402 2,429,438 1,875,766 899,615 11,998,149 Expenditures for Segment Assets 43,181 6,853 7,584 32,056 1,438,012 14,939 1,542,625 Capital Expenditures 29,870 6,853 6,151 25,038 13,111 14,582 95,605 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 1,551 — — 3,208 1,424,215 — 1,428,974 Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs 11,760 — 1,433 3,810 686 357 18,046 ________________________________________________________ (1) Excludes all intercompany receivables or payables and investment in subsidiary balances.
Schedule of reconciliation of Adjusted EBITDA to income from continuing operations	A reconciliation of Adjusted EBITDA to income (loss) from continuing operations on a consolidated basis is as follows: Three Months Ended 2017 2018 Adjusted EBITDA $ 292,574 $ 343,015 (Add)/Deduct: Provision (Benefit) for Income Taxes 9,220 1,168 Other (Income) Expense, Net (6,364 ) 20,151 Interest Expense, Net 86,055 97,626 (Gain) loss on disposal/write-down of property, plant and equipment (excluding real estate), net (459 ) (1,130 ) Depreciation and Amortization 124,707 160,578 Significant Acquisition Costs(1) 20,571 19,008 Income (Loss) from Continuing Operations $ 58,844 $ 45,614 _______________________________________________________________________________ (1) Represents operating expenditures associated with (1) the Recall Transaction (as defined in Note 1 in Notes to Consolidated Financial Statements included in our Annual Report), including: (i) advisory and professional fees to complete the Recall Transaction; (ii) costs associated with the Divestments (as defined in Note 10) required in connection with receipt of regulatory approvals (including transitional services); and (iii) costs to integrate Recall Holdings Limited ("Recall") with our existing operations, including moving, severance, facility upgrade, REIT conversion and system upgrade costs, as well as certain costs associated with our shared service center initiative for our finance, human resources and information technology functions; and (2) the advisory and professional fees to complete the IODC Transaction (collectively, "Significant Acquisition Costs").

Stockholders' Equity Matters (T

Stockholders' Equity Matters (Tables)	3 Months Ended
	Mar. 31, 2018
Equity [Abstract]
Schedule of dividend declared and payments	In fiscal year 2017 and in the first three months of 2018 , our board of directors declared the following dividends: Declaration Date Dividend Record Date Total Payment Date February 15, 2017 $ 0.5500 March 15, 2017 $ 145,235 April 3, 2017 May 24, 2017 0.5500 June 15, 2017 145,417 July 3, 2017 July 27, 2017 0.5500 September 15, 2017 146,772 October 2, 2017 October 24, 2017 0.5875 December 15, 2017 166,319 January 2, 2018 February 14, 2018 0.5875 March 15, 2018 167,969 April 2, 2018

Divestments (Tables)

Divestments (Tables)	3 Months Ended
	Mar. 31, 2018
Discontinued Operations and Disposal Groups [Abstract]
Disposal Groups, Including Discontinued Operations	The table below summarizes certain results of operations of the Recall Divestments (as defined in Note 14 to Notes to Consolidated Financial Statements included in our Annual Report) included in discontinued operations for the three months ended March 31, 2017 and 2018: Three Months Ended March 31, Description 2017 2018 (Loss) Income from Discontinued Operations Before (Benefit) Provision for Income Taxes $ (429 ) $ (496 ) (Benefit) Provision for Income Taxes (92 ) (34 ) (Loss) Income from Discontinued Operations, Net of Tax $ (337 ) $ (462 )

Significant Acquisition Costs (

Significant Acquisition Costs (Tables)	3 Months Ended
	Mar. 31, 2018
Business Combinations [Abstract]
Acquisition costs Included in Statement of Operations	Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations are as follows: Three Months Ended 2017 2018 Cost of sales (excluding depreciation and amortization) $ 7,887 $ 296 Selling, general and administrative expenses 12,684 18,712 Total Significant Acquisition Costs $ 20,571 $ 19,008 Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations by segment are as follows: Three Months Ended 2017 2018 North American Records and Information Management Business $ 7,299 $ 584 North American Data Management Business 745 — Western European Business 3,216 2,152 Other International Business 1,651 537 Global Data Center Business — 10,181 Corporate and Other Business 7,660 5,554 Total Significant Acquisition Costs $ 20,571 $ 19,008
Restructuring and Related Costs [Table Text Block]	A rollforward of accrued liabilities related to Significant Acquisition Costs on our Condensed Consolidated Balance Sheets as of December 31, 2017 to March 31, 2018 is as follows: Accrual for Significant Acquisition Costs Balance at December 31, 2017 $ 12,622 Amounts accrued 1,038 Change in estimates(1) — Payments (5,867 ) Currency translation adjustments 85 Balance at March 31, 2018(2) $ 7,878 _______________________________________________________________________________ (1) Includes adjustments made to amounts accrued in a prior period. (2) Accrued liabilities related to Significant Acquisition Costs as of March 31, 2018 presented in the table above generally related to employee severance costs and onerous lease liabilities associated with the Recall Transaction. We expect that the majority of these liabilities will be paid throughout 2018. Additional Significant Acquisition Costs recorded in our Condensed Consolidated Statement of Operations for the three months ended March 31, 2018 have either been settled in cash during the three months ended March 31, 2018 or are included in our Condensed Consolidated Balance Sheet as of March 31, 2018 as a component of accounts payable.

Summary of Significant Accoun31

Summary of Significant Accounting Policies - Cash and Cash Equivalents and Foreign Currency (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash	$ 18,360	$ 22,167

Summary of Significant Accoun32

Summary of Significant Accounting Policies - (Gain) Loss on Foreign Currency Transactions (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Total loss on foreign currency transactions	$ 21,785	$ (4,164)

Summary of Significant Accoun33

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Finite-Lived Intangible Assets and Liabilities Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Goodwill and Intangible Asset Impairment		$ 3,011
Customer Relationships | Minimum
Finite-Lived Intangible Assets
Amortization period	10 years
Customer Relationships | Maximum
Finite-Lived Intangible Assets
Amortization period	30 years
Customer inducements | Minimum
Finite-Lived Intangible Assets
Amortization period	10 years
Customer inducements | Maximum
Finite-Lived Intangible Assets
Amortization period	30 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Minimum
Finite-Lived Intangible Assets
Amortization period	5 years
Customer Inducements, Current Record Management Vendor Or Payments To Customers [Member] | Maximum
Finite-Lived Intangible Assets
Amortization period	15 years

Summary of Significant Accoun34

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Schedule of Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Customer relationship intangible assets
Assets:
Finite-Lived Intangible Assets, Gross	$ 1,728,685	$ 1,704,105
Finite-Lived Intangible Assets, Accumulated Amortization	(427,550)	(395,278)
Finite-Lived Intangible Assets, Net Carrying Amount	1,301,135	1,308,827
Customer inducements
Assets:
Finite-Lived Intangible Assets, Gross	57,502	140,030
Finite-Lived Intangible Assets, Accumulated Amortization	(35,149)	(66,981)
Finite-Lived Intangible Assets, Net Carrying Amount	22,353	73,049
Data center lease-based intangible assets
Assets:
Finite-Lived Intangible Assets, Gross	282,609	19,314
Finite-Lived Intangible Assets, Accumulated Amortization	(13,609)	(643)
Finite-Lived Intangible Assets, Net Carrying Amount	269,000	18,671
Liabilities:
Data center Below Market Lease, Gross Carrying Amount	11,421	0
Below Market Lease, Accumulated Amortization	(349)	0
Below Market Lease, Net Carrying Amount	11,072	0
Customer relationships, customer inducements and data center
Assets:
Finite-Lived Intangible Assets, Gross	2,068,796	1,863,449
Finite-Lived Intangible Assets, Accumulated Amortization	(476,308)	(462,902)
Finite-Lived Intangible Assets, Net Carrying Amount	$ 1,592,488	$ 1,400,547

Summary of Significant Accoun35

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Schedule Of Other Finite-Lived Intangile Assets (Details) - Other finite-lived intangible assets - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Finite-Lived Intangible Assets
Amortization period	4 years
Finite-Lived Intangible Assets, Gross	$ 20,974	$ 20,929
Finite-Lived Intangible Assets, Accumulated Amortization	(11,936)	(10,728)
Finite-Lived Intangible Assets, Net	$ 9,038	$ 10,201

Summary of Significant Accoun36

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 47,146	$ 25,115
Customer relationship intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	26,337	20,133
Customer inducements
Finite-Lived Intangible Assets
Amortization of Intangible Assets	2,469	2,666
Leases Acquired In Place and Tenant Relationships [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	10,838	0
Other finite-lived intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	1,185	2,316
Permanent withdrawal fees
Finite-Lived Intangible Assets
Amortization of Intangible Assets	2,585	3,158
Data Center Above and Below Market Leases [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 1,079	$ 0

Summary of Significant Accoun37

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization	$ 50,699	$ 29,022
Commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Amortization Period	3 years
Contract Duration Term	1 year
Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Percentage of consolidated revenue	5.00%
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Capitalized Contract Cost, Amortization Period	3 years
Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 29,461
Commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization	3,587
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Amortization	$ 2,730

Summary of Significant Accoun38

Summary of Significant Accounting Policies - Revenue - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018
Commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount	$ 19,948
Accumulated Amortization	(24,781)	$ (21,173)
Gross Carrying Amount	44,729	42,072
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount	16,533
Accumulated Amortization	(17,875)	(14,954)
Gross Carrying Amount	$ 34,408	31,604
Accounting Standards Update 2014-09 | Commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount		20,899
Accounting Standards Update 2014-09 | Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount		$ 16,650

Summary of Significant Accoun39

Summary of Significant Accounting Policies - Revenue - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Jan. 01, 2018	Dec. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue	$ 267,925		$ 241,590
Other Long-term Liabilities	96,731		$ 73,039
Difference between Revenue Guidance in Effect before and after Topic 606 | Accounting Standards Update 2014-09
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue	10,482	$ 9,953
Other Long-term Liabilities	$ 9,639	$ 9,453

Summary of Significant Accoun40

Summary of Significant Accounting Policies - Revenue - Summary of Condensed Consolidated Statements of Operations (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,042,458	$ 938,876
Operating Income	164,559	147,755
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	45,614	58,844
Income from Continuing Operations	$ 46,782	$ 68,064
Income (Loss) from continuing operations (in dollars per share)	$ 0.16	$ 0.22
Income (Loss) from continuing operations (in dollars per share)	$ 0.16	$ 0.22
Calculated under Revenue Guidance in Effect before Topic 606
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,041,264
Operating Income	165,319
Income from Continuing Operations	$ 46,374
Income (Loss) from continuing operations (in dollars per share)	$ 0.16
Income (Loss) from continuing operations (in dollars per share)	$ 0.16

Summary of Significant Accoun41

Summary of Significant Accounting Policies - Schedule of Changes in Carrying Value of Goodwill, by Reportable Operating Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Dec. 31, 2017
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	$ 138
Goodwill	4,325,478	$ 4,070,267
Gross amount of goodwill [Roll Forward]
Beginning balance	4,386,861
Non-deductible goodwill acquired during the year	229,539
Fair value and other adjustments	10,712
Currency effects	15,098
Ending balance	4,642,210
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	316,594
Accumulated amortization. ending balance	316,732
Accumulated goodwill impairment, beginning balance	135,420
Accumulated goodwill impairment, ending balance	135,420
North American Records and Information Management Business
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	(198)
Goodwill	2,264,173	2,269,446
Gross amount of goodwill [Roll Forward]
Beginning balance	2,474,829
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	122
Currency effects	(5,593)
Ending balance	2,469,358
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	205,383
Accumulated amortization. ending balance	205,185
Accumulated goodwill impairment, beginning balance	85,909
Accumulated goodwill impairment, ending balance	85,909
North American Data Management Business
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	(50)
Goodwill	496,373	497,851
Gross amount of goodwill [Roll Forward]
Beginning balance	551,726
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	0
Currency effects	(1,528)
Ending balance	550,198
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	53,875
Accumulated amortization. ending balance	53,825
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Western European Business
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	376
Goodwill	409,998	396,489
Gross amount of goodwill [Roll Forward]
Beginning balance	453,537
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	0
Currency effects	13,885
Ending balance	467,422
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	57,048
Accumulated amortization. ending balance	57,424
Accumulated goodwill impairment, beginning balance	46,500
Accumulated goodwill impairment, ending balance	46,500
Other International Business
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	10
Goodwill	860,022	846,433
Gross amount of goodwill [Roll Forward]
Beginning balance	846,721
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	5,886
Currency effects	7,713
Ending balance	860,320
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	288
Accumulated amortization. ending balance	298
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Global Data Center Business [Member]
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	0
Goodwill	229,539	0
Gross amount of goodwill [Roll Forward]
Beginning balance	0
Non-deductible goodwill acquired during the year	229,539
Fair value and other adjustments	0
Currency effects	0
Ending balance	229,539
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	0
Accumulated amortization. ending balance	0
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Corporate and Other
Goodwill
Goodwill, Accumulated Amortization Translation and Purchase Accounting Adjustments	0
Goodwill	65,373	$ 60,048
Gross amount of goodwill [Roll Forward]
Beginning balance	60,048
Non-deductible goodwill acquired during the year	0
Fair value and other adjustments	4,704
Currency effects	621
Ending balance	65,373
Goodwill accumulated amortization [Roll Forward]
Accumulated amortization. beginning balance	0
Accumulated amortization. ending balance	0
Accumulated goodwill impairment, beginning balance	3,011
Accumulated goodwill impairment, ending balance	$ 3,011

Summary of Significant Accoun42

Summary of Significant Accounting Policies - Schedule of Components of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Amortizable intangible assets
Revenue reduction associated with amortization of permanent withdrawal fees	$ 3,664	$ 3,158
Customer Relationships
Amortizable intangible assets
Finite-Lived Intangible Assets, Gross	1,728,685		$ 1,704,105
Accumulated amortization	(427,550)		(395,278)
Net carrying amount	1,301,135		1,308,827
Customer inducements
Amortizable intangible assets
Finite-Lived Intangible Assets, Gross	57,502		140,030
Accumulated amortization	(35,149)		(66,981)
Net carrying amount	22,353		73,049
Data Center Business
Amortizable intangible assets
Finite-Lived Intangible Assets, Gross	282,609		19,314
Below Market Lease, Accumulated Amortization	349		0
Below Market Lease, Net	11,072		0
Accumulated amortization	(13,609)		(643)
Net carrying amount	269,000		18,671
Below Market Lease, Gross	11,421		0
Other finite-lived intangible assets
Amortizable intangible assets
Finite-Lived Intangible Assets, Gross	20,974		20,929
Accumulated amortization	11,936		10,728
Net carrying amount	$ 9,038		$ 10,201

Summary of Significant Accoun43

Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee stock-based awards
Weighted Average Common Shares Outstanding-Basic (in shares)	285,259,000	263,855,000
Stock-based compensation	$ 7,384	$ 6,549
Stock-based compensation expense (income), net of tax	$ 6,833	$ 5,777
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.02	$ 0.02
Certain options as a percentage of total outstanding options	100.00%
Summary of option activity
Options outstanding balance, end of period (in shares)	4,478,539
Share-Based Compensation, aggregate disclosures
Employee stock-based awards, unrecognized compensation costs on nonvested awards	$ 64,416
Employee stock-based awards, unrecognized compensation costs on nonvested awards, weighted average period of recognition	2 years 4 months 2 days
Continuing Operations
Employee stock-based awards
Stock-based compensation	$ 7,384	$ 6,549
Continuing Operations | Cost of sales (excluding depreciation and amortization)
Employee stock-based awards
Stock-based compensation	29	28
Continuing Operations | Selling, general and administrative expenses
Employee stock-based awards
Stock-based compensation	$ 7,355	$ 6,521
Three year vesting options
Employee stock-based awards
Certain options as a percentage of total outstanding options	91.80%
Summary of option activity
Options outstanding balance, end of period (in shares)	4,111,684
Five year vesting options
Employee stock-based awards
Certain options as a percentage of total outstanding options	8.20%
Summary of option activity
Options outstanding balance, end of period (in shares)	366,855
Stock Options
Employee stock-based awards
Weighted average fair value of options granted (in dollars per share)	$ 3.50	$ 4.26
Weighted average assumptions used for grants
Expected volatility (as a percent)	25.40%	25.80%
Risk-free interest rate (as a percent)	2.65%	1.96%
Expected dividend yield (as a percent)	7.00%	6.00%
Expected life of the option	5 years	5 years
Summary of option activity
Options outstanding balance, beginning of period (in shares)	3,671,740
Options granted (in shares)	839,437
Options exercised (in shares)	(20,223)
Options forfeited (in shares)	(9,673)
Options expired (in shares)	(2,742)
Options outstanding balance, end of period (in shares)	4,478,539
Options exercisable balance (in shares)	2,498,039
Options expected to vest (in shares)	1,831,809
Weighted Average Exercise Price
Weighted average exercise price, options outstanding balance beginning of period (in dollars per share)	$ 34.41
Weighted average exercise price, options granted (in dollars per share)	33.72
Weighted average exercise price, options exercised (in dollars per share)	19.41
Weighted average exercise price, options forfeited (in dollars per share)	35.12
Weighted average exercise price, options expired (in dollars per share)	37.71
Weighted average exercise price, options outstanding balance end of period (in dollars per share)	34.34
Weighted average exercise price, options exercisable (in dollars per share)	33.73
Weighted average exercise price, options expected to vest (in dollars per share)	$ 35.12
Weighted average remaining contractual term
Weighted average remaining contractual term, options outstanding	7 years 6 months 29 days
Weighted average remaining contractual term, options exercisable	6 years 4 months 21 days
Weighted average remaining contractual term, options expected to vest	9 years 29 days
Aggregate intrinsic value
Aggregate intrinsic value, options outstanding	$ 8,201
Aggregate intrinsic value, options exercisable	7,815
Aggregate intrinsic value, options expected to vest	367
Aggregate intrinsic value of stock options exercised
Aggregate intrinsic value of stock options exercised	$ 393	$ 1,912
Employee Stock Purchase Plan
Employee Stock Purchase Plan
Percentage of market price for the purchase of shares	95.00%
Employee stock purchase plan, shares available for grant	624,768
Performance units
Dividends accrued
Accrued cash dividends	$ 450	324
Cash dividends paid	$ 644	205
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	467,811
Granted (in shares)	347,576
Vested (in shares)	(79,121)
Forfeited (in shares)	(52,507)
Non-vested at the end of the period (in shares)	683,759
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$ 39.28
Weighted average grant date fair value, granted (in dollars per share)	33.64
Weighted average grant date fair value, vested (in dollars per share)	38.34
Weighted average grant date fair value, forfeited (in dollars per share)	38.28
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$ 36.60
Total fair value of shares or units vested	$ 3,033	905
Performance units disclosure
Period of anniversary from the date of grant	3 years
Qualifying age for grant of performance units	55 years
Qualifying service period	10 years
Performance units | PUs granted in 2015
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units | Two Thousand Sixteen [Member] [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units | Two Thousand Seventeen [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units | Revenue or revenue growth and return on invested capital
Performance units disclosure
Performance period	3 years
Performance units | Market condition associated with shareholder return of common stock
Performance units disclosure
Performance period	3 years
Performance units | Minimum | Revenue or revenue growth and return on invested capital
Performance units disclosure
Percentage payout rate	0.00%
Performance units | Minimum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	0.00%
Performance units | Maximum | Revenue or revenue growth and return on invested capital
Performance units disclosure
Percentage payout rate	200.00%
Performance units | Maximum | Market condition associated with shareholder return of common stock
Performance units disclosure
Percentage payout rate	200.00%
Original PU Awards
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	717,878
Granted (in shares)	347,576
Vested (in shares)	(79,121)
Forfeited (in shares)	(2,626)
Non-vested at the end of the period (in shares)	983,707
PUs Adjustment
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	(250,067)
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(49,881)
Non-vested at the end of the period (in shares)	(299,948)
Restricted Stock Units
Employee stock-based awards
Accrued cash dividends	$ 721	683
Dividends accrued
Cash dividends paid	$ 2,043	1,855
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	1,071,469
Granted (in shares)	611,030
Vested (in shares)	(436,489)
Forfeited (in shares)	(24,035)
Non-vested at the end of the period (in shares)	1,221,975
Weighted average grant date fair value
Weighted average grant date fair value, non-vested, beginning of period (in dollars per share)	$ 35.38
Weighted average grant date fair value, granted (in dollars per share)	33.58
Weighted average grant date fair value, vested (in dollars per share)	35.12
Weighted average grant date fair value, forfeited (in dollars per share)	36.43
Weighted average grant date fair value, non-vested, end of period (in dollars per share)	$ 34.55
Total fair value of shares or units vested	$ 15,330	$ 14,026
Restricted Stock Units | Minimum
Employee stock-based awards
Award vesting period	3 years

Summary of Significant Accoun44

Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubful Accounts, Income Taxes, and Concentration of Credit Risk (Details) $ / shares in Units, $ in Thousands	3 Months Ended		12 Months Ended
	Mar. 31, 2018USD ($)bank$ / sharesshares	Mar. 31, 2017USD ($)$ / sharesshares	Dec. 31, 2017USD ($)bankfund	Dec. 31, 2016USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Concentration Risk, Number of "Triple A" Rated Money Market Funds | fund			12
Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings, Cash And Liquid Assets			15.50%
Income (Loss) Per Share-Basic and Diluted
Income (loss) from continuing operations	$ 45,614	$ 58,844
Less: Net Income (Loss) Attributable to Noncontrolling Interests	468	382
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation)	45,146	58,462
Income (loss) from discontinued operations, net of tax	(462)	(337)
Net income (loss) attributable to Iron Mountain Incorporated	$ 44,684	$ 58,125
Weighted-average shares—basic | shares	285,259,000	263,855,000
Effect of dilutive potential stock options (in shares) | shares	249,564	461,761
Effect of dilutive potential restricted stock, RSUs and PUs (in shares) | shares	484,314	492,905
Weighted-average shares—diluted | shares	285,992,878	264,809,666
Earnings (Losses) per share-basic:
Income (Loss) from continuing operations (in dollars per share) | $ / shares	$ 0.16	$ 0.22
Total (loss) income discontinued operations (in dollars per share) | $ / shares	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) | $ / shares	0.16	0.22
Earnings (Losses) per share-diluted:
Income (Loss) from continuing operations (in dollars per share) | $ / shares	0.16	0.22
Total (loss) income from discontinued operations (in dollars per share) | $ / shares	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share) | $ / shares	$ 0.16	$ 0.22
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares) | shares	3,242,141	2,494,255
Income Taxes:
Effective tax rates (as a percent)	2.50%	13.50%
Income (Loss) From Continuing Operations Before Income Taxes, Minority Interest, and (Gain) Loss on Disposition of Real Estate	$ 46,782	$ 68,064
Provision (Benefit) for Income Taxes	$ 1,168	$ 9,220
Federal statutory tax rate (as a percent)	21.00%	35.00%
Tax Matter Resolution, amount released	$ 14,000
Effective Income Tax Rate Reconciliation, Change in Deferred Tax Assets Valuation Allowance, Amount		$ 7,511
Concentrations of Credit Risk
Number of global banks with cash, cash equivalent and restricted cash held on deposit | bank	7		7
Cash and cash equivalents	$ 442,491	295,628	$ 925,699	$ 236,484
Effective Income Tax Rate Reconciliation Repatriation Of Foreign Earnings, Non-Liquid Assets			8.00%
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Liability			$ 186,000
Income Tax Reconciliation Repatriation Of Foreign Earnings, Attributable To REIT			82,000
Tax Provision, Increase, Amount		$ 1,764
Tax Provision, Increase, Percentage		2.50%
Money Market Funds, at Carrying Value	0		585,000
Time Deposits, at Carrying Value	$ 16,678		$ 24,482

Summary of Significant Accoun45

Summary of Significant Accounting Policies - Fair Value Measurements (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Assets and liabilities carried at fair value measured on a recurring basis
Money Market Funds, at Carrying Value	$ 0	$ 585,000
Time Deposits, at Carrying Value	16,678	24,482
Fair value measured on recurring basis | Quoted prices in active markets (Level 1)
Assets and liabilities carried at fair value measured on a recurring basis
Money Market Funds, at Carrying Value		0
Time Deposits, at Carrying Value	0	0
Trading securities	10,739	11,279
Foreign Currency Contract, Asset, Fair Value Disclosure		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Interest Rate Swap	0
Fair value measured on recurring basis | Significant other observable inputs (Level 2)
Assets and liabilities carried at fair value measured on a recurring basis
Money Market Funds, at Carrying Value		585,000
Time Deposits, at Carrying Value	16,678	24,482
Trading securities	390	505
Foreign Currency Contract, Asset, Fair Value Disclosure		1,579
Foreign Currency Contracts, Liability, Fair Value Disclosure	1,102	2,329
Interest Rate Swap	185
Fair value measured on recurring basis | Significant unobservable inputs (Level 3)
Assets and liabilities carried at fair value measured on a recurring basis
Money Market Funds, at Carrying Value		0
Time Deposits, at Carrying Value	0	0
Trading securities	0	0
Foreign Currency Contract, Asset, Fair Value Disclosure		0
Foreign Currency Contracts, Liability, Fair Value Disclosure	0	0
Interest Rate Swap	0
Estimate of Fair Value Measurement [Member] | Fair value measured on recurring basis
Assets and liabilities carried at fair value measured on a recurring basis
Money Market Funds, at Carrying Value		585,000
Time Deposits, at Carrying Value	16,678	24,482
Trading securities	11,129	11,784
Foreign Currency Contract, Asset, Fair Value Disclosure		1,579
Foreign Currency Contracts, Liability, Fair Value Disclosure	1,102	$ 2,329
Interest Rate Swap	$ 185

Summary of Significant Accoun46

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (103,989)	$ (212,573)
Other comprehensive loss:
Foreign currency translation adjustments	30,092	51,334
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(185)	0
Total Other comprehensive (loss) income	29,907	51,334
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(74,082)	(161,239)
Total loss on foreign currency transactions	21,785	(4,164)
Other, net	(1,634)	(2,200)
Other (Income) Expense, Net	20,151	(6,364)
Foreign currency translation adjustments
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(103,989)	(212,573)
Other comprehensive loss:
Foreign currency translation adjustments	30,092	51,334
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0
Total Other comprehensive (loss) income	30,092	51,334
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(73,897)	$ (161,239)
Market value adjustments for securities
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	0
Other comprehensive loss:
Foreign currency translation adjustments	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(185)
Total Other comprehensive (loss) income	(185)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	$ (185)

Summary of Significant Accoun47

Summary of Significant Accounting Policies - Property, Plant and Equipment and Long-Lived Assets (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Accounting Policies [Abstract]
Capitalization of internal use computer software	$ 3,789	$ 5,283
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	$ (1,130)	$ (459)

Summary of Significant Accoun48

Summary of Significant Accounting Policies - Cash dividends on RSUs (Details) - Restricted Stock Units - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Employee stock-based awards
Accrued cash dividends	$ 721	$ 683
Cash dividends paid	$ 2,043	$ 1,855

Derivative Instruments and He49

Derivative Instruments and Hedging Activities (Details) € in Thousands, $ in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)	Mar. 31, 2017USD ($)	Mar. 31, 2018EUR (€)	Dec. 31, 2017USD ($)	Dec. 31, 2017EUR (€)	Dec. 31, 2017CAD ($)	Mar. 31, 2017EUR (€)
Derivative instruments
Cash receipts	$ 91,568	$ 122,174
Net Investment Hedging [Member] | Designated as Hedging Instrument
Derivative instruments
Derivatives used in Net Investment Hedge, Net of Tax	2,447
Former Revolving Credit Facility [Member] | Net Investment Hedging [Member] | Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives | €							€ 49,600
Senior Notes 4.375 Percent due 2021 | Net Investment Hedging [Member] | Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives | €			€ 164,244
Foreign Exchange Forward - Option One [Member] | Purchases
Derivative instruments
Notional amount of derivatives				$ 138,823
Foreign Exchange Forward - Option One [Member] | Sales
Derivative instruments
Derivative, amount of hedged item						$ 176,000
Interest Rate Swap | Designated as Hedging Instrument
Derivative instruments
Notional amount of derivatives	350,000
Unrealized loss	185
Foreign exchange contracts
Derivative instruments
Cash receipts	6,343
Foreign exchange contracts | Purchases
Derivative instruments
Notional amount of derivatives | €			€ 133,000		€ 135,000
Foreign exchange contracts | Sales
Derivative instruments
Derivative, amount of hedged item	165,799			160,757
Foreign Exchange Forward - Option Two [Member] | Purchases
Derivative instruments
Notional amount of derivatives				$ 114,390
Foreign Exchange Forward - Option Two [Member] | Sales
Derivative instruments
Derivative, amount of hedged item | €					€ 96,150
Other Long-Term Liabilities | Interest Rate Swap
Derivative instruments
Derivative liability	$ 185

Derivative Instruments and He50

Derivative Instruments and Hedging Activities - Fair Value of Derivative Instruments Not Designated as Heding Instruments (Details) - Not Designated as Hedging Instrument - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Prepaid expenses and other
Fair value of derivative instruments
Derivative assets	$ 0	$ 1,579
Accrued expenses
Fair value of derivative instruments
Derivative liabilities	$ 1,102	$ 2,329

Derivative Instruments and He51

Derivative Instruments and Hedging Activities - Amount of (Gain) Loss in Income on Derivatives (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Not Designated as Hedging Instrument
Gains and losses on derivative instruments
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	$ (5,991)	$ 0

Derivative Instruments and He52

Derivative Instruments and Hedging Activities - Schedule of Foreign Exchange Gains Related to Fair of Debt (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Derivative Instruments and Hedging Activities Disclosure [Abstract]
Foreign exchange (losses) gains	$ (5,635)	$ (1,072)

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) € in Thousands, £ in Thousands, $ in Thousands, $ in Thousands	Mar. 08, 2018USD ($)data_center	Mar. 08, 2018GBP (£)data_center	Mar. 08, 2018SGD ($)data_center	Jan. 10, 2018USD ($)	Dec. 29, 2017USD ($)	Nov. 30, 2017EUR (€)	Mar. 31, 2018USD ($)
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Cash consideration							$ 1,347,046
Consideration transferred				$ 1,347,000			1,347,046
Business Combination, Contingent Consideration, Liability				$ 35,000
Business combination separately recognized transactions expenses and losses recognized, acquisition costs incurred to date							$ 28,064
Credit Suisse Data Center Acquisition
Business Acquisition [Line Items]
Number Of Data Centers | data_center	2	2	2
Consideration transferred	$ 111,400	£ 34,600	$ 81,000
Santa Fe China [Member]
Business Acquisition [Line Items]
Consideration transferred | €						€ 14,000
Santa Fe China - Beijing Property [Member]
Business Acquisition [Line Items]
Consideration transferred | €						9,000
Santa Fe China Transaction [Member]
Business Acquisition [Line Items]
Consideration transferred					$ 16,800	€ 23,000

Acquisitions - Pro Forma Financ

Acquisitions - Pro Forma Financial Information (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Combinations [Abstract]
Total Revenues	$ 1,045,929	$ 973,757
Income from Continuing Operations	$ 55,181	$ 17,431
Per Share Income from Continuing Operations - Basic	$ 0.19	$ 0.06
Per Share Income from Continuing Operations - Diluted	$ 0.19	$ 0.06

Acquisitions - Schedule of Purc

Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 10, 2018	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Business Acquisition [Line Items]
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		$ 149	$ 0
Fair Value of Identifiable Assets Acquired:
Goodwill		4,325,478		$ 4,070,267
Fiscal Year 2017 Acquisitions
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		112,947
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		149
Total Consideration		113,096
Fair Value of Identifiable Assets Acquired:
Cash		0
Accounts Receivable and Prepaid Expenses		558
Property, Plant and Equipment		111,267
Customer Relationship Intangible Assets		1,593
Customer Relationship Intangible Assets		9,492
Data Center Tenant Relationships		0
Data Center Above-Market Leases		0
Accounts Payable, Accrued Expenses and Other Liabilities		0
Deferred Income Taxes		(9,814)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		0
Total Fair Value of Identifiable Net Assets Acquired		113,096
Goodwill		0
Cash Acquired from Acquisition		34,227
Payments for (Proceeds from) Previous Acquisition		3,208
Series of Individually Immaterial Business Acquisitions and IODC Transaction [Member]
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		1,459,993
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		149
Total Consideration		1,460,142
Fair Value of Identifiable Assets Acquired:
Cash		34,227
Accounts Receivable and Prepaid Expenses		7,628
Property, Plant and Equipment		974,294
Customer Relationship Intangible Assets		1,593
Customer Relationship Intangible Assets		138,005
Data Center Tenant Relationships		102,850
Data Center Above-Market Leases		16,439
Accounts Payable, Accrued Expenses and Other Liabilities		(23,198)
Deferred Income Taxes		(9,814)
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		(11,421)
Total Fair Value of Identifiable Net Assets Acquired		1,230,603
Goodwill		229,539
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)		1,347,046
Business Combination, Consideration Transferred, Accrued Purchase Price and Other Holdbacks		0
Total Consideration	$ 1,347,000	1,347,046
Fair Value of Identifiable Assets Acquired:
Cash		34,227
Accounts Receivable and Prepaid Expenses		7,070
Property, Plant and Equipment		863,027
Customer Relationship Intangible Assets		0
Customer Relationship Intangible Assets		128,513
Data Center Tenant Relationships		102,850
Data Center Above-Market Leases		16,439
Accounts Payable, Accrued Expenses and Other Liabilities		(23,198)
Deferred Income Taxes		0
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Data Center Below Market Leases		(11,421)
Total Fair Value of Identifiable Net Assets Acquired		1,117,507
Goodwill		$ 229,539

Debt Schedule of Long Term Debt

Debt Schedule of Long Term Debt (Details) $ in Thousands, $ in Thousands	Mar. 31, 2018USD ($)	Mar. 31, 2018AUD ($)	Mar. 27, 2018AUD ($)	Dec. 31, 2017USD ($)	Dec. 31, 2017AUD ($)	Aug. 21, 2017USD ($)	Sep. 28, 2016AUD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 8,250,658			$ 7,129,511
Unamortized Debt Issuance Expense	(92,587)			(86,240)
Long-term Debt	8,158,071			7,043,271
Long-term Debt, Gross, Current Maturities	(137,198)			(146,300)
Unamortized Debt Issuance Expense, Current	0			0
Long-term Debt, Current Maturities	(137,198)			(146,300)
Long Term Debt, Gross, Net of Current Portion	8,113,460			6,983,211
Unamortized Debt Issuance Expense, Net	92,587			86,240
Long-term Debt, Excluding Current Maturities	8,020,873			6,896,971
Senior Notes 4.375 Percent due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000			500,000
Fair Value	$ 501,250			$ 507,500
Stated interest rate (as a percent)	4.375%	4.375%		4.375%	4.375%
Unamortized Debt Issuance Expense	$ (5,444)			$ (5,874)
Long-term Debt	494,556			494,126
Australian Dollar Term Loan [Member]
Debt Instrument [Line Items]
Debt Instrument, Unamortized Discount		$ 2,231			$ 1,545
Long-term Debt, Gross	259,431		$ 350,000	187,504			$ 250,000
Fair Value	261,662	$ 340,625		189,049
Unamortized Debt Issuance Expense	(3,761)			(3,382)
Long-term Debt	255,670			184,122
6% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000			600,000
Fair Value	$ 618,000			$ 625,500
Stated interest rate (as a percent)	6.00%	6.00%		6.00%	6.00%
Unamortized Debt Issuance Expense	$ (5,949)			$ (6,224)
Long-term Debt	594,051			593,776
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	193,826			199,171
Fair Value	$ 196,482			$ 208,631
Stated interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
Unamortized Debt Issuance Expense	$ (3,067)			$ (3,295)
Long-term Debt	190,759			195,876
The 5 3/4% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000			1,000,000
Fair Value	$ 970,000			$ 1,012,500
Stated interest rate (as a percent)	5.75%	5.75%		5.75%	5.75%
Unamortized Debt Issuance Expense	$ (8,812)			$ (9,156)
Long-term Debt	991,188			990,844
Euro Notes 3 Percent due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	369,711			359,386
Fair Value	$ 366,014			$ 364,776
Stated interest rate (as a percent)	3.00%	3.00%		3.00%	3.00%
Unamortized Debt Issuance Expense	$ (4,567)			$ (4,691)
Long-term Debt	365,144			354,695
GBP Notes due 2025 3.875 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	560,516			539,702
Fair Value	$ 529,789			$ 527,559
Stated interest rate (as a percent)	3.875%	3.875%		3.875%	3.875%
Unamortized Debt Issuance Expense	$ (7,758)			$ (7,718)
Long-term Debt	552,758			531,984
Senior Notes 5.375 Percent due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	250,000			250,000
Fair Value	$ 240,313			$ 256,875
Stated interest rate (as a percent)	5.375%	5.375%		5.375%	5.375%
Unamortized Debt Issuance Expense	$ (3,508)			$ (3,615)
Long-term Debt	246,492			246,385
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000			1,000,000
Fair Value	$ 927,500			$ 1,000,000
Stated interest rate (as a percent)	4.875%	4.875%		4.875%	4.875%
Unamortized Debt Issuance Expense	$ (13,509)			$ (13,866)
Long-term Debt	986,491			986,134
Senior Notes due 2028 5.25 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	825,000			825,000
Fair Value	$ 773,438			$ 826,031
Stated interest rate (as a percent)	5.25%	5.25%		5.25%	5.25%
Unamortized Debt Issuance Expense	$ (11,817)			$ (11,817)
Long-term Debt	813,183			813,183
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Long-term Debt, Gross	272,273			258,973
Fair Value	272,273			258,973
Unamortized Debt Issuance Expense	(321)			(356)
Long-term Debt	271,952			258,617
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Long-term Debt, Gross	630,868			649,432
Fair Value	630,868			649,432
Unamortized Debt Issuance Expense	(451)			(566)
Long-term Debt	630,417			648,866
Mortgage Securitization Program [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	50,000			50,000
Fair Value	50,000			50,000
Unamortized Debt Issuance Expense	(1,237)			(1,273)
Long-term Debt	48,763			48,727
New Credit Agreement | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross						$ 250,000
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	800,158			466,593
Fair Value	800,158			466,593
Unamortized Debt Issuance Expense	(13,688)			(14,407)
Long-term Debt	786,470			452,186
Term Loan A [Member] | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	240,625			243,750
Fair Value	240,625			243,750
Unamortized Debt Issuance Expense	0			0
Long-term Debt	240,625			243,750
Term Loan B [Member] | Term Loan Facility
Debt Instrument [Line Items]
Long-term Debt, Gross	698,250			0
Fair Value	700,000			0
Unamortized Debt Issuance Expense	(8,698)			0
Long-term Debt	$ 689,552			$ 0

Debt (Details)

Debt (Details) € in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Mar. 29, 2018USD ($)	Mar. 29, 2018AUD ($)	Mar. 27, 2018AUD ($)	Mar. 22, 2018USD ($)	Aug. 21, 2017USD ($)	Sep. 28, 2016AUD ($)	Mar. 31, 2018USD ($)	Dec. 31, 2017USD ($)	Mar. 31, 2018AUD ($)	Mar. 31, 2018EUR (€)	Mar. 31, 2018CAD ($)	Mar. 26, 2018	Dec. 31, 2017AUD ($)	Jul. 31, 2017USD ($)
Debt
Capital stock of subsidiaries pledged to secure debt (as a percent)							66.00%		66.00%	66.00%	66.00%
Debt covenants
Long-term Debt, Gross							$ 8,250,658	$ 7,129,511
Long-term Debt							$ 8,158,071	7,043,271
Number Of Cash Pools							2		2	2	2
New Credit Agreement
Debt
Average interest rate (as a percent)							3.30%		3.30%	3.30%	3.30%
New Credit Agreement | Minimum
Debt
Commitment fee percentage							0.25%
New Credit Agreement | Maximum
Debt
Commitment fee percentage							0.40%
Revolving Credit Facility
Debt
Repayments of Debt								807,000
Accounts Receivable Securitization Program | Secured Debt
Debt
Maximum borrowing capacity														$ 275,000
Effective interest rate (as a percent)							2.90%		2.90%	2.90%	2.90%
Accounts Receivable from Securitization							$ 272,273
QRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position							2,600	5,700
Cash pool agreement, gross cash position							389,200	383,700
Cash pool agreement, outstanding borrowings							$ 386,600	378,000
Number Of Cash Pools Utilized To Manage Global Liquidity Requirements							1		1	1	1
TRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position							$ 18,900	0
Cash pool agreement, gross cash position							262,400	229,600
Cash pool agreement, outstanding borrowings							$ 243,500	$ 229,600
Credit Agreement
Debt
Capital stock of subsidiaries pledged to secure debt (as a percent)							66.00%		66.00%	66.00%	66.00%
Debt covenants
Net total lease adjusted leverage ratio							5.6	5	5.6	5.6	5.6		5
Net secured debt lease adjusted leverage ratio							2.4	1.6	2.4	2.4	2.4		1.6
Bond leverage ratio, per indentures							5.8	5.8	5.8	5.8	5.8		5.8
Fixed charge coverage ratio							2.2	2.1	2.2	2.2	2.2		2.1
Credit Agreement | Minimum
Debt covenants
Fixed charge coverage ratio							1.5		1.5	1.5	1.5
Credit Agreement | Maximum
Debt covenants
Net total lease adjusted leverage ratio							6.5		6.5	6.5	6.5
Net secured debt lease adjusted leverage ratio							4		4	4	4
Bond leverage ratio, per indentures							6.5		6.5	6.5	6.5
Revolving Credit Facility
Debt
Letters of credit outstanding							$ 54,673
Period of earnings before interest, taxes, depreciation, amortization and rent expense (EBITDAR) for calculation of remaining borrowing capacity							12 months
Remaining amount available for borrowing under credit facility							$ 895,169
Revolving Credit Facility | New Credit Agreement
Debt
Maximum borrowing capacity					$ 1,750,000
Optional additional commitments				$ 1,260,000
Average interest rate (as a percent)							3.30%		3.30%	3.30%	3.30%
Fair Value							$ 800,158	$ 466,593
Debt covenants
Long-term Debt, Gross							800,158	466,593
Long-term Debt							$ 786,470	452,186
Revolving Credit Facility | New Credit Agreement | Minimum
Debt
Effective interest rate (as a percent)							1.80%		1.80%	1.80%	1.80%
Revolving Credit Facility | New Credit Agreement | Maximum
Debt
Effective interest rate (as a percent)							5.50%		5.50%	5.50%	5.50%
Term Loan Facility | New Credit Agreement
Debt
Amount of quarterly installments based on the original principal (as a percentage)					3,125
Debt covenants
Long-term Debt, Gross					$ 250,000
Term Loan Facility | New Credit Agreement | USD
Debt covenants
Long-term Debt, Gross							$ 548,000
Term Loan Facility | New Credit Agreement | Canada, Dollars
Debt covenants
Long-term Debt, Gross											$ 179,000
Term Loan Facility | New Credit Agreement | EUR
Debt covenants
Long-term Debt, Gross | €										€ 92,000
Term Loan Facility | Term Loan A [Member]
Debt
Average interest rate (as a percent)							3.60%		3.60%	3.60%	3.60%
Fair Value							$ 240,625	243,750
Debt covenants
Long-term Debt, Gross							240,625	243,750
Long-term Debt							240,625	243,750
Term Loan Facility | Term Loan B [Member]
Debt
Fair Value							700,000	0
Debt covenants
Long-term Debt, Gross							698,250	0
Long-term Debt							$ 689,552	$ 0
Loans Payable [Member] | Term Loan B [Member] | Term Loan Facility
Debt
Maximum borrowing capacity				$ 700,000
Effective interest rate (as a percent)							3.60%		3.60%	3.60%	3.60%
Debt Instrument, Unamortized Discount							$ 1,750
Stated interest rate (as a percent)				1.75%
Debt covenants
Par percentage												99.75%
Proceeds from issuance of debt							$ 689,850
Principal payments				$ 1,750
Euro Notes 3 Percent due 2025 [Member]
Debt
Stated interest rate (as a percent)							3.00%	3.00%	3.00%	3.00%	3.00%		3.00%
Fair Value							$ 366,014	$ 364,776
Debt covenants
Long-term Debt, Gross							369,711	359,386
Long-term Debt							$ 365,144	$ 354,695
Senior Notes 4.875 Percent due 2027
Debt
Stated interest rate (as a percent)							4.875%	4.875%	4.875%	4.875%	4.875%		4.875%
Fair Value							$ 927,500	$ 1,000,000
Debt covenants
Long-term Debt, Gross							1,000,000	1,000,000
Long-term Debt							$ 986,491	$ 986,134
Senior Notes 5.375 Percent due 2026
Debt
Stated interest rate (as a percent)							5.375%	5.375%	5.375%	5.375%	5.375%		5.375%
Fair Value							$ 240,313	$ 256,875
Debt covenants
Long-term Debt, Gross							250,000	250,000
Long-term Debt							$ 246,492	$ 246,385
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt
Stated interest rate (as a percent)							5.375%	5.375%	5.375%	5.375%	5.375%		5.375%
Fair Value							$ 196,482	$ 208,631
Debt covenants
Long-term Debt, Gross							193,826	199,171
Long-term Debt							$ 190,759	195,876
Australian Dollar Term Loan [Member]
Debt
Amount of quarterly installments based on the original principal (as a percentage)			$ 8,750			$ 6,250
Effective interest rate (as a percent)							5.90%		5.90%	5.90%	5.90%
Debt Instrument, Unamortized Discount									$ 2,231				$ 1,545
Fair Value							$ 261,662	189,049	$ 340,625
Debt covenants
Long-term Debt, Gross			$ 350,000			$ 250,000	259,431	187,504
Par percentage						99.00%
Net proceeds from sales of senior notes	$ 75,621	$ 99,000
Long-term Debt							$ 255,670	$ 184,122
Australian Dollar Term Loan [Member] | BBSY
Debt covenants
Basis spread on variable rate			3.90%			4.30%

Debt Covenant Ratios (Details)

Debt Covenant Ratios (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017USD ($)	Mar. 31, 2018
Credit Agreement
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	5	5.6
Net secured debt lease adjusted leverage ratio	1.6	2.4
Bond leverage ratio, per indentures	5.8	5.8
Fixed charge coverage ratio	2.1	2.2
Credit Agreement | Maximum
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio		6.5
Net secured debt lease adjusted leverage ratio		4
Bond leverage ratio, per indentures		6.5
Credit Agreement | Minimum
Debt Instrument [Line Items]
Fixed charge coverage ratio		1.5
Senior Notes 4.875 Percent due 2027, GBP Notes due 2025 and 5.25 Percent Notes [Member]
Debt Instrument [Line Items]
Debt Instrument Covenant, Indenture, Leverage Ratio Maximum		7
Revolving Credit Facility
Debt Instrument [Line Items]
Repayments of Debt	$ 807,000

Selected Consolidated Financi59

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017	Mar. 31, 2017	Dec. 31, 2016
Current Assets:
Cash and Cash Equivalents	$ 442,491	$ 925,699	$ 295,628	$ 236,484
Accounts Receivable	859,106	835,742
Intercompany Receivable	0	0
Other Current Assets	223,276	188,874
Total Current Assets	1,524,873	1,950,315
Property, Plant and Equipment, Net	4,365,471	3,417,679
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0	0
Investment in Subsidiaries	0	0
Goodwill	4,325,478	4,070,267
Other	1,782,327	1,534,141
Total Other Assets, Net	6,107,805	5,604,408
Total Assets	11,998,149	10,972,402	9,672,134
Liabilities and Equity
Intercompany Payable	0	0
Debit Balances Under Cash Pools	0	0
Current Portion of Long-term Debt	137,198	146,300
Total Other Current Liabilities	1,093,864	1,183,873
Long-term Debt, Net of Current Portion	8,020,873	6,896,971
Long-term Notes Payable to Affiliates and Intercompany Payable	0	0
Other Long-term Liabilities	392,062	354,998
Redeemable Noncontrolling Interest	92,877	91,418
Total Iron Mountain Incorporated Stockholders' Equity	2,259,747	2,297,438
Noncontrolling Interests	1,528	1,404
Total Equity	2,261,275	2,298,842	1,903,774	1,936,671
Total Liabilities and Equity	11,998,149	10,972,402
Eliminations
Current Assets:
Cash and Cash Equivalents	(31,047)	(94,726)	(185,822)	0
Accounts Receivable	0	0
Intercompany Receivable	(254,508)	(482,024)
Other Current Assets	(29)	(29)
Total Current Assets	(285,584)	(576,779)
Property, Plant and Equipment, Net	0	0
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	(4,662,099)	(4,578,995)
Investment in Subsidiaries	(2,768,883)	(2,744,044)
Goodwill	0	0
Other	0	0
Total Other Assets, Net	(7,430,982)	(7,323,039)
Total Assets	(7,716,566)	(7,899,818)
Liabilities and Equity
Intercompany Payable	(254,508)	(482,024)
Debit Balances Under Cash Pools	(31,047)	(94,726)
Current Portion of Long-term Debt	(29)	(29)
Total Other Current Liabilities	0	0
Long-term Debt, Net of Current Portion	0	0
Long-term Notes Payable to Affiliates and Intercompany Payable	(4,662,099)	(4,578,995)
Other Long-term Liabilities	0	0
Redeemable Noncontrolling Interest	0	0
Total Iron Mountain Incorporated Stockholders' Equity	(2,768,883)	(2,744,044)
Noncontrolling Interests	0	0
Total Equity	(2,768,883)	(2,744,044)
Total Liabilities and Equity	(7,716,566)	(7,899,818)
Parent | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	3,194	2,433	470	2,405
Accounts Receivable	0	0
Intercompany Receivable	172,289	332,293
Other Current Assets	0	1,579
Total Current Assets	175,483	336,305
Property, Plant and Equipment, Net	283	316
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	4,662,099	4,578,995
Investment in Subsidiaries	1,875,464	1,858,045
Goodwill	0	0
Other	0	0
Total Other Assets, Net	6,537,563	6,437,040
Total Assets	6,713,329	6,773,661
Liabilities and Equity
Intercompany Payable	0	0
Debit Balances Under Cash Pools	0	0
Current Portion of Long-term Debt	0	0
Total Other Current Liabilities	199,577	235,062
Long-term Debt, Net of Current Portion	4,244,612	4,232,759
Long-term Notes Payable to Affiliates and Intercompany Payable	0	0
Other Long-term Liabilities	185	0
Redeemable Noncontrolling Interest	9,208	8,402
Total Iron Mountain Incorporated Stockholders' Equity	2,259,747	2,297,438
Noncontrolling Interests	0	0
Total Equity	2,259,747	2,297,438
Total Liabilities and Equity	6,713,329	6,773,661
Guarantors
Other Assets, Net:
Deposits	45,600	38,400
Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	75,061	634,317	64,550	23,380
Accounts Receivable	28,731	32,972
Intercompany Receivable	82,219	149,731
Other Current Assets	125,373	103,643
Total Current Assets	311,384	920,663
Property, Plant and Equipment, Net	2,935,396	2,030,875
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0	0
Investment in Subsidiaries	893,419	885,999
Goodwill	2,813,151	2,577,310
Other	1,027,985	796,913
Total Other Assets, Net	4,734,555	4,260,222
Total Assets	7,981,335	7,211,760
Liabilities and Equity
Intercompany Payable	0	0
Debit Balances Under Cash Pools	4,287	56,233
Current Portion of Long-term Debt	60,778	54,247
Total Other Current Liabilities	487,627	527,549
Long-term Debt, Net of Current Portion	1,514,579	758,166
Long-term Notes Payable to Affiliates and Intercompany Payable	4,662,099	4,578,995
Other Long-term Liabilities	120,998	113,024
Redeemable Noncontrolling Interest	0	0
Total Iron Mountain Incorporated Stockholders' Equity	1,130,967	1,123,546
Noncontrolling Interests	0	0
Total Equity	1,130,967	1,123,546
Total Liabilities and Equity	7,981,335	7,211,760
Canada Company | Reportable legal entities
Current Assets:
Cash and Cash Equivalents			5,763	17,110
Non-Guarantor Subsidiaries including Canada Company [Member] | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	395,283	383,675
Accounts Receivable	830,375
Intercompany Receivable	0
Other Current Assets	97,932
Total Current Assets	1,323,590
Property, Plant and Equipment, Net	1,429,792
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0
Investment in Subsidiaries	0
Goodwill	1,512,327
Other	754,342
Total Other Assets, Net	2,266,669
Total Assets	5,020,051
Liabilities and Equity
Intercompany Payable	254,508
Debit Balances Under Cash Pools	26,760
Current Portion of Long-term Debt	76,449
Total Other Current Liabilities	406,660
Long-term Debt, Net of Current Portion	2,261,682
Long-term Notes Payable to Affiliates and Intercompany Payable	0
Other Long-term Liabilities	270,879
Redeemable Noncontrolling Interest	83,669
Total Iron Mountain Incorporated Stockholders' Equity	1,637,916
Noncontrolling Interests	1,528
Total Equity	1,639,444
Total Liabilities and Equity	5,020,051
Non-Guarantors
Other Assets, Net:
Deposits	$ 6,900	62,000
Non-Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents		383,675	$ 410,667	$ 193,589
Accounts Receivable		802,770
Intercompany Receivable		0
Other Current Assets		83,681
Total Current Assets		1,270,126
Property, Plant and Equipment, Net		1,386,488
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable		0
Investment in Subsidiaries		0
Goodwill		1,492,957
Other		737,228
Total Other Assets, Net		2,230,185
Total Assets		4,886,799
Liabilities and Equity
Intercompany Payable		482,024
Debit Balances Under Cash Pools		38,493
Current Portion of Long-term Debt		92,082
Total Other Current Liabilities		421,262
Long-term Debt, Net of Current Portion		1,906,046
Long-term Notes Payable to Affiliates and Intercompany Payable		0
Other Long-term Liabilities		241,974
Redeemable Noncontrolling Interest		83,016
Total Iron Mountain Incorporated Stockholders' Equity		1,620,498
Noncontrolling Interests		1,404
Total Equity		1,621,902
Total Liabilities and Equity		$ 4,886,799

Selected Consolidated Financi60

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Consolidating financial statements
Income (loss) from discontinued operations, net of tax	$ (462)	$ (337)
Revenues:
Storage Rental	651,149	572,279
Service	391,309	366,597
Intercompany Service	0	0
Total Revenues	1,042,458	938,876
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	448,721	426,707
Selling, General and Administrative	269,730	240,166
Intercompany Service Cost of Sales	0	0
Depreciation and Amortization	160,578	124,707
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	(1,130)	(459)
Total Operating Expenses	877,899	791,121
Operating Income (Loss)	164,559	147,755
Interest Expense (Income), Net	97,626	86,055
Other (Income) Expense, Net	20,151	(6,364)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	46,782	68,064
Provision (Benefit) for Income Taxes	1,168	9,220
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0
Income (Loss) from Continuing Operations	45,614	58,844
Net income (loss)	45,152	58,507
Less: Net Income (Loss) Attributable to Noncontrolling Interests	468	382
Net income (loss) attributable to Iron Mountain Incorporated	44,684	58,125
Net income (loss)	45,152	58,507
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	31,651	50,784
Change in Fair Value of Interest Rate Swap Agreements	(185)	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0
Total Other Comprehensive Income (Loss)	31,466	50,784
Comprehensive Income (Loss)	76,618	109,291
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	2,027	(168)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	74,591	109,459
Eliminations
Consolidating financial statements
Income (loss) from discontinued operations, net of tax	0	0
Revenues:
Storage Rental	0	0
Service	0	0
Intercompany Service	(5,696)	(23,439)
Total Revenues	(5,696)	(23,439)
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0
Selling, General and Administrative	0	0
Intercompany Service Cost of Sales	(5,696)	(23,439)
Depreciation and Amortization	0	0
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0
Total Operating Expenses	(5,696)	(23,439)
Operating Income (Loss)	0	0
Interest Expense (Income), Net	0	0
Other (Income) Expense, Net	0	0
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	0	0
Provision (Benefit) for Income Taxes	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	90,679	133,499
Income (Loss) from Continuing Operations	(90,679)	(133,499)
Net income (loss)	(90,679)	(133,499)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	(90,679)	(133,499)
Net income (loss)	(90,679)	(133,499)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	0
Change in Fair Value of Interest Rate Swap Agreements	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	(74,068)	(81,868)
Total Other Comprehensive Income (Loss)	(74,068)	(81,868)
Comprehensive Income (Loss)	(164,747)	(215,367)
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(164,747)	(215,367)
Parent | Reportable legal entities
Consolidating financial statements
Income (loss) from discontinued operations, net of tax	0	0
Revenues:
Storage Rental	0	0
Service	0	0
Intercompany Service	0	0
Total Revenues	0	0
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	0	0
Selling, General and Administrative	43	79
Intercompany Service Cost of Sales	0	0
Depreciation and Amortization	33	46
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	0	0
Total Operating Expenses	76	125
Operating Income (Loss)	(76)	(125)
Interest Expense (Income), Net	49,941	42,784
Other (Income) Expense, Net	(1,157)	81
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	(48,860)	(42,990)
Provision (Benefit) for Income Taxes	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(93,544)	(101,115)
Income (Loss) from Continuing Operations	44,684	58,125
Net income (loss)	44,684	58,125
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	44,684	58,125
Net income (loss)	44,684	58,125
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	(5,635)	(1,072)
Change in Fair Value of Interest Rate Swap Agreements	(185)
Equity in Other Comprehensive Income (Loss) of Subsidiaries	35,732	52,406
Total Other Comprehensive Income (Loss)	29,912	51,334
Comprehensive Income (Loss)	74,596	109,459
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	74,596	109,459
Guarantors | Reportable legal entities
Consolidating financial statements
Income (loss) from discontinued operations, net of tax	(422)	198
Revenues:
Storage Rental	396,476	349,351
Service	230,230	218,209
Intercompany Service	1,205	1,097
Total Revenues	627,911	568,657
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	246,163	239,329
Selling, General and Administrative	185,348	162,705
Intercompany Service Cost of Sales	4,491	6,606
Depreciation and Amortization	102,446	76,161
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	(356)	(548)
Total Operating Expenses	538,092	484,253
Operating Income (Loss)	89,819	84,404
Interest Expense (Income), Net	(1,508)	(3,279)
Other (Income) Expense, Net	1,560	2,519
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	89,767	85,164
Provision (Benefit) for Income Taxes	(6,712)	12,744
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	2,865	(23,413)
Income (Loss) from Continuing Operations	93,614	95,833
Net income (loss)	93,192	96,031
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	93,192	96,031
Net income (loss)	93,192	96,031
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	0	0
Change in Fair Value of Interest Rate Swap Agreements	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	38,336	28,540
Total Other Comprehensive Income (Loss)	38,336	28,540
Comprehensive Income (Loss)	131,528	124,571
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	131,528	124,571
Canada Company | Reportable legal entities
Consolidating financial statements
Income (loss) from discontinued operations, net of tax		0
Revenues:
Storage Rental		32,006
Service		16,050
Intercompany Service		0
Total Revenues		48,056
Operating Expenses:
Cost of sales (excluding depreciation and amortization)		7,550
Selling, General and Administrative		3,561
Intercompany Service Cost of Sales		15,736
Depreciation and Amortization		4,238
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net		2
Total Operating Expenses		31,087
Operating Income (Loss)		16,969
Interest Expense (Income), Net		11,670
Other (Income) Expense, Net		(27)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes		5,326
Provision (Benefit) for Income Taxes		(3,488)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax		(157)
Income (Loss) from Continuing Operations		8,971
Net income (loss)		8,971
Less: Net Income (Loss) Attributable to Noncontrolling Interests		0
Net income (loss) attributable to Iron Mountain Incorporated		8,971
Net income (loss)		8,971
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments		635
Equity in Other Comprehensive Income (Loss) of Subsidiaries		287
Total Other Comprehensive Income (Loss)		922
Comprehensive Income (Loss)		9,893
Comprehensive (Loss) Income Attributable to Noncontrolling Interests		0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated		9,893
Non-Guarantor Subsidiaries including Canada Company [Member] | Reportable legal entities
Consolidating financial statements
Income (loss) from discontinued operations, net of tax	(40)
Revenues:
Storage Rental	254,673
Service	161,079
Intercompany Service	4,491
Total Revenues	420,243
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	202,558
Selling, General and Administrative	84,339
Intercompany Service Cost of Sales	1,205
Depreciation and Amortization	58,099
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net	(774)
Total Operating Expenses	345,427
Operating Income (Loss)	74,816
Interest Expense (Income), Net	49,193
Other (Income) Expense, Net	19,748
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	5,875
Provision (Benefit) for Income Taxes	7,880
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0
Income (Loss) from Continuing Operations	(2,005)
Net income (loss)	(2,045)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	468
Net income (loss) attributable to Iron Mountain Incorporated	(2,513)
Net income (loss)	(2,045)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments	37,286
Change in Fair Value of Interest Rate Swap Agreements	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0
Total Other Comprehensive Income (Loss)	37,286
Comprehensive Income (Loss)	35,241
Comprehensive (Loss) Income Attributable to Noncontrolling Interests	2,027
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 33,214
Non-Guarantors | Reportable legal entities
Consolidating financial statements
Income (loss) from discontinued operations, net of tax		(535)
Revenues:
Storage Rental		190,922
Service		132,338
Intercompany Service		22,342
Total Revenues		345,602
Operating Expenses:
Cost of sales (excluding depreciation and amortization)		179,828
Selling, General and Administrative		73,821
Intercompany Service Cost of Sales		1,097
Depreciation and Amortization		44,262
Loss (Gain) on Disposal/Write-down of Property, Plant and Equipment (Excluding Real Estate), net		87
Total Operating Expenses		299,095
Operating Income (Loss)		46,507
Interest Expense (Income), Net		34,880
Other (Income) Expense, Net		(8,937)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes		20,564
Provision (Benefit) for Income Taxes		(36)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax		(8,814)
Income (Loss) from Continuing Operations		29,414
Net income (loss)		28,879
Less: Net Income (Loss) Attributable to Noncontrolling Interests		382
Net income (loss) attributable to Iron Mountain Incorporated		28,497
Net income (loss)		28,879
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustments		51,221
Equity in Other Comprehensive Income (Loss) of Subsidiaries		635
Total Other Comprehensive Income (Loss)		51,856
Comprehensive Income (Loss)		80,735
Comprehensive (Loss) Income Attributable to Noncontrolling Interests		(168)
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated		$ 80,903

Selected Consolidated Financi61

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Cash Flows (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	$ 91,568	$ 122,174
Cash Flows from Operating Activities—Discontinued Operations	0	(337)
Cash Flows from Operating Activities	91,568	121,837
Cash Flows from Investing Activities:
Capital expenditures	(95,605)	(73,202)
Cash paid for acquisitions, net of cash acquired	(1,428,974)	(12,187)
Intercompany loans to subsidiaries	0	0
Investment in subsidiaries	0	0
Acquisitions of customer relationships and customer inducements	18,046	21,403
Net proceeds from Divestments (see Note 10)	0	2,423
Proceeds from sales of property and equipment and other, net (including real estate)	(19,387)	66
Cash Flows from Investing Activities—Continuing Operations	(1,562,012)	(104,303)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(1,562,012)	(104,303)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	(4,410,656)	(2,682,348)
Proceeds from revolving credit, term loan and bridge facilities and other debt	5,496,491	2,714,783
Borrowings under cash pools	0	0
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	(561)	10,668
Intercompany loans from parent	0	0
Equity contribution from parent		0
Parent cash dividends	(169,006)	(2,060)
Net (payments) proceeds associated with employee stock-based awards	(5,950)	(4,308)
Net proceeds associated with the Over-Allotment Option (see Note 9)	76,192	0
Proceeds From Issuance Of At The Market Program	8,716	0
Payment of debt financing and stock issuance costs	(9,974)	(73)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	985,252	36,662
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	985,252	36,662
Effect of exchange rates on cash and cash equivalents	1,984	4,948
(Decrease) Increase in cash and cash equivalents	(483,208)	59,144
Cash and cash equivalents, beginning of period	925,699	236,484
Cash and cash equivalents, end of period	442,491	295,628
Eliminations
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	0	0
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	0	0
Cash Flows from Investing Activities:
Capital expenditures	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	(366,180)	74,472
Investment in subsidiaries	0	16,170
Acquisitions of customer relationships and customer inducements	0	0
Net proceeds from Divestments (see Note 10)		0
Proceeds from sales of property and equipment and other, net (including real estate)	0	0
Cash Flows from Investing Activities—Continuing Operations	(366,180)	90,642
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(366,180)	90,642
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	0	0
Proceeds from revolving credit, term loan and bridge facilities and other debt	0	0
Borrowings under cash pools	63,679	(185,822)
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	0	0
Intercompany loans from parent	366,180	(74,472)
Equity contribution from parent		(16,170)
Parent cash dividends	0	0
Net (payments) proceeds associated with employee stock-based awards	0	0
Net proceeds associated with the Over-Allotment Option (see Note 9)	0
Proceeds From Issuance Of At The Market Program	0
Payment of debt financing and stock issuance costs	0	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	429,859	(276,464)
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	429,859	(276,464)
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	63,679	(185,822)
Cash and cash equivalents, beginning of period	(94,726)	0
Cash and cash equivalents, end of period	(31,047)	(185,822)
Parent | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	(66,516)	(41,288)
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	(66,516)	(41,288)
Cash Flows from Investing Activities:
Capital expenditures	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	157,737	(1,187)
Investment in subsidiaries	0	(16,170)
Acquisitions of customer relationships and customer inducements	0	0
Net proceeds from Divestments (see Note 10)		0
Proceeds from sales of property and equipment and other, net (including real estate)	0	0
Cash Flows from Investing Activities—Continuing Operations	157,737	(17,357)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	157,737	(17,357)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	0	(31,733)
Proceeds from revolving credit, term loan and bridge facilities and other debt	0	94,811
Borrowings under cash pools	0	0
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	0	0
Intercompany loans from parent	0	0
Equity contribution from parent		0
Parent cash dividends	(169,006)	(2,060)
Net (payments) proceeds associated with employee stock-based awards	(5,950)	(4,308)
Net proceeds associated with the Over-Allotment Option (see Note 9)	76,192
Proceeds From Issuance Of At The Market Program	8,716
Payment of debt financing and stock issuance costs	(412)	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(90,460)	56,710
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	(90,460)	56,710
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	761	(1,935)
Cash and cash equivalents, beginning of period	2,433	2,405
Cash and cash equivalents, end of period	3,194	470
Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	96,674	136,411
Cash Flows from Operating Activities—Discontinued Operations	0	198
Cash Flows from Operating Activities	96,674	136,609
Cash Flows from Investing Activities:
Capital expenditures	(62,148)	(53,175)
Cash paid for acquisitions, net of cash acquired	(1,315,549)	(6,380)
Intercompany loans to subsidiaries	208,443	(72,807)
Investment in subsidiaries	0	0
Acquisitions of customer relationships and customer inducements	11,874	20,653
Net proceeds from Divestments (see Note 10)		0
Proceeds from sales of property and equipment and other, net (including real estate)	(19,466)	93
Cash Flows from Investing Activities—Continuing Operations	(1,200,594)	(152,922)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(1,200,594)	(152,922)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	(2,308,119)	(1,495,558)
Proceeds from revolving credit, term loan and bridge facilities and other debt	3,067,988	1,423,653
Borrowings under cash pools	(51,946)	138,693
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	0	0
Intercompany loans from parent	(154,184)	(9,305)
Equity contribution from parent		0
Parent cash dividends	0	0
Net (payments) proceeds associated with employee stock-based awards	0	0
Net proceeds associated with the Over-Allotment Option (see Note 9)	0
Proceeds From Issuance Of At The Market Program	0
Payment of debt financing and stock issuance costs	(9,075)	0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	544,664	57,483
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	544,664	57,483
Effect of exchange rates on cash and cash equivalents	0	0
(Decrease) Increase in cash and cash equivalents	(559,256)	41,170
Cash and cash equivalents, beginning of period	634,317	23,380
Cash and cash equivalents, end of period	75,061	64,550
Canada Company | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations		5,291
Cash Flows from Operating Activities—Discontinued Operations		(535)
Cash Flows from Operating Activities		4,756
Cash Flows from Investing Activities:
Capital expenditures		(2,555)
Cash paid for acquisitions, net of cash acquired		0
Intercompany loans to subsidiaries		0
Investment in subsidiaries		0
Acquisitions of customer relationships and customer inducements		271
Net proceeds from Divestments (see Note 10)		0
Proceeds from sales of property and equipment and other, net (including real estate)		2
Cash Flows from Investing Activities—Continuing Operations		(2,824)
Cash Flows from Investing Activities—Discontinued Operations		0
Cash Flows from Investing Activities		(2,824)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt		(71)
Proceeds from revolving credit, term loan and bridge facilities and other debt		0
Borrowings under cash pools		0
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net		0
Intercompany loans from parent		(12,680)
Equity contribution from parent		0
Parent cash dividends		0
Net (payments) proceeds associated with employee stock-based awards		0
Payment of debt financing and stock issuance costs		(73)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		(12,824)
Cash Flows from Financing Activities—Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities		(12,824)
Effect of exchange rates on cash and cash equivalents		(455)
(Decrease) Increase in cash and cash equivalents		(11,347)
Cash and cash equivalents, beginning of period		17,110
Cash and cash equivalents, end of period		5,763
Non-Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations		21,760
Cash Flows from Operating Activities—Discontinued Operations		0
Cash Flows from Operating Activities		21,760
Cash Flows from Investing Activities:
Capital expenditures		(17,472)
Cash paid for acquisitions, net of cash acquired		(5,807)
Intercompany loans to subsidiaries		(478)
Investment in subsidiaries		0
Acquisitions of customer relationships and customer inducements		479
Net proceeds from Divestments (see Note 10)		2,423
Proceeds from sales of property and equipment and other, net (including real estate)		(29)
Cash Flows from Investing Activities—Continuing Operations		(21,842)
Cash Flows from Investing Activities—Discontinued Operations		0
Cash Flows from Investing Activities		(21,842)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt		(1,154,986)
Proceeds from revolving credit, term loan and bridge facilities and other debt		1,196,319
Borrowings under cash pools		47,129
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net		10,668
Intercompany loans from parent		96,457
Equity contribution from parent		16,170
Parent cash dividends		0
Net (payments) proceeds associated with employee stock-based awards		0
Payment of debt financing and stock issuance costs		0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations		211,757
Cash Flows from Financing Activities—Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities		211,757
Effect of exchange rates on cash and cash equivalents		5,403
(Decrease) Increase in cash and cash equivalents		217,078
Cash and cash equivalents, beginning of period	383,675	193,589
Cash and cash equivalents, end of period		$ 410,667
Non-Guarantor Subsidiaries including Canada Company [Member] | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	61,410
Cash Flows from Operating Activities—Discontinued Operations	0
Cash Flows from Operating Activities	61,410
Cash Flows from Investing Activities:
Capital expenditures	(33,457)
Cash paid for acquisitions, net of cash acquired	(113,425)
Intercompany loans to subsidiaries	0
Investment in subsidiaries	0
Acquisitions of customer relationships and customer inducements	6,172
Proceeds from sales of property and equipment and other, net (including real estate)	79
Cash Flows from Investing Activities—Continuing Operations	(152,975)
Cash Flows from Investing Activities—Discontinued Operations	0
Cash Flows from Investing Activities	(152,975)
Cash Flows from Financing Activities:
Repayment of revolving credit, term loan and bridge facilities and other debt	(2,102,537)
Proceeds from revolving credit, term loan and bridge facilities and other debt	2,428,503
Borrowings under cash pools	(11,733)
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	(561)
Intercompany loans from parent	(211,996)
Parent cash dividends	0
Net (payments) proceeds associated with employee stock-based awards	0
Net proceeds associated with the Over-Allotment Option (see Note 9)	0
Proceeds From Issuance Of At The Market Program	0
Payment of debt financing and stock issuance costs	(487)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	101,189
Cash Flows from Financing Activities—Discontinued Operations	0
Net Cash Provided by (Used in) Financing Activities	101,189
Effect of exchange rates on cash and cash equivalents	1,984
(Decrease) Increase in cash and cash equivalents	11,608
Cash and cash equivalents, beginning of period	383,675
Cash and cash equivalents, end of period	$ 395,283

Segment Information - Additiona

Segment Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2017segment
Segment Reporting [Abstract]
Number of operating segments	6

Segment Information - Segment R

Segment Information - Segment Reporting Information by Segment (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017	Dec. 31, 2017
Segment information
Total Revenues	$ 1,042,458	$ 938,876
Storage rental	651,149	572,279
Service	391,309	366,597
Depreciation and Amortization	160,578	124,707
Depreciation	113,432	99,592
Amortization	47,146	25,115
Adjusted EBITDA	343,015	292,574
Assets	11,998,149	9,672,134	$ 10,972,402
Expenditures for Segment Assets	1,542,625	106,792
Capital Expenditures	95,605	73,202
Cash Paid for Acquisitions, Net of Cash Acquired	1,428,974	12,187
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	18,046
Acquisitions of customer relationships and customer inducements	18,046	21,403
North American Records and Information Management business
Segment information
Total Revenues	526,843	507,597
Storage rental	304,819	298,183
Service	222,024	209,414
Depreciation and Amortization	62,752	60,535
Depreciation	49,138	51,952
Amortization	13,614	8,583
Adjusted EBITDA	225,738	209,530
Assets	5,030,238	5,016,658
Expenditures for Segment Assets	43,181	51,888
Capital Expenditures	29,870	26,578
Cash Paid for Acquisitions, Net of Cash Acquired	1,551	4,379
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	11,760
Acquisitions of customer relationships and customer inducements		20,931
North American Data Management Business
Segment information
Total Revenues	99,964	100,834
Storage rental	69,246	68,824
Service	30,718	32,010
Depreciation and Amortization	10,104	8,251
Depreciation	8,023	6,063
Amortization	2,081	2,188
Adjusted EBITDA	53,852	55,270
Assets	833,690	828,760
Expenditures for Segment Assets	6,853	7,906
Capital Expenditures	6,853	7,906
Cash Paid for Acquisitions, Net of Cash Acquired	0	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0
Acquisitions of customer relationships and customer inducements		0
Western European Business
Segment information
Total Revenues	136,872	120,072
Storage rental	83,952	71,567
Service	52,920	48,505
Depreciation and Amortization	17,770	14,297
Depreciation	12,905	10,888
Amortization	4,865	3,409
Adjusted EBITDA	44,082	34,142
Assets	929,402	918,246
Expenditures for Segment Assets	7,584	5,025
Capital Expenditures	6,151	4,898
Cash Paid for Acquisitions, Net of Cash Acquired	0	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	1,433
Acquisitions of customer relationships and customer inducements		127
Other International Business
Segment information
Total Revenues	207,970	189,241
Storage rental	131,747	117,615
Service	76,223	71,626
Depreciation and Amortization	31,659	27,676
Depreciation	18,917	19,305
Amortization	12,742	8,371
Adjusted EBITDA	60,631	55,347
Assets	2,429,438	2,133,593
Expenditures for Segment Assets	32,056	18,620
Capital Expenditures	25,038	12,467
Cash Paid for Acquisitions, Net of Cash Acquired	3,208	5,808
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	3,810
Acquisitions of customer relationships and customer inducements		345
Global Data Center Business [Member]
Segment information
Total Revenues	46,603	6,223
Storage rental	45,495	5,858
Service	1,108	365
Depreciation and Amortization	22,268	1,424
Depreciation	11,380	1,360
Amortization	10,888	64
Adjusted EBITDA	20,790	1,506
Assets	1,875,766	186,440
Expenditures for Segment Assets	1,438,012	8,895
Capital Expenditures	13,111	8,895
Cash Paid for Acquisitions, Net of Cash Acquired	1,424,215	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	686
Acquisitions of customer relationships and customer inducements		0
Corporate and Other
Segment information
Total Revenues	24,206	14,909
Storage rental	15,890	10,232
Service	8,316	4,677
Depreciation and Amortization	16,025	12,524
Depreciation	13,069	10,024
Amortization	2,956	2,500
Adjusted EBITDA	(62,078)	(63,221)
Assets	899,615	588,437
Expenditures for Segment Assets	14,939	14,458
Capital Expenditures	14,582	12,458
Cash Paid for Acquisitions, Net of Cash Acquired	0	2,000
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	$ 357
Acquisitions of customer relationships and customer inducements		$ 0

Segment Information - Reconcili

Segment Information - Reconciliation to Income from Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Reconciliation of Adjusted EBITDA to income from continuing operations
Adjusted EBITDA	$ 343,015	$ 292,574
Provision (Benefit) for Income Taxes	1,168	9,220
Less: Depreciation and Amortization	160,578	124,707
(Gain) Loss on disposal/write-down of property, plant and equipment (excluding real estate), net	(1,130)	(459)
Income (Loss) from Continuing Operations	45,614	58,844
Interest Expense (Income), Net	97,626	86,055
Other (Income) Expense, Net	20,151	(6,364)
Recall Transaction and IODC Transaction [Member]
Reconciliation of Adjusted EBITDA to income from continuing operations
Recall Costs	$ 19,008	$ 20,571

Commitments and Contingencies (

Commitments and Contingencies (Details) € in Thousands, $ in Thousands	1 Months Ended	3 Months Ended
	Sep. 30, 2017facility	Mar. 31, 2018USD ($)customerlawsuitclaim	Mar. 31, 2018EUR (€)customerlawsuitclaim	Jan. 31, 2015customerbox
Buenos Aires, Argentina
Commitments and Contingencies
Maximum facility revenue as a percentage of consolidated revenues		0.50%	0.50%
Insurance Settlement
Commitments and Contingencies
Reasonably possible additional losses | $		$ 21,500
Italy Fire
Commitments and Contingencies
Number of customer lawsuits | customer		6	6
Number of customer lawsuits settled | lawsuit		4	4
Loss Contingency, Pending Claims, Number | lawsuit		2	2
Loss Contingency, Damages Sought, Value | €			€ 42,600
Brooklyn Fire
Commitments and Contingencies
Loss Contingency, Pending Claims, Number | claim		2	2
Loss Contingency, Number Customer-Owned Items Lost | box				900,000
Loss Contingency, Number Of Customers Impacted | customer				1,200
PUERTO RICO
Commitments and Contingencies
Number of facilities	4
Percentage of consolidated revenue		0.50%	0.50%
Hurricane Maria | PUERTO RICO
Commitments and Contingencies
Number of facilities affected by natural disaster	2
Number of facilities owned	1
Number of facilities leased	1

Stockholders' Equity Matters -

Stockholders' Equity Matters - Dividends Declared (Details) $ / shares in Units, $ in Thousands	Apr. 02, 2018USD ($)	Feb. 14, 2018$ / shares	Jan. 02, 2018USD ($)	Dec. 12, 2017USD ($)bank$ / sharesshares	Oct. 24, 2017$ / shares	Oct. 02, 2017USD ($)	Jul. 27, 2017$ / shares	Jul. 03, 2017USD ($)	May 24, 2017$ / shares	Apr. 03, 2017USD ($)	Feb. 15, 2017$ / shares	Mar. 31, 2018USD ($)$ / sharesshares	Mar. 31, 2017USD ($)$ / shares	Dec. 31, 2017$ / sharesshares	Oct. 31, 2017USD ($)
Subsequent Event [Line Items]
Dividends Declared per Common Share (in dollars per share) | $ / shares		$ 0.5875			$ 0.5875		$ 0.55		$ 0.55		$ 0.55	$ 0.5888	$ 0.5504
Dividends, Common Stock			$ 166,319			$ 146,772		$ 145,417		$ 145,235		$ 169,044	$ 145,427
Common stock, issued shares | shares												285,923,405		283,110,183
Common Stock, Par or Stated Value Per Share | $ / shares												$ 0.01		$ 0.01
Subsequent Event
Subsequent Event [Line Items]
Dividends, Common Stock	$ 167,969
At The Market (ATM) Equity Program [Member]
Subsequent Event [Line Items]
Sale of Stock, Authorized Amount															$ 500,000
Common stock, issued shares | shares												273,486
Sale Of Stock Consideration Received On Transaction, Gross												$ 8,800
Sale of Stock, Consideration Received on Transaction												8,716
Payment of Stock Trading Commission Costs												90
Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution												$ 431,200
Equity Offering [Member]
Subsequent Event [Line Items]
Sale of Stock, Consideration Received on Transaction				$ 516,462
Number Of Banks | bank				16
Sale of Stock, Number of Shares Issued in Transaction | shares				14,500,000
Common Stock, Par or Stated Value Per Share | $ / shares				$ 37
Payments of Stock Issuance Costs Per Share | $ / shares				$ 1.38195
Over-Allotment Option [Member]
Subsequent Event [Line Items]
Sale of Stock, Consideration Received on Transaction			$ 76,200
Sale of Stock, Number of Shares Issued in Transaction | shares				2,175,000

Divestments - (Details)

Divestments - (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Cash proceeds from divestment	$ 0	$ 2,423
Income (loss) from discontinued operations, net of tax	(462)	(337)
Recall Divestments [Member] | Discontinued Operations, Disposed of by Sale
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations Before Provision (Benefit) for Income Taxes	(496)	(429)
Discontinued Operation, Tax Effect of Discontinued Operation	(34)	(92)
Income (loss) from discontinued operations, net of tax	$ (462)	$ (337)

Divestments - Results of Operat

Divestments - Results of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Income (Loss) from Discontinued Operations, Net of Tax	$ (462)	$ (337)

Significant Acquisition Costs69

Significant Acquisition Costs (Details) - USD ($) $ in Thousands	3 Months Ended	39 Months Ended
	Mar. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Recall Holdings Limited [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Restructuring Reserve	$ 7,878	$ 7,878	$ 12,622
Restructuring Accruals	1,038
Restructuring Reserve, Accrual Adjustment	0
Payments for Restructuring	(5,867)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	85
Recall Transaction and IODC Transaction [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Business Combination Separately Recognized Transactions Additional Disclosures, Expected Acquisition Costs	395,000	395,000
Cumulative operating and capital expenditures		334,648
Significant acquisition costs	$ 282,867	282,867
Capital expenditures		$ 51,781

Significant Acquisition Costs S

Significant Acquisition Costs Significant Acquisition Costs Included in Statements of Operations (Details) - Recall Transaction and IODC Transaction [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 19,008	$ 20,571
Cost of sales (excluding depreciation and amortization)
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	296	7,887
Selling, general and administrative expenses
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 18,712	$ 12,684

Significant Acquisition Costs71

Significant Acquisition Costs Significant Acquisition Costs by Segment (Details) - Recall Transaction and IODC Transaction [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 19,008	$ 20,571
North American Records and Information Management business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	584	7,299
North American Data Management Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	0	745
Western European Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	2,152	3,216
Other International Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	537	1,651
Global Data Center Business [Member]
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	10,181	0
Corporate and Other
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 5,554	$ 7,660