Iron Mountain (IRM) 10-Q 25 Apr 19 2019 Q1 Quarterly report Financial data

Document and Entity Information

Document and Entity Information - shares	3 Months Ended
	Mar. 31, 2019	Apr. 19, 2019
Document and Entity Information
Entity Registrant Name	IRON MOUNTAIN INC
Entity Central Index Key	0001020569
Document Type	10-Q
Document Period End Date	Mar. 31, 2019
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		286,880,641
Document Fiscal Year Focus	2019
Document Fiscal Period Focus	Q1
Entity Emerging Growth Company	false
Entity Small Business	false

CONSOLIDATED BALANCE SHEETS

CONSOLIDATED BALANCE SHEETS - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Current Assets:
Cash and cash equivalents	$ 161,475	$ 165,485
Accounts receivable (less allowances of $42,074 and $43,584 as of March 31, 2019 and December 31, 2018, respectively)	837,521	846,889
Prepaid expenses and other	210,854	195,740
Total Current Assets	1,209,850	1,208,114
Property, Plant and Equipment:
Property, plant and equipment	7,738,705	7,600,949
Less—Accumulated depreciation	(3,213,122)	(3,111,392)
Property, Plant and Equipment, Net	4,525,583	4,489,557
Other Assets, Net:
Goodwill	4,465,378	4,441,030
Customer relationships, customer inducements and data center lease-based intangibles	1,495,338	1,506,522
Operating lease right-of-use assets (see Note 2.d.)	1,791,536
Other	201,678	207,024
Total Other Assets, Net	7,953,930	6,154,576
Total Assets	13,689,363	11,852,247
Current Liabilities:
Current portion of long-term debt	125,142	126,406
Accounts payable	283,709	318,765
Accrued expenses and other current liabilities (includes current portion of operating lease liabilities, see Note 2.d.)	839,968	752,684
Deferred revenue	266,314	264,823
Total Current Liabilities	1,515,133	1,462,678
Long-term Debt, net of current portion	8,365,737	8,016,417
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)	1,656,659
Other Long-term Liabilities	127,127	111,331
Deferred Rent (see Note 2.d.)	0	121,864
Deferred Income Taxes	190,871	183,836
Commitments and Contingencies (see Note 7)
Redeemable Noncontrolling Interest	73,102	70,532
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 286,829,854 and 286,321,009 shares as of March 31, 2019 and December 31, 2018, respectively)	2,868	2,863
Additional paid-in capital	4,264,978	4,263,348
(Distributions in excess of earnings) Earnings in excess of distributions	(2,257,485)	(2,116,367)
Accumulated other comprehensive items, net	(250,960)	(265,664)
Total Iron Mountain Incorporated Stockholders' Equity	1,759,401	1,884,180
Noncontrolling Interests	1,333	1,409
Total Equity	1,760,734	1,885,589
Total Liabilities and Equity	$ 13,689,363	$ 11,852,247

CONSOLIDATED BALANCE SHEETS (Pa

CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Statement of Financial Position [Abstract]
Accounts receivable, allowances (in dollars)	$ 42,074	$ 43,584
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	286,829,854	286,321,009
Common stock, outstanding shares	286,829,854	286,321,009

CONSOLIDATED STATEMENTS OF OPER

CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Revenues:
Revenues	$ 1,053,863	$ 1,042,458
Operating Expenses:
Cost of sales (excluding depreciation and amortization)	461,544	448,721
Selling, general and administrative	270,559	269,730
Depreciation and amortization	162,483	160,578
Loss (Gain) on disposal/write-down of property, plant and equipment, net (see Note 2.l.)	602	(1,130)
Total Operating Expenses	895,188	877,899
Operating Income (Loss)	158,675	164,559
Interest Expense (Income), Net	102,436	97,626
Other Expense (Income), Net	15,210	20,151
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	41,029	46,782
Provision (Benefit) for Income Taxes	10,553	1,168
Income (Loss) from Continuing Operations	30,476	45,614
Income (loss) from discontinued operations, net of tax	(24)	(462)
Net income (loss)	30,452	45,152
Less: Net Income (Loss) Attributable to Noncontrolling Interests	891	468
Net Income (Loss) Attributable to Iron Mountain Incorporated	$ 29,561	$ 44,684
Earnings (Losses) per Share—Basic:
Income (Loss) from Continuing Operations	$ 0.10	$ 0.16
Total (Loss) Income from Discontinued Operations, Net of Tax, per Basic Share	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated	0.10	0.16
Earnings (Losses) per Share-Diluted:
Income (Loss) from Continuing Operations	0.10	0.16
Total (Loss) Income from Discontinued Operations, Net of Tax	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated	$ 0.10	$ 0.16
Weighted Average Common Shares Outstanding-Basic (in shares)	286,528,000	285,259,000
Weighted Average Common Shares Outstanding-Diluted (in shares)	287,491,823	285,992,878
Storage rental
Revenues:
Revenues	$ 662,974	$ 651,149
Service
Revenues:
Revenues	$ 390,889	$ 391,309

CONSOLIDATED STATEMENTS OF OP_2

CONSOLIDATED STATEMENTS OF OPERATIONS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income Statement [Abstract]
Interest Income	$ 1,785	$ 1,386

CONSOLIDATED STATEMENTS OF COMP

CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (LOSS) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Comprehensive Income [Abstract]
Net Income (Loss)	$ 30,452	$ 45,152
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	18,191	31,651
Change in Fair Value of Interest Rate Swap Agreements	(2,674)	(185)
Total Other Comprehensive Income (Loss)	15,517	31,466
Comprehensive Income (Loss)	45,969	76,618
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1,704	2,027
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	$ 44,265	$ 74,591

CONDENSED CONSOLIDATED STATEMEN

CONDENSED 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	Over-Allotment Option [Member]	Over-Allotment Option [Member]Common Stock	Over-Allotment Option [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
Balance (in shares) at Dec. 31, 2017		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
Change in value of redeemable noncontrolling interests			(117)
Issuance of shares								$ 76,192	$ 22	$ 76,170	$ 8,716	$ 2	$ 8,714
Issuance of shares (in shares)									2,175,000			273,486
Change in value of redeemable noncontrolling interests	(117)						$ 117
Parent cash dividends declared	(169,044)			(169,044)
Foreign currency translation adjustment	30,246				30,092	154
Change in Fair Value of Interest Rate Swap Agreements	(185)				(185)
Net income (loss)	45,152			44,684		(30)
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	44,654
Noncontrolling interests dividends	0
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
Redeemable Noncontrolling Interest at Dec. 31, 2017							91,418
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Foreign Currency Translation Adjustments							1,405
Temporary Equity, Net Income							498
Temporary Equity, Accretion of Dividends							(561)
Redeemable Noncontrolling Interest at Mar. 31, 2018							92,877
Balance (in shares) at Dec. 31, 2018	286,321,009	286,321,009
Balance at Dec. 31, 2018	$ 1,885,589	$ 2,863	4,263,348	(2,116,367)	(265,664)	1,409
Increase (Decrease) in Stockholders' Equity
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation (in shares)		508,845
Issuance of shares under employee stock purchase plan and option plans and stock-based compensation	2,923	$ 5	2,918
Change in value of redeemable noncontrolling interests	(1,288)		(1,288)				1,288
Parent cash dividends declared	(176,460)			(176,460)
Foreign currency translation adjustment	17,378				17,378	0
Change in Fair Value of Interest Rate Swap Agreements	(2,674)				(2,674)
Net income (loss)	30,452
Net Income (Loss), Including Portion Attributable to Nonredeemable Noncontrolling Interest	29,485			29,561		(76)
Noncontrolling interests dividends	0
Balance at Mar. 31, 2019	$ 1,760,734	$ 2,868	$ 4,264,978	(2,257,485)	$ (250,960)	$ 1,333
Balance (in shares) at Mar. 31, 2019	286,829,854	286,829,854
Redeemable Noncontrolling Interest at Dec. 31, 2018	$ 70,532						70,532
Increase (Decrease) in Temporary Equity [Roll Forward]
Temporary Equity, Foreign Currency Translation Adjustments							813
Temporary Equity, Net Income							967
Temporary Equity, Accretion of Dividends							(498)
Redeemable Noncontrolling Interest at Mar. 31, 2019	73,102						$ 73,102
Increase (Decrease) in Stockholders' Equity
Cumulative-effect adjustment for adoption of ASU 2014-09 (see Note 2.c.) | Accounting Standards Update 2016-02 [Member]	$ 5,781			$ 5,781

CONSOLIDATED STATEMENTS OF CASH

CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Cash Flows from Operating Activities:
Net income (loss)	$ 30,452	$ 45,152
Loss (income) from discontinued operations	24	462
Adjustments to reconcile net income (loss) to cash flows from operating activities:
Depreciation	114,611	113,432
Amortization (includes amortization of deferred financing costs and discounts of $4,108 and $3,553 for the three months ended March 31, 2019 and 2018, respectively)	51,980	50,699
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	3,645	3,664
Stock-based compensation expense	8,519	7,384
Provision (benefit) for deferred income taxes	1,423	(387)
Loss (gain) on disposal/write-down of property, plant and equipment, net (see Note 2.l.)	(602)	1,130
Foreign currency transactions and other, net	11,707	23,530
(Increase) decrease in assets	(33,138)	(74,884)
(Decrease) increase in liabilities	(72,758)	(76,354)
Cash Flows from Operating Activities - Continuing Operations	117,067	91,568
Cash Flows from Operating Activities - Discontinued Operations	0	0
Cash Flows from Operating Activities	117,067	91,568
Cash Flows from Investing Activities:
Capital expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	(184,765)	(95,605)
Cash paid for acquisitions, net of cash acquired	(39,423)	(1,428,974)
Acquisition of customer relationships	(23,934)	(12,602)
Customer inducements	(2,817)	(130)
Contract fulfillment costs and third-party commissions	(41,161)	(5,314)
Investments in joint ventures (see Note 9)	(19,222)	0
Proceeds from sales of property and equipment and other, net	105	(19,387)
Cash Flows from Investing Activities—Continuing Operations	(311,217)	(1,562,012)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(311,217)	(1,562,012)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(1,351,242)	(4,410,656)
Proceeds from revolving credit facility, term loan facilities and other debt	1,723,462	5,496,491
Debt repayment and equity distribution to noncontrolling interests	(498)	(561)
Parent cash dividends	(178,023)	(169,006)
Net proceeds associated with the Over-Allotment Option	0	76,192
Net proceeds associated with the At the Market (ATM) Program	0	8,716
Net (payments) proceeds associated with employee stock-based awards	(5,963)	(5,950)
Payment of debt financing and stock issuance costs	0	(9,974)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	187,736	985,252
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	187,736	985,252
Effect of Exchange Rates on Cash and Cash Equivalents	2,404	1,984
Increase (Decrease) in cash and cash equivalents	(4,010)	(483,208)
Cash and cash equivalents, including Restricted Cash, beginning of period	165,485	925,699
Cash and cash equivalents, including Restricted Cash, end of period	161,475	442,491
Supplemental Information:
Cash Paid for Interest	136,667	122,027
Cash Paid for Income Taxes, Net	15,141	22,292
Non-Cash Investing and Financing Activities:
Financing Leases (see Note 2.d.)	7,523	13,877
Accrued Capital Expenditures	75,824	36,760
Accrued Purchase Price and Other Holdbacks	1,042	149
Dividends Payable	$ 180,422	$ 172,140

CONSOLIDATED STATEMENTS OF CA_2

CONSOLIDATED STATEMENTS OF CASH FLOWS (Parenthetical) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Statement of Cash Flows [Abstract]
Deferred financing costs and discount included in Amortization	$ 4,108	$ 3,553

General

General	3 Months Ended
	Mar. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]
General	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") provide storage of physical records and data backup media, information management solutions and enterprise-class colocation and wholesale data center space that help organizations in various locations throughout North America, Europe, Latin America, Asia and Africa. We offer comprehensive records and information management services and data management services, along with the expertise and experience to address complex storage and information management challenges such as rising storage rental costs, legal and regulatory compliance and disaster recovery requirements. We provide secure and reliable data center facilities to protect digital information and ensure the continued operation of our customers’ information technology infrastructure, with flexible deployment options, including both colocation and wholesale space. 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, 2018 included in our Annual Report on Form 10-K filed with the SEC on February 14, 2019 (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 10, 2018, we completed the acquisition of IO Data Centers, LLC ("IODC") (the "IODC Transaction"). See Note 3. On January 1, 2019, we adopted Accounting Standards Update ("ASU") No. 2016-02, Leases (Topic 842), as amended ("ASU 2016-02"). See Note 2.d.

Summary of Significant Accounti

Summary of Significant Accounting Policies	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Cash and Cash Equivalents	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 March 31, 2019 and December 31, 2018, we had approximately $15,250 and $15,141 , respectively, of restricted cash held by certain financial institutions related to bank guarantees. b. Goodwill and Other Intangible Assets and Liabilities Goodwill Since December 31, 2018, there have been no changes to our accounting polices related to the accounting for goodwill. As of March 31, 2019 and December 31, 2018 , no factors were identified that would alter our October 1, 2018 goodwill impairment analysis. Our reporting units as of December 31, 2018 are described in detail in Note 2.h. to Notes to Consolidated Financial Statements included in our Annual Report. On March 19, 2019, we divested the business included in our former Consumer Storage reporting unit, which had no goodwill associated with it at December 31, 2018 or at the date of the divestment. See Note 9 for additional information. The goodwill associated with acquisitions completed during the first three months of 2019 (which are described in Note 3) has been incorporated into our reporting units as they existed as of December 31, 2018. The changes in the carrying value of goodwill attributable to each reportable operating segment for the three months ended March 31, 2019 are as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate and Other Business Total Goodwill balance, net of accumulated amortization as of December 31, 2018 $ 2,251,795 $ 493,491 $ 381,806 $ 818,223 $ 425,956 $ 69,759 $ 4,441,030 Deductible goodwill acquired during the year 5,501 — — — — — 5,501 Non-deductible goodwill acquired during the year — — 4,991 3,767 — 1,874 10,632 Fair value and other adjustments(1) 31 — 92 3,350 (871 ) (468 ) 2,134 Currency effects 3,921 1,067 1,393 1,126 (1,566 ) 140 6,081 Goodwill balance, net accumulated amortization as of March 31, 2019 $ 2,261,248 $ 494,558 $ 388,282 $ 826,466 $ 423,519 $ 71,305 $ 4,465,378 Accumulated Goodwill Impairment Balance as of December 31, 2018 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 Accumulated Goodwill Impairment Balance as of March 31, 2019 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 _______________________________________________________________________________ (1) Total fair value and other adjustments primarily include $2,565 in net adjustments related to property, plant and equipment, customer relationships and data center lease-based intangible assets and deferred income taxes and other liabilities offset by $431 of cash received related to certain acquisitions completed in 2018. Finite-lived Intangible Assets and Liabilities Finite-lived intangible assets and liabilities are primarily comprised of customer relationship intangible assets, customer inducements and data center intangible assets and liabilities (which include data center in-place lease intangible assets, data center tenant relationship intangible assets, data center above-market in-place lease intangible assets and data center below-market in-place lease intangible assets). Since December 31, 2018, there have been no changes to our accounting policies related to the accounting for any of our finite-lived intangible assets and liabilities as disclosed in Note 2.i. to Notes to Consolidated Financial Statements included in our Annual Report. The gross carrying amount and accumulated amortization of our finite-lived intangible assets as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Assets: Customer relationship intangible assets $ 1,754,794 $ (482,971 ) $ 1,271,823 $ 1,718,919 $ (455,705 ) $ 1,263,214 Customer inducements 51,405 (28,711 ) 22,694 56,478 (34,181 ) 22,297 Data center lease-based intangible assets(1) 265,834 (65,013 ) 200,821 271,818 (50,807 ) 221,011 Third-party commissions asset(2) 30,861 (737 ) 30,124 30,071 (1,089 ) 28,982 $ 2,102,894 $ (577,432 ) $ 1,525,462 $ 2,077,286 $ (541,782 ) $ 1,535,504 Liabilities: Data center below-market leases $ 12,715 $ (2,451 ) $ 10,264 $ 12,318 $ (1,642 ) $ 10,676 _______________________________________________________________________________ (1) Includes data center in-place lease intangible assets, data center tenant relationship intangible assets and data center above-market in-place lease intangible assets. (2) Third-party commissions asset is included in Other, a component of Other assets, net in the accompanying Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018. The third-party commissions asset is primarily comprised of additional payments associated with the execution of future customer contracts through the one-year anniversary of the acquisition of IODC, as described in Note 3. Other finite-lived intangible assets, including trade names, noncompetition agreements and trademarks, are capitalized and amortized and are included in depreciation and amortization in the accompanying Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018. The other finite-lived intangible assets as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Other finite-lived intangible assets (included in Other, a component of other assets, net) $ 20,290 $ (15,794 ) $ 4,496 $ 20,310 $ (14,798 ) $ 5,512 Amortization expense associated with finite-lived intangible assets, revenue reduction associated with the amortization of customer inducements 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, 2019 and 2018 are as follows: Three Months Ended March 31, 2019 2018 Amortization expense included in depreciation and amortization associated with: Customer relationship and customer inducement intangible assets $ 27,881 $ 28,806 Data center in-place leases and tenant relationships 12,609 10,838 Third-party commissions asset and other finite-lived intangible assets 757 1,185 Revenue reduction associated with amortization of: Customer inducements $ 2,740 $ 2,585 Data center above-market leases and data center below-market leases 905 1,079 c. Revenues Since December 31, 2018, there have been no changes to our accounting policies related to the accounting for revenues as disclosed in Note 2.l. to Notes to Consolidated Financial Statements included in our Annual Report. The costs of the initial intake of customer records into physical storage ("Intake Costs") and capitalized commissions asset (collectively, "Contract Fulfillment Costs") as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Description Location in Balance Sheet Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Intake Costs asset Other (within Other Assets, Net) $ 36,155 $ (21,041 ) $ 15,114 $ 39,748 $ (24,504 ) $ 15,244 Capitalized commissions asset Other (within Other Assets, Net) 52,485 (24,923 ) 27,562 58,424 (34,637 ) 23,787 Amortization expense associated with the Intake Costs asset and capitalized commissions asset for the three months ended March 31, 2019 and 2018 are as follows: Three Months Ended 2019 2018 Intake Costs asset $ 2,679 $ 2,730 Capitalized commissions asset 3,946 3,587 Deferred revenue liabilities are reflected as follows in our Condensed Consolidated Balance Sheets: Description Location in Balance Sheet March 31, 2019 December 31, 2018 Deferred revenue - Current Deferred revenue $ 266,314 $ 264,823 Deferred revenue - Long-term Other Long-term Liabilities 25,625 26,401 Data Center Lessor Considerations Our data center business features storage rental provided to customers at contractually specified rates over a fixed contractual period. Prior to January 1, 2019, our data center revenue contracts were accounted for in accordance with Accounting Standards Codification (“ASC”) No. 840, Leases ("ASC 840"). On January 1, 2019, we adopted ASU 2016-02, as described in more detail in Note 2.d. Beginning on January 1, 2019, our data center revenue contracts will be accounted for in accordance with ASU 2016-02. ASU 2016-02 provides a practical expedient which allows lessors to account for nonlease components (such as power and connectivity, in the case of our data center business) with the related lease component if both the timing and pattern of transfer are the same for nonlease components and the lease component, and the lease component would be classified as an operating lease. The single combined component is accounted for under ASU 2016-02 if the lease component is the predominant component and is accounted for under ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), if the nonlease components are the predominant components. We have elected to take this practical expedient. Storage rental revenue associated with our data center business was $59,718 for the three months ended March 31, 2019, which includes approximately $9,100 of revenue associated with power and connectivity. The revenue related to the service component of our data center business remains unchanged from the adoption of ASU 2016-02 and is recognized in the period the related services are provided. Our accounting treatment for data center revenue was not significantly impacted by the adoption of ASU 2016-02. d. Leases We lease facilities for certain warehouses, data centers and office space. We also have land leases, including those on which certain facilities are located. The majority of our leased facilities are classified as operating leases that, on average, have initial lease terms of five to 10 years, with one or more lease renewal options to extend the lease term. Our lease renewal option terms generally range from one to five years. The exercise of the lease renewal option is at our sole discretion and may contain fixed rent, fair market value based rent or Consumer Price Index rent escalation clauses. We include option periods in the lease term when our failure to renew the lease would result in an economic disincentive, thereby making it reasonably certain that we will renew the lease. We recognize straight line rental expense over the life of the lease and any fair market value or Consumer Price Index rent escalations are recognized as variable lease expense in the period in which the obligation is incurred. In addition, we lease certain vehicles and equipment. Vehicle and equipment leases have lease terms ranging from one to seven years. In February 2016, the Financial Accounting Standards Board ("FASB") issued ASU 2016-02, Leases (Topic 842) which requires lessees to recognize assets and liabilities on the balance sheet for the rights and obligations created by all leases, both operating and financing (formerly referred to as capital leases under ASC 840). ASU 2016-02 requires certain qualitative and quantitative disclosures designed to give financial statement users information on the amount, timing, and uncertainty of cash flows arising from leases. We adopted ASU 2016-02 on January 1, 2019 on a modified retrospective basis under which we recognized and measured leases existing at, or entered into after, the beginning of the period of adoption. Therefore, we applied ASC 840 to all earlier comparative periods (prior to the adoption of ASU 2016-02), including disclosures, and recognized the effects of applying ASU 2016-02 as a cumulative-effect adjustment to retained earnings as of January 1, 2019, the effective date of the standard. As such, the comparative Condensed Consolidated Balance Sheet as of December 31, 2018 has not been restated to reflect the adoption of ASU 2016-02. Accordingly, the majority of the amount presented as deferred rent liabilities on our Consolidated Balance Sheet as of December 31, 2018 is now included in the calculation of operating lease right-of-use assets and any remaining amounts are now classified within other liability line items on our Condensed Consolidated Balance Sheet as of March 31, 2019. The transition guidance associated with ASU 2016-02 also permitted certain practical expedients. We elected the "package of 3" practical expedients permitted under the transition guidance which, among other things, allowed us to carryforward our historical lease classifications. We also adopted an accounting policy which provides that leases with an initial term of 12 months or less will not be included within the lease right-of-use assets and lease liabilities recognized on our Condensed Consolidated Balance Sheets after the adoption of ASU 2016-02. We will continue to recognize the lease payments for those leases with an initial term of 12 months or less in the Consolidated Statements of Operations on a straight-line basis over the lease term. The lease right-of-use assets and related lease liabilities are classified as either operating or financing. Lease right-of-use assets are calculated as the net present value of future payments plus any capitalized initial direct costs less any tenant improvements or lease incentives. Lease liabilities are calculated as the net present value of future payments. In calculating the present value of the lease payments, we will utilize the rate stated within the lease (in the limited circumstances when such rate is available) or, if no rate is explicitly stated, we have elected to utilize a rate that reflects our securitized incremental borrowing rate by geography for the lease term. In July 2018, the FASB issued ASU 2018-11, Leases - Targeted Improvements ("ASU 2018-11"). ASU 2018-11 provides a practical expedient which allows lessees to account for nonlease components (which include common area maintenance, taxes, and insurance) with the related lease component. Any variable nonlease components are not included within the lease right-of-use asset and lease liability on the Condensed Consolidated Balance Sheets, and instead, are reflected as an expense in the period incurred. We have elected to take this practical expedient upon adoption of ASU 2016-02. At January 1, 2019, we recognized the cumulative effect of initially applying ASU 2016-02 as an adjustment to the opening balance of (distributions in excess of earnings) earnings in excess of distributions, resulting in an increase of approximately $5,800 to stockholders' equity due to certain build to suit leases that were accounted for as financing leases under ASC 840, Leases , but are accounted for as operating leases under ASU 2016-02 at January 1, 2019. Operating and financing lease right-of-use assets and lease liabilities as of March 31, 2019 and January 1, 2019 (date of adoption of ASU 2016-02) are as follows: Description Location in Balance Sheet March 31, 2019 January 1, 2019 Assets: Operating lease right-of-use assets(1) Operating lease right-of-use assets $ 1,791,536 $ 1,825,721 Financing lease right-of-use assets, net of accumulated depreciation(2) Property, plant and equipment, net 351,750 361,078 Total $ 2,143,286 $ 2,186,799 Liabilities: Current Operating lease liabilities Accrued expenses and other current liabilities $ 206,286 $ 209,911 Financing lease liabilities Current portion of long-term debt 51,222 50,437 Total current lease liabilities 257,508 260,348 Long-term Operating lease liabilities Long-term operating lease liabilities, net of current portion 1,656,659 1,685,771 Financing lease liabilities Long-term Debt, net of current portion 338,728 350,263 Total long-term lease liabilities 1,995,387 2,036,034 Total $ 2,252,895 $ 2,296,382 ______________________________________________________________ (1) At March 31, 2019, these assets are comprised of approximately 98% real estate related assets (which include land, buildings and racking) and 2% non-real estate related assets (which include warehouse equipment, vehicles, furniture and fixtures and computer hardware and software). (2) At March 31, 2019, these assets are comprised of approximately 66% real estate related assets and 34% non-real estate related assets. The components of the lease expense for the three months ended March 31, 2019 is as follows: Description Location in Statement of Operations Amount Operating lease cost(1) Cost of sales and Selling, general and administrative $ 111,906 Financing lease cost: Depreciation of financing lease right-of-use assets Depreciation and amortization $ 16,329 Interest expense for financing lease liabilities Interest expense, net 6,142 Total financing lease cost $ 22,471 ______________________________________________________________ (1) Of the $111,906 of operating lease cost incurred for the three months ended March 31, 2019, $108,601 is included within Cost of sales and $3,305 is included within Selling, general and administrative expenses. Operating lease cost includes variable lease costs of $25,489 . We sublease certain real estate to third parties. The sublease income recognized for the three months ended March 31, 2019 is $3,047 . Weighted average remaining lease terms and discount rates as of March 31, 2019 are as follows: Remaining Lease Term: Operating leases 11.1 Years Financing leases 11.0 Years Discount Rate: Operating leases 7.1% Financing leases 5.7% The estimated minimum future lease payments as of December 31, 2018, are as follows: Year Operating Leases(1) Sublease Income Capital Leases(1)(2) 2019 $ 323,454 $ (7,525 ) $ 80,513 2020 293,276 (7,200 ) 71,335 2021 267,379 (7,063 ) 61,269 2022 246,128 (6,694 ) 52,832 2023 221,808 (6,409 ) 44,722 Thereafter 1,287,807 (6,279 ) 377,750 Total minimum lease payments 2,639,852 $ (41,170 ) 688,421 Less amounts representing interest (241,248 ) Present value of finance lease obligations $ 447,173 The estimated minimum future lease payments as of March 31, 2019, are as follows: Year Operating Leases(1) Sublease Income Financing Leases(1) 2019 (excluding the three months ended March 31, 2019) $ 251,699 $ (6,039 ) $ 59,411 2020 308,267 (7,337 ) 68,333 2021 280,931 (7,228 ) 59,710 2022 257,598 (6,851 ) 49,997 2023 234,035 (6,548 ) 39,643 Thereafter 1,409,241 (6,922 ) 287,609 Total minimum lease payments 2,741,771 $ (40,925 ) 564,703 Less amounts representing interest or imputed interest (878,826 ) (174,753 ) Present value of lease obligations 1,862,945 $ 389,950 _______________________________________________________________________________ (1) Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2018 and March 31, 2019 are primarily related to adjustments to account for certain build to suit leases that were accounted for as financing obligations under ASC 840 but are accounted for as operating leases under ASU 2016-02 and foreign currency exchange rate impacts. (2) Includes capital lease and financing obligations associated with build to suit lease transactions at December 31, 2018. As of March 31, 2019, we do not have any material operating or financing leases that are signed but have not yet commenced and we have certain leases with related parties which are not material to our consolidated financial statements. Other information: Supplemental cash flow information relating to our leases for the three months ended March 31, 2019 is as follows: Cash paid for amounts included in measurement of lease liabilities: Three Months Ended Operating cash flows used in operating leases $ 83,676 Financing cash flows used in financing leases $ 16,675 Non-cash items: Operating lease modifications and reassessments $ 1,842 New operating leases (including acquisitions) $ 21,535 Financing lease modifications and reassessments $ — New financing leases $ 7,523 e. 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 (together, "Employee Stock-Based Awards"). There have been no significant changes to our accounting policies, assumptions and valuation methodologies related to the accounting for our Employee Stock-Based Awards as disclosed in Note 2.n. to Notes to Consolidated Financial Statements included in our Annual Report. For our Employee Stock-Based Awards made on or after February 20, 2019, we have included the following retirement provision: Upon an employee’s retirement on or after attaining age 58, if the sum of (i) the award recipient’s age at retirement and (ii) the award recipient’s years of service with the company totals at least 70, the award recipient is entitled to continued vesting of any outstanding Employee Stock-Based Awards which include the 2019 Retirement Criteria subsequent to their retirement, provided that, for awards granted in the year of retirement, their retirement occurs on or after July 1st (the “2019 Retirement Criteria”). Accordingly, (i) grants of Employee Stock-Based Awards to an employee who has met the 2019 Retirement Criteria on or before the date of grant, or will meet the Retirement Criteria before July 1 st of the year of the grant, will be expensed between the date of grant and July 1 st of the grant year and (ii) grants of Employee Stock-Based Awards to employees who will meet the 2019 Retirement Criteria during the award’s normal vesting period will be expensed between the date of grant and the date upon which the award recipient meets the 2019 Retirement Criteria. Stock options and RSUs granted to recipients who meet the 2019 Retirement Criteria will continue vesting on the original vesting schedule, and the stock options will remain exercisable up to three years after retirement, or the original expiration date of the stock options, if earlier. PUs granted to recipients who meet the 2019 Retirement Criteria will continue to vest and be delivered in accordance with the original vesting schedule of the applicable PU award and remain subject to the same performance conditions. Stock-based compensation expense for Employee Stock-Based Awards for the three months ended March 31, 2019 and 2018 was $8,519 ( $7,935 after tax or $0.03 per basic and diluted share) and $7,384 ( $6,833 after tax or $0.02 per basic and diluted share), respectively, the substantial majority of which is included in Selling, general and administrative expenses in the accompanying Condensed Consolidated Statements of Operations. As of March 31, 2019 , unrecognized compensation cost related to the unvested portion of our Employee Stock-Based Awards was $72,353 and is expected to be recognized over a weighted-average period of 2.2 years. Stock Options A summary of stock option activity for the three months ended March 31, 2019 is as follows: Stock Options Outstanding at December 31, 2018 4,271,834 Granted 920,706 Exercised (99,334 ) Forfeited (6,007 ) Expired (9,629 ) Outstanding at March 31, 2019 5,077,570 Options exercisable at March 31, 2019 3,258,982 Options expected to vest 1,691,146 Restricted Stock Units The fair value of RSUs vested during the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Fair value of RSUs vested $ 15,333 $ 15,330 A summary of RSU activity for the three months ended March 31, 2019 is as follows: RSUs Non-vested at December 31, 2018 1,196,566 Granted 621,281 Vested (453,167 ) Forfeited (18,075 ) Non-vested at March 31, 2019 1,346,605 Performance Units The fair value of earned PUs that vested during the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Fair value of earned PUs that vested $ 6,503 $ 3,033 A summary of PU activity for the three months ended March 31, 2019 is as follows: Original PU Adjustment(1) Total Non-vested at December 31, 2018 967,049 (299,948 ) 667,101 Granted 380,856 — 380,856 Vested (169,523 ) — (169,523 ) Forfeited/Performance or Market Conditions Not Achieved (4,816 ) (14,850 ) (19,666 ) Non-vested at March 31, 2019 1,173,566 (314,798 ) 858,768 _______________________________________________________________________________ (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. As of March 31, 2019 , we expected 100% achievement of the predefined revenue, return on invested capital and Adjusted EBITDA (as defined in Note 6) targets associated with the awards of PUs made in 2019 , 2018 and 2017 . f. 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. The calculation of basic and diluted income (loss) per share for the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Income (loss) from continuing operations $ 30,476 $ 45,614 Less: Net income (loss) attributable to noncontrolling interests 891 468 Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) $ 29,585 $ 45,146 (Loss) income from discontinued operations, net of tax $ (24 ) $ (462 ) Net income (loss) attributable to Iron Mountain Incorporated $ 29,561 $ 44,684 Weighted-average shares—basic 286,528,000 285,259,000 Effect of dilutive potential stock options 231,402 249,564 Effect of dilutive potential RSUs and PUs 732,421 484,314 Weighted-average shares—diluted 287,491,823 285,992,878 Earnings (losses) per share—basic: Income (loss) from continuing operations $ 0.10 $ 0.16 (Loss) income from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.10 $ 0.16 Earnings (losses) per share—diluted: Income (loss) from continuing operations $ 0.10 $ 0.16 (Loss) income from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.10 $ 0.16 Antidilutive stock options, RSUs and PUs, excluded from the calculation 3,985,161 3,242,141 _______________________________________________________________________________ (1) Columns may not foot due to rounding. g. 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 rates for the years ending December 31, 2019 and 2018 reflect the impact of the U.S. tax reform legislation, commonly referred to as the Tax Cuts and Jobs Act (the “Tax Reform Legislation”). See Note 7 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding the impact the Tax Reform Legislation had on us. 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. Our effective tax rates for the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019(1) 2018(2) Effective Tax Rate 25.7 % 2.5 % _______________________________________________________________________________ (1) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended March 31, 2019 were the benefit derived from the dividends paid deduction and the impact of differences in the tax rates at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates. (2) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended March 31, 2018 were the benefit derived from the dividends paid deduction, a discrete tax benefit of approximately $14,000 associated with the resolution of a tax matter and the impact of differences in the tax rates at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates. h. 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. The assets and liabilities carried at fair value measured on a recurring basis as of March 31, 2019 and December 31, 2018 , respectively, are as follows: Fair Value Measurements at Description Total Carrying Quoted prices Significant other Significant Money Market Funds(1) $ 1,739 $ — $ 1,739 $ — Trading Securities 10,160 9,490 (2) 670 (3) — Derivative Assets (4) 23 — 23 — Derivative Liabilities(4) 109 — 109 — Interest Rate Swap Agreements Liabilities(5) 3,647 — 3,647 — Fair Value Measurements at Description Total Carrying Value at December 31, 2018 Quoted prices in active markets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Time Deposits(1) $ 956 $ — $ 956 $ — Trading Securities 10,753 10,248 (2) 505 (3) — Derivative Assets(4) 93 — 93 — Interest Rate Swap Agreements Liabilities(5) 973 — 973 — _______________________________________________________________________________ (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. 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. As of March 31, 2019, we had outstanding forward contracts to (i) purchase 4,000 Euros and sell $4,610 United State

Acquisitions

Acquisitions	3 Months Ended
	Mar. 31, 2019
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. Acquisitions Completed During the Three Months Ended March 31, 201 9 In order to enhance our existing operations in the United States, the United Kingdom and Switzerland and to expand our operations into Bulgaria, we completed the acquisition of four storage and records management companies and one art storage company for total cash consideration of approximately $31,900 . Purchase Price Allocation A summary of the cumulative consideration paid and the preliminary allocation of the purchase price paid for all of our 2019 acquisitions through March 31, 2019 is as follows: Three Months Ended Cash Paid (gross of cash acquired)(1) $ 34,198 Purchase Price Holdbacks and Other 1,042 Total Consideration 35,240 Fair Value of Identifiable Assets Acquired: Cash 2,273 Accounts Receivable, Prepaid Expenses and Other Assets 2,845 Property, Plant and Equipment(2) 4,039 Customer Relationship Intangible Assets 13,589 Operating Lease Right-of-Use Assets 10,541 Accounts Payable, Accrued Expenses and Other Liabilities (2,065 ) Operating Lease Liabilities (10,541 ) Deferred Income Taxes (1,574 ) Total Fair Value of Identifiable Net Assets Acquired 19,107 Goodwill Initially Recorded(3) $ 16,133 _______________________________________________________________________________ (1) Included in cash paid for acquisitions in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2019 is net cash acquired of $2,273 and contingent and other payments, net of $7,498 related to acquisitions made in previous years. (2) Consists primarily of 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. See Note 6 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding our allocations of the purchase price for acquisitions. The preliminary purchase price allocations that are not finalized as of March 31, 2019 primarily relate to the final assessment of the fair values of intangible assets and liabilities (primarily customer relationship intangible assets and data center lease-based intangible assets), property, plant and equipment (primarily building, building improvements, data center infrastructure and racking structures), right-of-use assets and liabilities associated with acquired operating leases, contingencies and income taxes (primarily deferred income taxes), primarily associated with the EvoSwitch Transaction (as defined in Note 6 to Notes to Consolidated Financial Statements included in our Annual Report), as well as other acquisitions we closed in 2019. 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, 2019 were not material to our results from operations. Acquisition of IO Data Centers in 2018 On January 10, 2018, we completed the IODC Transaction. At the closing of the IODC Transaction, we paid approximately $1,347,000 . In February 2019, we paid approximately $31,000 in additional purchase price associated with the execution of customer contracts from the closing through the one-year anniversary of the IODC Transaction, which was accrued at December 31, 2018. This amount, net of amortization, is reported as a third-party commissions asset as a component of Other within Other assets, net, in our Condensed Consolidated Balance Sheets at March 31, 2019 and December 31, 2018. 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 the period presented, includes purchase accounting adjustments (including amortization expenses from acquired intangible assets and depreciation of acquired property, plant and equipment). We and IODC 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, 2018 Total Revenues $ 1,045,948 Income from Continuing Operations $ 55,566 Per Share Income from Continuing Operations - Basic $ 0.20 Per Share Income from Continuing Operations - Diluted $ 0.19 In addition to our acquisition of IODC, we completed certain other acquisitions during the first three months of 2019 and in fiscal year 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.

Debt

Debt	3 Months Ended
	Mar. 31, 2019
Debt Disclosure [Abstract]
Debt	Long-term debt is as follows: March 31, 2019 December 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(1) $ 1,139,566 $ (13,332 ) $ 1,126,234 $ 1,139,566 $ 793,832 $ (14,117 ) $ 779,715 $ 793,832 Term Loan A(1) 237,500 — 237,500 237,500 240,625 — 240,625 240,625 Term Loan B(2) 691,476 (8,430 ) 683,046 670,478 693,169 (8,742 ) 684,427 660,013 Australian Dollar Term Loan (the "AUD Term Loan")(3) 234,000 (2,893 ) 231,107 235,587 233,955 (3,084 ) 230,871 235,645 UK Bilateral Revolving Credit Facility ("UK Bilateral Facility")(4) 182,450 (2,255 ) 180,195 182,450 178,299 (2,357 ) 175,942 178,299 4 3 / 8 % Senior Notes due 2021 (the "4 3 / 8 % Notes")(5) 500,000 (3,725 ) 496,275 502,500 500,000 (4,155 ) 495,845 488,750 6% Senior Notes due 2023 (the "6% Notes due 2023")(5) 600,000 (4,851 ) 595,149 615,000 600,000 (5,126 ) 594,874 606,000 5 3 / 8 % CAD Senior Notes due 2023 (the "CAD Notes") 187,262 (2,424 ) 184,838 189,444 183,403 (2,506 ) 180,897 186,154 5 3 / 4 % Senior Subordinated Notes due 2024 (the "5 3 / 4 % Notes")(5) 1,000,000 (7,439 ) 992,561 1,010,000 1,000,000 (7,782 ) 992,218 940,000 3% Euro Senior Notes due 2025 (the "Euro Notes")(5) 336,557 (3,941 ) 332,616 337,684 343,347 (4,098 ) 339,249 321,029 3 7 / 8 % GBP Senior Notes due 2025 (the "GBP Notes") 521,286 (6,480 ) 514,806 495,852 509,425 (6,573 ) 502,852 453,811 5 3 / 8 % Senior Notes due 2026 (the "5 3 / 8 % Notes") 250,000 (3,078 ) 246,922 246,875 250,000 (3,185 ) 246,815 224,375 4 7 / 8 % Senior Notes due 2027 (the "4 7 / 8 % Notes")(5) 1,000,000 (12,086 ) 987,914 957,500 1,000,000 (12,442 ) 987,558 855,000 5 1 / 4 % Senior Notes due 2028 (the "5 1 / 4 % Notes")(5) 825,000 (10,628 ) 814,372 798,188 825,000 (10,923 ) 814,077 713,625 Real Estate Mortgages, Financing Lease Liabilities and Other 566,677 (431 ) 566,246 566,677 606,702 (171 ) 606,531 606,702 Accounts Receivable Securitization Program(6) 252,373 (184 ) 252,189 252,373 221,673 (218 ) 221,455 221,673 Mortgage Securitization Program(7) 50,000 (1,091 ) 48,909 50,000 50,000 (1,128 ) 48,872 50,000 Total Long-term Debt 8,574,147 (83,268 ) 8,490,879 8,229,430 — (86,607 ) 8,142,823 Less Current Portion (125,142 ) — (125,142 ) (126,406 ) — (126,406 ) Long-term Debt, Net of Current Portion $ 8,449,005 $ (83,268 ) $ 8,365,737 $ 8,103,024 $ (86,607 ) $ 8,016,417 ______________________________________________________________ (1) Collectively, the credit agreement ("Credit Agreement"). The Credit Agreement consists of a revolving credit facility (the "Revolving Credit Facility") and a term loan (the "Term Loan A"). The Credit Agreement is scheduled to mature on June 3, 2023. Of the $1,139,566 of outstanding borrowings under the Revolving Credit Facility as of March 31, 2019, 965,800 was denominated in United States dollars, 94,200 was denominated in Canadian dollars and 92,000 was denominated in Euros. In addition, we also had various outstanding letters of credit totaling $37,271 . The remaining amount available for borrowing under the Revolving Credit Facility as of March 31, 2019 was $573,163 (which amount represents the maximum availability as of such date). The average interest rate in effect under the Credit Agreement was 4.0% as of March 31, 2019 . The average interest rate in effect under the Revolving Credit Facility as of March 31, 2019 was 4.0% and the interest rate in effect under Term Loan A as of March 31, 2019 was 4.2% . (2) In connection with the 2018 First Amendment (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report), Iron Mountain Information Management, LLC ("IMIM") entered into an incremental term loan activation notice (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, IMIM borrowed the full amount of the Term Loan B. The Term Loan B is scheduled to mature on January 2, 2026. The interest rate in effect as of March 31, 2019 was 4.3% . The amount of debt for the Term Loan B reflects an unamortized original issue discount of $1,524 and $1,581 as of March 31, 2019 and December 31, 2018, respectively. (3) The interest rate in effect as of March 31, 2019 was 5.7% . We had 331,875 Australian dollars outstanding on the AUD Term Loan as of March 31, 2019. The amount of debt for the AUD Term Loan reflects an unamortized original issue discount of $1,587 and $1,690 as of March 31, 2019 and December 31, 2018, respectively. (4) The interest rate in effect as of March 31, 2019 was 3.2% . (5) Collectively, the "Parent Notes". (6) The interest rate in effect as of March 31, 2019 was 3.5% . (7) The interest rate in effect as of March 31, 2019 was 3.5% . See Note 4 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding our Credit Agreement and our other 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, 2019 are consistent with the levels of the fair value hierarchy used to determine the fair value of our debt as of December 31, 2018 (which are disclosed in our Annual Report). Additionally, see Note 5 to Notes to Consolidated Financial Statements included in our Annual Report for information regarding which of our consolidated subsidiaries guarantee certain of our debt instruments. There have been no material changes to our long-term debt since December 31, 2018. Cash Pooling As described in greater detail in Note 4 to Notes to Consolidated Financial Statements included in our Annual Report, certain of our subsidiaries participate in cash pooling arrangements (the “Cash Pools”) in order to help manage global liquidity requirements. We currently utilize two separate cash pools, 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"). The approximate amount of the net cash position for our QRS Cash Pool and the TRS Cash Pool and the approximate amount of the gross position and outstanding debit balances for each of these pools as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Cash Position Outstanding Debit Balances Net Cash Position Gross Cash Position Outstanding Debit Balances Net Cash Position QRS Cash Pool $ 271,400 $ (269,400 ) $ 2,000 $ 300,800 $ (298,800 ) $ 2,000 TRS Cash Pool 281,100 (277,900 ) 3,200 $ 281,500 (279,300 ) 2,200 The net cash position balances as of March 31, 2019 and December 31, 2018 are reflected as cash and cash equivalents in the Condensed Consolidated Balance Sheets. Debt Covenants 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 March 31, 2019 and December 31, 2018, as well as our leverage ratio under our indentures as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Maximum/Minimum Allowable Net total lease adjusted leverage ratio 5.8 5.6 Maximum allowable of 6.5 Net secured debt lease adjusted leverage ratio 2.8 2.6 Maximum allowable of 4.0 Bond leverage ratio (not lease adjusted) 6.1 5.8 Maximum allowable of 6.5-7.0(1) Fixed charge coverage ratio 2.2 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 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. Noncompliance with these leverage and fixed charge coverage ratios would have a material adverse effect on our financial condition and liquidity.

Selected Consolidated Financial

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors	3 Months Ended
	Mar. 31, 2019
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 March 31, 2019 and December 31, 2018 and for the three months ended March 31, 2019 and 2018 and are prepared on the same basis as the consolidated financial statements. The Parent Notes, the CAD Notes, the GBP Notes, 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 Iron Mountain Canada Operations ULC ("Canada Company"), the GBP Notes, 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 and IM UK do not guarantee the Parent Notes. The subsidiaries that do not guarantee the Parent Notes, the CAD Notes, the GBP Notes, and the 5 3 / 8 % Notes are referred to below as the Non-Guarantors. 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 March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 11 $ 122,114 $ 109,991 $ (70,641 ) $ 161,475 Accounts receivable — 37,598 799,923 — 837,521 Intercompany receivable — 1,032,582 — (1,032,582 ) — Prepaid expenses and other — 110,223 100,660 (29 ) 210,854 Total Current Assets 11 1,302,517 1,010,574 (1,103,252 ) 1,209,850 Property, Plant and Equipment, Net 168 2,999,744 1,525,671 — 4,525,583 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 5,009,984 — — (5,009,984 ) — Investment in subsidiaries 1,926,435 1,017,247 — (2,943,682 ) — Goodwill — 2,857,855 1,607,523 — 4,465,378 Operating lease right-of-use assets — 895,920 895,616 — 1,791,536 Other 5 976,403 720,608 — 1,697,016 Total Other Assets, Net 6,936,424 5,747,425 3,223,747 (7,953,666 ) 7,953,930 Total Assets $ 6,936,603 $ 10,049,686 $ 5,759,992 $ (9,056,918 ) $ 13,689,363 Liabilities and Equity Intercompany Payable $ 729,843 $ — $ 302,739 $ (1,032,582 ) $ — Debit Balances Under Cash Pools — — 70,641 (70,641 ) — Current Portion of Long-Term Debt — 55,940 69,231 (29 ) 125,142 Total Other Current Liabilities (includes current portion of operating lease liabilities) 224,825 632,699 532,467 — 1,389,991 Long-Term Debt, Net of Current Portion 4,218,887 2,212,686 1,934,164 — 8,365,737 Long-Term Operating Lease Liabilities, Net of Current Portion — 832,007 824,652 — 1,656,659 Long-Term Notes Payable to Affiliates and Intercompany Payable — 5,009,984 — (5,009,984 ) — Other Long-term Liabilities 3,647 51,575 262,776 — 317,998 Commitments and Contingencies (See Note 7) Redeemable Noncontrolling Interests — — 73,102 — 73,102 Total Iron Mountain Incorporated Stockholders' Equity 1,759,401 1,254,795 1,688,887 (2,943,682 ) 1,759,401 Noncontrolling Interests — — 1,333 — 1,333 Total Equity 1,759,401 1,254,795 1,690,220 (2,943,682 ) 1,760,734 Total Liabilities and Equity $ 6,936,603 $ 10,049,686 $ 5,759,992 $ (9,056,918 ) $ 13,689,363 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at March 31, 2019 is approximately $76,000 and $0 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. CONDENSED CONSOLIDATED BALANCE SHEETS (Continued) December 31, 2018 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 132 $ 61,650 $ 169,318 $ (65,615 ) $ 165,485 Accounts receivable — 47,900 798,989 — 846,889 Intercompany receivable — 818,463 — (818,463 ) — Prepaid expenses and other 93 108,879 86,797 (29 ) 195,740 Total Current Assets 225 1,036,892 1,055,104 (884,107 ) 1,208,114 Property, Plant and Equipment, Net 190 3,002,104 1,487,263 — 4,489,557 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,954,686 — — (4,954,686 ) — Investment in subsidiaries 1,885,174 1,006,144 — (2,891,318 ) — Goodwill — 2,858,539 1,582,491 — 4,441,030 Other — 979,483 734,063 — 1,713,546 Total Other Assets, Net 6,839,860 4,844,166 2,316,554 (7,846,004 ) 6,154,576 Total Assets $ 6,840,275 $ 8,883,162 $ 4,858,921 $ (8,730,111 ) $ 11,852,247 Liabilities and Equity Intercompany Payable $ 462,927 $ — $ 355,536 $ (818,463 ) $ — Debit Balances Under Cash Pools — 10,612 55,003 (65,615 ) — Current Portion of Long-Term Debt — 63,703 62,732 (29 ) 126,406 Total Other Current Liabilities 268,373 616,826 451,073 — 1,336,272 Long-Term Debt, Net of Current Portion 4,223,822 1,877,649 1,914,946 — 8,016,417 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,954,686 — (4,954,686 ) — Other Long-term Liabilities 973 115,994 300,064 — 417,031 Commitments and Contingencies (See Note 7) Redeemable Noncontrolling Interests — — 70,532 — 70,532 Total Iron Mountain Incorporated Stockholders' Equity 1,884,180 1,243,692 1,647,626 (2,891,318 ) 1,884,180 Noncontrolling Interests — — 1,409 — 1,409 Total Equity 1,884,180 1,243,692 1,649,035 (2,891,318 ) 1,885,589 Total Liabilities and Equity $ 6,840,275 $ 8,883,162 $ 4,858,921 $ (8,730,111 ) $ 11,852,247 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at December 31, 2018 is approximately $57,200 and $12,700 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Revenues: Storage rental $ — $ 403,741 $ 259,233 $ — $ 662,974 Service — 239,693 151,196 — 390,889 Intercompany revenues — 1,154 4,923 (6,077 ) — Total Revenues — 644,588 415,352 (6,077 ) 1,053,863 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 263,137 198,407 — 461,544 Intercompany — 4,923 1,154 (6,077 ) — Selling, general and administrative 87 187,822 82,650 — 270,559 Depreciation and amortization 23 102,954 59,506 — 162,483 (Gain) Loss on disposal/write-down of property, plant and equipment, net — 574 28 — 602 Total Operating Expenses 110 559,410 341,745 (6,077 ) 895,188 Operating (Loss) Income (110 ) 85,178 73,607 — 158,675 Interest Expense (Income), Net(1) 49,625 4,057 48,754 — 102,436 Other Expense (Income), Net 182 527 14,501 — 15,210 (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (49,917 ) 80,594 10,352 — 41,029 Provision (Benefit) for Income Taxes — 1,301 9,252 — 10,553 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (79,478 ) 4,158 — 75,320 — Income (Loss) from Continuing Operations 29,561 75,135 1,100 (75,320 ) 30,476 (Loss) Income from Discontinued Operations, Net of Tax — (24 ) — — (24 ) Net Income (Loss) 29,561 75,111 1,100 (75,320 ) 30,452 Less: Net Income (Loss) Attributable to Noncontrolling Interests — — 891 — 891 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 29,561 $ 75,111 $ 209 $ (75,320 ) $ 29,561 Net Income (Loss) $ 29,561 $ 75,111 $ 1,100 $ (75,320 ) $ 30,452 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments 6,141 — 12,050 — 18,191 Change in fair value of interest rate swap agreements (2,674 ) — — — (2,674 ) Equity in Other Comprehensive (Loss) Income of Subsidiaries 11,237 7,156 — (18,393 ) — Total Other Comprehensive Income (Loss) 14,704 7,156 12,050 (18,393 ) 15,517 Comprehensive Income (Loss) 44,265 82,267 13,150 (93,713 ) 45,969 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — 1,704 — 1,704 Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 44,265 $ 82,267 $ 11,446 $ (93,713 ) $ 44,265 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements. 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 Intercompany cost of sales — 4,491 1,205 (5,696 ) — Selling, general and administrative 43 185,348 84,339 — 269,730 Depreciation and amortization 33 102,446 58,099 — 160,578 (Gain) Loss on disposal/write-down of property, plant and equipment, net — (356 ) (774 ) — (1,130 ) Total Operating Expenses 76 538,092 345,427 (5,696 ) 877,899 Operating (Loss) Income (76 ) 89,819 74,816 — 164,559 Interest Expense (Income), Net(1) 49,941 (1,508 ) 49,193 — 97,626 Other (Income) Expense, 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 (Benefit) Provision 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 — (422 ) (40 ) — (462 ) Net Income (Loss) 44,684 93,192 (2,045 ) (90,679 ) 45,152 Less: Net Income (Loss) 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 Income (Loss) 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 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements. CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (68,310 ) $ 116,235 $ 69,142 $ — $ 117,067 Cash Flows from Operating Activities—Discontinued Operations — — — — — Cash Flows from Operating Activities (68,310 ) 116,235 $ 69,142 $ — $ 117,067 Cash Flows from Investing Activities: Capital expenditures — (84,766 ) (99,999 ) — (184,765 ) Cash paid for acquisitions, net of cash acquired — (9,508 ) (29,915 ) — (39,423 ) Intercompany loans to subsidiaries 252,175 22,859 — (275,034 ) — Acquisitions of customer relationships, customer inducements and data center lease-based intangibles — (49,301 ) (18,611 ) — (67,912 ) Investments in joint ventures (see Note 9) — (19,222 ) — — (19,222 ) Proceeds from sales of property and equipment and other, net — 36 69 — 105 Cash Flows from Investing Activities—Continuing Operations 252,175 (139,902 ) (148,456 ) (275,034 ) (311,217 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — Cash Flows from Investing Activities 252,175 (139,902 ) (148,456 ) (275,034 ) (311,217 ) Cash Flows from Financing Activities: Repayment of revolving credit facility, term loan facilities and other debt — (410,563 ) (940,679 ) — (1,351,242 ) Proceeds from revolving credit facility, term loan facilities and other debt — 734,243 989,219 — 1,723,462 Debit (payments) balances under cash pools — (10,612 ) 15,638 (5,026 ) — Debt (repayment to) financing from and equity (distribution to) contribution from noncontrolling interests, net — — (498 ) — (498 ) Intercompany loans from parent — (228,937 ) (46,097 ) 275,034 — Parent cash dividends (178,023 ) — — — (178,023 ) Net (payments) proceeds associated with employee stock-based awards (5,963 ) — — — (5,963 ) Cash Flows from Financing Activities—Continuing Operations (183,986 ) 84,131 17,583 270,008 187,736 Cash Flows from Financing Activities—Discontinued Operations — — — — — Cash Flows from Financing Activities (183,986 ) 84,131 17,583 270,008 187,736 Effect of exchange rates on cash and cash equivalents — — 2,404 — 2,404 (Decrease) Increase in cash and cash equivalents (121 ) 60,464 (59,327 ) (5,026 ) (4,010 ) Cash and cash equivalents, including Restricted Cash, beginning of period 132 61,650 169,318 (65,615 ) 165,485 Cash and cash equivalents, including Restricted Cash, $ 11 $ 122,114 $ 109,991 $ (70,641 ) $ 161,475 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 ) — 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 — (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 facility, term loan facilities and other debt — (2,308,119 ) (2,102,537 ) — (4,410,656 ) Proceeds from revolving credit facility, 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 (repayment to) financing from and equity (distribution to) contribution from 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, including Restricted Cash, beginning of period 2,433 634,317 383,675 (94,726 ) 925,699 Cash and cash equivalents, including Restricted Cash, end of period $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491

Segment Information

Segment Information	3 Months Ended
	Mar. 31, 2019
Segment Reporting [Abstract]
Segment Information	Our six reportable operating segments as of December 31, 2018 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, 2018, other than the impact of the Consumer Storage Transaction (as defined in Note 9). Prior to the Consumer Storage Transaction, our consumer storage business was a component of our Corporate and Other Business Segment. The 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 2018 as described in Note 9 to Notes to Consolidated Financial Statements included in our Annual Report. The operations associated with acquisitions completed during the first three months of 2019 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, 2019 Total Revenues $ 527,380 $ 96,747 $ 128,753 $ 200,956 $ 61,536 $ 38,491 $ 1,053,863 Storage Rental 306,986 66,572 80,695 129,473 59,718 19,530 662,974 Service 220,394 30,175 48,058 71,483 1,818 18,961 390,889 Depreciation and Amortization 60,002 10,202 15,257 30,599 31,632 14,791 162,483 Depreciation 45,752 8,013 10,947 18,218 19,013 12,668 114,611 Amortization 14,250 2,189 4,310 12,381 12,619 2,123 47,872 Adjusted EBITDA 223,683 50,552 39,209 58,124 26,011 (73,073 ) 324,506 Total Assets(1) 5,823,817 902,514 1,414,878 2,686,938 2,310,001 551,215 13,689,363 Expenditures for Segment Assets 56,265 5,632 30,101 31,254 153,705 15,143 292,100 Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations) 28,688 5,632 2,116 15,149 121,557 11,623 184,765 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 9,876 — 11,484 14,543 — 3,520 39,423 Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs and third-party commissions. 17,701 — 16,501 1,562 32,148 — 67,912 As of and for the Three Months Ended March 31, 2018 Total Revenues $ 526,843 $ 99,964 $ 134,075 $ 210,767 $ 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 50,123 79,020 1,108 8,316 391,309 Depreciation and Amortization 62,752 10,104 17,556 31,873 22,268 16,025 160,578 Depreciation 49,138 8,023 12,758 19,064 11,380 13,069 113,432 Amortization 13,614 2,081 4,798 12,809 10,888 2,956 47,146 Adjusted EBITDA 225,738 53,852 43,966 60,747 20,790 (62,078 ) 343,015 Total Assets(1) 5,030,238 833,690 917,155 2,441,685 1,875,766 899,615 11,998,149 Expenditures for Segment Assets 43,181 6,853 7,480 32,160 1,438,012 14,939 1,542,625 Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations) 29,870 6,853 6,047 25,142 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. Total assets as of March 31, 2019 reflects the adoption of ASU 2016-02. The accounting policies of the reportable operating segments are the same as those described in Note 2 and in Note 2 to Notes to Consolidated Financial Statements included 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, net (including real estate); (ii) intangible impairments; (iii) other expense (income), net (which includes foreign currency transaction (gains) losses, net); and (iv) 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 2019 2018 Adjusted EBITDA $ 324,506 $ 343,015 (Add)/Deduct: Provision (Benefit) for Income Taxes 10,553 1,168 Other Expense (Income), Net 15,210 20,151 Interest Expense, Net 102,436 97,626 Loss (gain) on disposal/write-down of property, plant and equipment, net 602 (1,130 ) Depreciation and Amortization 162,483 160,578 Significant Acquisition Costs(1) 2,746 19,008 Income (Loss) from Continuing Operations $ 30,476 $ 45,614 _______________________________________________________________________________ (1) As defined in Note 9 to Notes to Consolidated Financial Statements included in our Annual Report. Information as to our revenues by product and service lines by segment 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 Total Consolidated For the Three Months Ended March 31, 2019 Records Management(1) $ 427,367 $ — $ 108,707 $ 172,977 $ — $ 24,345 $ 733,396 Data Management(1) — 93,989 19,886 19,227 — 14,146 147,248 Information Destruction(1)(2) 100,013 2,758 160 8,752 — — 111,683 Data Center — — — — 61,536 — 61,536 Total Revenues $ 527,380 $ 96,747 $ 128,753 $ 200,956 $ 61,536 $ 38,491 $ 1,053,863 For the Three Months Ended March 31, 2018 Records Management(1) $ 435,002 $ — $ 113,759 $ 181,330 $ — $ 10,404 $ 740,495 Data Management(1) — 97,594 20,219 20,478 — 13,802 152,093 Information Destruction(1)(2) 91,841 2,370 97 8,959 — — 103,267 Data Center — — — — 46,603 — 46,603 Total Revenues $ 526,843 $ 99,964 $ 134,075 $ 210,767 $ 46,603 $ 24,206 $ 1,042,458 _______________________________________________________________________________ (1) Each of the offerings within our product and service lines has a component of revenue that is storage rental related and a component that is service revenues, except for information destruction, which does not have a storage rental component. (2) Includes secure shredding services.

Commitments and Contingencies

Commitments and Contingencies	3 Months Ended
	Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]
Commitments and Contingencies	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. There have been no material updates or changes to the matters disclosed in Note 10 to Notes to Consolidated Financial Statements included in our Annual Report, nor have there been any new material loss contingencies since December 31, 2018. We believe that the resolution of the matters disclosed in Note 10 to Notes to Consolidated Financial Statements included in our Annual Report will not have a material impact on our consolidated financial condition, results of operations or cash flows. We have estimated a reasonably possible range for all loss contingencies, including those disclosed in Note 10 to Notes to Consolidated Financial Statements included in our Annual Report, and believe it is reasonably possible that we could incur aggregate losses in addition to amounts currently accrued for all matters up to an additional $17,500 over the next several years, of which certain amounts would be covered by insurance or indemnity arrangements.

Stockholders' Equity Matters

Stockholders' Equity Matters	3 Months Ended
	Mar. 31, 2019
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 2018 and the first three months of 2019, our board of directors declared the following dividends: Declaration Date Dividend Record Date Total Payment Date February 14, 2018 $ 0.5875 March 15, 2018 $ 167,969 April 2, 2018 May 24, 2018 0.5875 June 15, 2018 168,078 July 2, 2018 July 24, 2018 0.5875 September 17, 2018 168,148 October 2, 2018 October 25, 2018 0.6110 December 17, 2018 174,935 January 3, 2019 February 7, 2019 0.6110 March 15, 2019 175,242 April 2, 2019 At The Market (ATM) Equity Program As described in greater detail in Note 12 to Notes to Consolidated Financial Statements included in our Annual Report, we entered into a 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”). There were no shares of common stock sold under the At The Market (ATM) Equity Program during the three months ended March 31, 2019. As of March 31, 2019, 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 .

Divestments

Divestments	3 Months Ended
	Mar. 31, 2019
Discontinued Operations and Disposal Groups [Abstract]
Divestments	On March 19, 2019, we contributed our customer contracts and certain intellectual property and other assets used by us to operate our consumer storage business in the United States and Canada (the "IM Consumer Storage Assets") and approximately $20,000 in cash (gross of certain transaction expenses) (the "Cash Contribution") to a joint venture entity, Makespace LLC (the "Makespace JV"), established by us and Makespace Labs, Inc. ("Makespace"), a consumer storage services provider (the "Consumer Storage Transaction"). At the closing date of the Consumer Storage Transaction, the Makespace JV owned (i) the IM Consumer Storage Assets, (ii) the Cash Contribution and (iii) the customer contracts, intellectual property and certain other assets used by Makespace to operate its consumer storage business in the United States. As part of the Consumer Storage Transaction, we received an equity interest of approximately 34% in the Makespace JV (the "Makespace Investment"). In connection with the Consumer Storage Transaction and the Makespace Investment, we also entered into a storage and service agreement with the Makespace JV to provide certain storage and related services to the Makespace JV (see Note 11). We have concluded that the divestment of the IM Consumer Storage Assets in the Consumer Storage Transaction does not meet the criteria to be reported as a discontinued operation in our consolidated financial statements, as our decision to divest this business does not represent a strategic shift that will have a major effect on our operations and financial results. Accordingly, the revenues and expenses associated with this business are presented as a component of income (loss) from continuing operations in our Condensed Consolidated Statements of Operations for the three months ended March 31, 2019 and 2018, respectively, and the cash flows associated with this business are presented as a component of cash flows from continuing operations in our Condensed Consolidated Statements of Cash Flows for the three months ended March 31, 2019 and 2018, respectively, through the closing date of the Consumer Storage Transaction. As a result of the Consumer Storage Transaction, we recorded a gain on sale of approximately $4,200 to Other expense (income), net, in the first quarter of 2019, representing the excess of the fair value of the consideration received over the sum of (i) the carrying value of our consumer storage operations and (ii) the Cash Contribution. At the closing date of the Consumer Storage Transaction, the fair value of the Makespace Investment was approximately $27,500 and is presented as a component of Other within Other assets, net in our Condensed Consolidated Balance Sheet as of March 31, 2019. We account for the Makespace Investment as an equity method investment.

Significant Acquisition Costs

Significant Acquisition Costs	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Recall Costs	Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations are as follows: Three Months Ended 2019 2018 Cost of sales (excluding depreciation and amortization) $ 898 $ 296 Selling, general and administrative expenses 1,848 18,712 Total Significant Acquisition Costs $ 2,746 $ 19,008 Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations by segment are as follows: Three Months Ended 2019 2018 North American Records and Information Management Business $ 378 $ 584 North American Data Management Business — — Western European Business — 2,152 Other International Business 502 537 Global Data Center Business 143 10,181 Corporate and Other Business 1,723 5,554 Total Significant Acquisition Costs $ 2,746 $ 19,008

Related Party Transactions

Related Party Transactions	3 Months Ended
	Mar. 31, 2019
Related Party Transactions [Abstract]
Related Party Transactions	In connection with the Consumer Storage Transaction and the Makespace Investment (both as described more fully in Note 9), we also entered into a storage and service agreement with the Makespace JV to provide certain storage and related services to the Makespace JV (the "Makespace Agreement"). Revenues and expenses associated with the Makespace Agreement are presented as a component of our North American Records and Information Management Business segment. For the three months ended March 31, 2019, we recognized an immaterial amount of revenue associated with the Makespace Agreement.

Summary of Significant Accoun_2

Summary of Significant Accounting Policies (Policies)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Lessee, Leases [Policy Text Block]	Leases We lease facilities for certain warehouses, data centers and office space. We also have land leases, including those on which certain facilities are located. The majority of our leased facilities are classified as operating leases that, on average, have initial lease terms of five to 10 years, with one or more lease renewal options to extend the lease term. Our lease renewal option terms generally range from one to five years. The exercise of the lease renewal option is at our sole discretion and may contain fixed rent, fair market value based rent or Consumer Price Index rent escalation clauses. We include option periods in the lease term when our failure to renew the lease would result in an economic disincentive, thereby making it reasonably certain that we will renew the lease. We recognize straight line rental expense over the life of the lease and any fair market value or Consumer Price Index rent escalations are recognized as variable lease expense in the period in which the obligation is incurred. In addition, we lease certain vehicles and equipment. Vehicle and equipment leases have lease terms ranging from one to seven years. The lease right-of-use assets and related lease liabilities are classified as either operating or financing. Lease right-of-use assets are calculated as the net present value of future payments plus any capitalized initial direct costs less any tenant improvements or lease incentives. Lease liabilities are calculated as the net present value of future payments. In calculating the present value of the lease payments, we will utilize the rate stated within the lease (in the limited circumstances when such rate is available) or, if no rate is explicitly stated, we have elected to utilize a rate that reflects our securitized incremental borrowing rate by geography for the lease term. In July 2018, the FASB issued ASU 2018-11, Leases - Targeted Improvements ("ASU 2018-11"). ASU 2018-11 provides a practical expedient which allows lessees to account for nonlease components (which include common area maintenance, taxes, and insurance) with the related lease component. Any variable nonlease components are not included within the lease right-of-use asset and lease liability on the Condensed Consolidated Balance Sheets, and instead, are reflected as an expense in the period incurred. We have elected to take this practical expedient upon adoption of ASU 2016-02.
Cash, Cash Equivalents and Restricted Cash	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.
Revenue Recognition, Policy [Policy Text Block]	Revenues
Goodwill and Other Intangible Assets	Finite-lived Intangible Assets and Liabilities Finite-lived intangible assets and liabilities are primarily comprised of customer relationship intangible assets, customer inducements and data center intangible assets and liabilities (which include data center in-place lease intangible assets, data center tenant relationship intangible assets, data center above-market in-place lease intangible assets and data center below-market in-place lease intangible assets). Since December 31, 2018, there have been no changes to our accounting policies related to the accounting for any of our finite-lived intangible assets and liabilities as disclosed in Note 2.i. to Notes to Consolidated Financial Statements included in our Annual Report.
Stock-Based Compensation	For our Employee Stock-Based Awards made on or after February 20, 2019, we have included the following retirement provision: Upon an employee’s retirement on or after attaining age 58, if the sum of (i) the award recipient’s age at retirement and (ii) the award recipient’s years of service with the company totals at least 70, the award recipient is entitled to continued vesting of any outstanding Employee Stock-Based Awards which include the 2019 Retirement Criteria subsequent to their retirement, provided that, for awards granted in the year of retirement, their retirement occurs on or after July 1st (the “2019 Retirement Criteria”). Accordingly, (i) grants of Employee Stock-Based Awards to an employee who has met the 2019 Retirement Criteria on or before the date of grant, or will meet the Retirement Criteria before July 1 st of the year of the grant, will be expensed between the date of grant and July 1 st of the grant year and (ii) grants of Employee Stock-Based Awards to employees who will meet the 2019 Retirement Criteria during the award’s normal vesting period will be expensed between the date of grant and the date upon which the award recipient meets the 2019 Retirement Criteria. Stock options and RSUs granted to recipients who meet the 2019 Retirement Criteria will continue vesting on the original vesting schedule, and the stock options will remain exercisable up to three years after retirement, or the original expiration date of the stock options, if earlier. PUs granted to recipients who meet the 2019 Retirement Criteria will continue to vest and be delivered in accordance with the original vesting schedule of the applicable PU award and remain subject to the same performance conditions. 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 (together, "Employee Stock-Based Awards").
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 rates for the years ending December 31, 2019 and 2018 reflect the impact of the U.S. tax reform legislation, commonly referred to as the Tax Cuts and Jobs Act (the “Tax Reform Legislation”). See Note 7 to Notes to Consolidated Financial Statements included in our Annual Report for additional information regarding the impact the Tax Reform Legislation had on us. 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	Data Center Lessor Considerations Our data center business features storage rental provided to customers at contractually specified rates over a fixed contractual period. Prior to January 1, 2019, our data center revenue contracts were accounted for in accordance with Accounting Standards Codification (“ASC”) No. 840, Leases ("ASC 840"). On January 1, 2019, we adopted ASU 2016-02, as described in more detail in Note 2.d. Beginning on January 1, 2019, our data center revenue contracts will be accounted for in accordance with ASU 2016-02. ASU 2016-02 provides a practical expedient which allows lessors to account for nonlease components (such as power and connectivity, in the case of our data center business) with the related lease component if both the timing and pattern of transfer are the same for nonlease components and the lease component, and the lease component would be classified as an operating lease. The single combined component is accounted for under ASU 2016-02 if the lease component is the predominant component and is accounted for under ASU No. 2014-09, Revenue from Contracts with Customers (Topic 606) ("ASU 2014-09"), if the nonlease components are the predominant components. New Accounting Pronouncements In August 2018, the FASB issued ASU No. 2018-15, Intangibles-Goodwill and Other-Internal-Use Software (Subtopic 350-40): Customer’s Accounting for Implementation Costs Incurred in a Cloud Computing Arrangement That Is a Service Contract (a consensus of the FASB Emerging Issues Task Force) ("ASU 2018-15"). ASU 2018-15 aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance on capitalizing costs associated with developing or obtaining internal-use software. We adopted ASU 2018-15 on January 1, 2019. ASU 2018-15 did not have a material impact on our consolidated financial statements. In February 2016, the FASB issued ASU 2016-02. We adopted ASU 2016-02 on January 1, 2019 on a modified retrospective basis. See Note 2.d. for information regarding the impact of the adoption of ASU 2016-02 on our consolidated financial statements. Change in Presentation Subsequent to our conversion to a REIT, we have historically classified gains on sale of real estate, net of tax, as a separate line on our consolidated statements of operations and excluded such amounts from our reported operating income. We presented such amounts net of tax as these gains were presented below the provision (benefit) for income taxes on our consolidated statements of operations. Commencing with the first quarter of 2019, we will present gains on sale of real estate as a component of operating income in the line item loss (gain) on disposal/write down of property, plant and equipment, net. Such amounts will be presented gross of tax with any tax impact presented within provision (benefit) for income taxes. All prior periods will be conformed to this presentation going forward. No gains on the sale of real estate were recognized during the three months ended March 31, 2019 or 2018.

Summary of Significant Accoun_3

Summary of Significant Accounting Policies (Tables)	3 Months Ended
	Mar. 31, 2019
Accounting Policies [Abstract]
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]	Our effective tax rates for the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019(1) 2018(2) Effective Tax Rate 25.7 % 2.5 % _______________________________________________________________________________ (1) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended March 31, 2019 were the benefit derived from the dividends paid deduction and the impact of differences in the tax rates at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates. (2) The primary reconciling items between the federal statutory tax rate of 21.0% and our overall effective tax rate for the three months ended March 31, 2018 were the benefit derived from the dividends paid deduction, a discrete tax benefit of approximately $14,000 associated with the resolution of a tax matter and the impact of differences in the tax rates at which our foreign earnings are subject, including foreign exchange gains and losses in different jurisdictions with different tax rates.
Schedule of New Accounting Pronouncements and Changes in Accounting Principles	Deferred revenue liabilities are reflected as follows in our Condensed Consolidated Balance Sheets: Description Location in Balance Sheet March 31, 2019 December 31, 2018 Deferred revenue - Current Deferred revenue $ 266,314 $ 264,823 Deferred revenue - Long-term Other Long-term Liabilities 25,625 26,401 The costs of the initial intake of customer records into physical storage ("Intake Costs") and capitalized commissions asset (collectively, "Contract Fulfillment Costs") as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Description Location in Balance Sheet Gross Carrying Amount Accumulated Amortization Net Carrying Amount Gross Carrying Amount Accumulated Amortization Net Carrying Amount Intake Costs asset Other (within Other Assets, Net) $ 36,155 $ (21,041 ) $ 15,114 $ 39,748 $ (24,504 ) $ 15,244 Capitalized commissions asset Other (within Other Assets, Net) 52,485 (24,923 ) 27,562 58,424 (34,637 ) 23,787
Schedule of amortization expense associated with commissions asset and Intake Costs	Amortization expense associated with the Intake Costs asset and capitalized commissions asset for the three months ended March 31, 2019 and 2018 are as follows: Three Months Ended 2019 2018 Intake Costs asset $ 2,679 $ 2,730 Capitalized commissions asset 3,946 3,587
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, 2019 are as follows: North American North American Western European Business Other International Business Global Data Center Business Corporate and Other Business Total Goodwill balance, net of accumulated amortization as of December 31, 2018 $ 2,251,795 $ 493,491 $ 381,806 $ 818,223 $ 425,956 $ 69,759 $ 4,441,030 Deductible goodwill acquired during the year 5,501 — — — — — 5,501 Non-deductible goodwill acquired during the year — — 4,991 3,767 — 1,874 10,632 Fair value and other adjustments(1) 31 — 92 3,350 (871 ) (468 ) 2,134 Currency effects 3,921 1,067 1,393 1,126 (1,566 ) 140 6,081 Goodwill balance, net accumulated amortization as of March 31, 2019 $ 2,261,248 $ 494,558 $ 388,282 $ 826,466 $ 423,519 $ 71,305 $ 4,465,378 Accumulated Goodwill Impairment Balance as of December 31, 2018 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 Accumulated Goodwill Impairment Balance as of March 31, 2019 $ 85,909 $ — $ 46,500 $ — $ — $ 3,011 $ 135,420 _______________________________________________________________________________ (1) Total fair value and other adjustments primarily include $2,565 in net adjustments related to property, plant and equipment, customer relationships and data center lease-based intangible assets and deferred income taxes and other liabilities offset by $431 of cash received related to certain acquisitions completed in 2018.
Components of amortizable intangible assets	The other finite-lived intangible assets as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Other finite-lived intangible assets (included in Other, a component of other assets, net) $ 20,290 $ (15,794 ) $ 4,496 $ 20,310 $ (14,798 ) $ 5,512 The gross carrying amount and accumulated amortization of our finite-lived intangible assets as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Carrying Accumulated Net Carrying Gross Carrying Accumulated Net Carrying Assets: Customer relationship intangible assets $ 1,754,794 $ (482,971 ) $ 1,271,823 $ 1,718,919 $ (455,705 ) $ 1,263,214 Customer inducements 51,405 (28,711 ) 22,694 56,478 (34,181 ) 22,297 Data center lease-based intangible assets(1) 265,834 (65,013 ) 200,821 271,818 (50,807 ) 221,011 Third-party commissions asset(2) 30,861 (737 ) 30,124 30,071 (1,089 ) 28,982 $ 2,102,894 $ (577,432 ) $ 1,525,462 $ 2,077,286 $ (541,782 ) $ 1,535,504 Liabilities: Data center below-market leases $ 12,715 $ (2,451 ) $ 10,264 $ 12,318 $ (1,642 ) $ 10,676 _______________________________________________________________________________ (1) Includes data center in-place lease intangible assets, data center tenant relationship intangible assets and data center above-market in-place lease intangible assets. (2) Third-party commissions asset is included in Other, a component of Other assets, net in the accompanying Condensed Consolidated Balance Sheets as of March 31, 2019 and December 31, 2018. The third-party commissions asset is primarily comprised of additional payments associated with the execution of future customer contracts through the one-year anniversary of the acquisition of IODC, as described in Note 3.
Schedule of amortization expenses	Amortization expense associated with finite-lived intangible assets, revenue reduction associated with the amortization of customer inducements 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, 2019 and 2018 are as follows: Three Months Ended March 31, 2019 2018 Amortization expense included in depreciation and amortization associated with: Customer relationship and customer inducement intangible assets $ 27,881 $ 28,806 Data center in-place leases and tenant relationships 12,609 10,838 Third-party commissions asset and other finite-lived intangible assets 757 1,185 Revenue reduction associated with amortization of: Customer inducements $ 2,740 $ 2,585 Data center above-market leases and data center below-market leases 905 1,079
Operating and financing lease right-of-use assets and lease liabilities	Operating and financing lease right-of-use assets and lease liabilities as of March 31, 2019 and January 1, 2019 (date of adoption of ASU 2016-02) are as follows: Description Location in Balance Sheet March 31, 2019 January 1, 2019 Assets: Operating lease right-of-use assets(1) Operating lease right-of-use assets $ 1,791,536 $ 1,825,721 Financing lease right-of-use assets, net of accumulated depreciation(2) Property, plant and equipment, net 351,750 361,078 Total $ 2,143,286 $ 2,186,799 Liabilities: Current Operating lease liabilities Accrued expenses and other current liabilities $ 206,286 $ 209,911 Financing lease liabilities Current portion of long-term debt 51,222 50,437 Total current lease liabilities 257,508 260,348 Long-term Operating lease liabilities Long-term operating lease liabilities, net of current portion 1,656,659 1,685,771 Financing lease liabilities Long-term Debt, net of current portion 338,728 350,263 Total long-term lease liabilities 1,995,387 2,036,034 Total $ 2,252,895 $ 2,296,382 ______________________________________________________________ (1) At March 31, 2019, these assets are comprised of approximately 98% real estate related assets (which include land, buildings and racking) and 2% non-real estate related assets (which include warehouse equipment, vehicles, furniture and fixtures and computer hardware and software). (2) At March 31, 2019, these assets are comprised of approximately 66% real estate related assets and 34% non-real estate related assets.
Lease, Cost [Table Text Block]	Supplemental cash flow information relating to our leases for the three months ended March 31, 2019 is as follows: Cash paid for amounts included in measurement of lease liabilities: Three Months Ended Operating cash flows used in operating leases $ 83,676 Financing cash flows used in financing leases $ 16,675 Non-cash items: Operating lease modifications and reassessments $ 1,842 New operating leases (including acquisitions) $ 21,535 Financing lease modifications and reassessments $ — New financing leases $ 7,523 Weighted average remaining lease terms and discount rates as of March 31, 2019 are as follows: Remaining Lease Term: Operating leases 11.1 Years Financing leases 11.0 Years Discount Rate: Operating leases 7.1% Financing leases 5.7% The components of the lease expense for the three months ended March 31, 2019 is as follows: Description Location in Statement of Operations Amount Operating lease cost(1) Cost of sales and Selling, general and administrative $ 111,906 Financing lease cost: Depreciation of financing lease right-of-use assets Depreciation and amortization $ 16,329 Interest expense for financing lease liabilities Interest expense, net 6,142 Total financing lease cost $ 22,471 ______________________________________________________________ (1) Of the $111,906 of operating lease cost incurred for the three months ended March 31, 2019, $108,601 is included within Cost of sales and $3,305 is included within Selling, general and administrative expenses. Operating lease cost includes variable lease costs of $25,489 .
Schedule of Future Minimum Lease Payments for Capital Leases [Table Text Block]	The estimated minimum future lease payments as of December 31, 2018, are as follows: Year Operating Leases(1) Sublease Income Capital Leases(1)(2) 2019 $ 323,454 $ (7,525 ) $ 80,513 2020 293,276 (7,200 ) 71,335 2021 267,379 (7,063 ) 61,269 2022 246,128 (6,694 ) 52,832 2023 221,808 (6,409 ) 44,722 Thereafter 1,287,807 (6,279 ) 377,750 Total minimum lease payments 2,639,852 $ (41,170 ) 688,421 Less amounts representing interest (241,248 ) Present value of finance lease obligations $ 447,173
Schedule of Future Minimum Rental Payments for Operating Leases [Table Text Block]	The estimated minimum future lease payments as of December 31, 2018, are as follows: Year Operating Leases(1) Sublease Income Capital Leases(1)(2) 2019 $ 323,454 $ (7,525 ) $ 80,513 2020 293,276 (7,200 ) 71,335 2021 267,379 (7,063 ) 61,269 2022 246,128 (6,694 ) 52,832 2023 221,808 (6,409 ) 44,722 Thereafter 1,287,807 (6,279 ) 377,750 Total minimum lease payments 2,639,852 $ (41,170 ) 688,421 Less amounts representing interest (241,248 ) Present value of finance lease obligations $ 447,173 The estimated minimum future lease payments as of March 31, 2019, are as follows: Year Operating Leases(1) Sublease Income Financing Leases(1) 2019 (excluding the three months ended March 31, 2019) $ 251,699 $ (6,039 ) $ 59,411 2020 308,267 (7,337 ) 68,333 2021 280,931 (7,228 ) 59,710 2022 257,598 (6,851 ) 49,997 2023 234,035 (6,548 ) 39,643 Thereafter 1,409,241 (6,922 ) 287,609 Total minimum lease payments 2,741,771 $ (40,925 ) 564,703 Less amounts representing interest or imputed interest (878,826 ) (174,753 ) Present value of lease obligations 1,862,945 $ 389,950 _______________________________________________________________________________ (1) Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2018 and March 31, 2019 are primarily related to adjustments to account for certain build to suit leases that were accounted for as financing obligations under ASC 840 but are accounted for as operating leases under ASU 2016-02 and foreign currency exchange rate impacts. (2) Includes capital lease and financing obligations associated with build to suit lease transactions at December 31, 2018.
Finance Lease, Liability, Maturity [Table Text Block]	The estimated minimum future lease payments as of March 31, 2019, are as follows: Year Operating Leases(1) Sublease Income Financing Leases(1) 2019 (excluding the three months ended March 31, 2019) $ 251,699 $ (6,039 ) $ 59,411 2020 308,267 (7,337 ) 68,333 2021 280,931 (7,228 ) 59,710 2022 257,598 (6,851 ) 49,997 2023 234,035 (6,548 ) 39,643 Thereafter 1,409,241 (6,922 ) 287,609 Total minimum lease payments 2,741,771 $ (40,925 ) 564,703 Less amounts representing interest or imputed interest (878,826 ) (174,753 ) Present value of lease obligations 1,862,945 $ 389,950 _______________________________________________________________________________ (1) Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2018 and March 31, 2019 are primarily related to adjustments to account for certain build to suit leases that were accounted for as financing obligations under ASC 840 but are accounted for as operating leases under ASU 2016-02 and foreign currency exchange rate impacts.
Lessee, Operating Lease, Liability, Maturity [Table Text Block]	The estimated minimum future lease payments as of March 31, 2019, are as follows: Year Operating Leases(1) Sublease Income Financing Leases(1) 2019 (excluding the three months ended March 31, 2019) $ 251,699 $ (6,039 ) $ 59,411 2020 308,267 (7,337 ) 68,333 2021 280,931 (7,228 ) 59,710 2022 257,598 (6,851 ) 49,997 2023 234,035 (6,548 ) 39,643 Thereafter 1,409,241 (6,922 ) 287,609 Total minimum lease payments 2,741,771 $ (40,925 ) 564,703 Less amounts representing interest or imputed interest (878,826 ) (174,753 ) Present value of lease obligations 1,862,945 $ 389,950 _______________________________________________________________________________ (1) Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2018 and March 31, 2019 are primarily related to adjustments to account for certain build to suit leases that were accounted for as financing obligations under ASC 840 but are accounted for as operating leases under ASU 2016-02 and foreign currency exchange rate impacts.
Stock-based compensation expense for Employee Stock-Based Awards related to continuing operations	.
Summary of stock option activity	A summary of stock option activity for the three months ended March 31, 2019 is as follows: Stock Options Outstanding at December 31, 2018 4,271,834 Granted 920,706 Exercised (99,334 ) Forfeited (6,007 ) Expired (9,629 ) Outstanding at March 31, 2019 5,077,570 Options exercisable at March 31, 2019 3,258,982 Options expected to vest 1,691,146
Summary of restricted stock and RSU activity	The fair value of RSUs vested during the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Fair value of RSUs vested $ 15,333 $ 15,330 A summary of RSU activity for the three months ended March 31, 2019 is as follows: RSUs Non-vested at December 31, 2018 1,196,566 Granted 621,281 Vested (453,167 ) Forfeited (18,075 ) Non-vested at March 31, 2019 1,346,605
Schedule of performance units	The fair value of earned PUs that vested during the three months ended March 31, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Fair value of earned PUs that vested $ 6,503 $ 3,033
Summary of Performance Unit (PU) activity	A summary of PU activity for the three months ended March 31, 2019 is as follows: Original PU Adjustment(1) Total Non-vested at December 31, 2018 967,049 (299,948 ) 667,101 Granted 380,856 — 380,856 Vested (169,523 ) — (169,523 ) Forfeited/Performance or Market Conditions Not Achieved (4,816 ) (14,850 ) (19,666 ) Non-vested at March 31, 2019 1,173,566 (314,798 ) 858,768 _______________________________________________________________________________ (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, 2019 and 2018 is as follows: Three Months Ended 2019 2018 Income (loss) from continuing operations $ 30,476 $ 45,614 Less: Net income (loss) attributable to noncontrolling interests 891 468 Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) $ 29,585 $ 45,146 (Loss) income from discontinued operations, net of tax $ (24 ) $ (462 ) Net income (loss) attributable to Iron Mountain Incorporated $ 29,561 $ 44,684 Weighted-average shares—basic 286,528,000 285,259,000 Effect of dilutive potential stock options 231,402 249,564 Effect of dilutive potential RSUs and PUs 732,421 484,314 Weighted-average shares—diluted 287,491,823 285,992,878 Earnings (losses) per share—basic: Income (loss) from continuing operations $ 0.10 $ 0.16 (Loss) income from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.10 $ 0.16 Earnings (losses) per share—diluted: Income (loss) from continuing operations $ 0.10 $ 0.16 (Loss) income from discontinued operations, net of tax — — Net income (loss) attributable to Iron Mountain Incorporated(1) $ 0.10 $ 0.16 Antidilutive stock options, RSUs and PUs, excluded from the calculation 3,985,161 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 March 31, 2019 and December 31, 2018 , respectively, are as follows: Fair Value Measurements at Description Total Carrying Quoted prices Significant other Significant Money Market Funds(1) $ 1,739 $ — $ 1,739 $ — Trading Securities 10,160 9,490 (2) 670 (3) — Derivative Assets (4) 23 — 23 — Derivative Liabilities(4) 109 — 109 — Interest Rate Swap Agreements Liabilities(5) 3,647 — 3,647 — Fair Value Measurements at Description Total Carrying Value at December 31, 2018 Quoted prices in active markets (Level 1) Significant other observable inputs (Level 2) Significant unobservable inputs (Level 3) Time Deposits(1) $ 956 $ — $ 956 $ — Trading Securities 10,753 10,248 (2) 505 (3) — Derivative Assets(4) 93 — 93 — Interest Rate Swap Agreements Liabilities(5) 973 — 973 — _______________________________________________________________________________ (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. 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. As of March 31, 2019, we had outstanding forward contracts to (i) purchase 4,000 Euros and sell $4,610 United States dollars and (ii) purchase $4,515 United States dollars and sell 4,000 Euros. As of December 31, 2018, we had outstanding forward contracts to purchase 29,000 Euros and sell $33,374 United States dollars. We have not designated any of the forward contracts we have entered into as hedges. (5) We have 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, 2019 and December 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.
Schedule of changes in accumulated other comprehensive items, net	The changes in accumulated other comprehensive items, net for the three months ended March 31, 2019 and 2018 are as follows: Three Months Ended March 31, 2019 2018 Foreign Fair Value Adjustments for Interest Rate Swap Agreements Total Foreign Fair Value Adjustments for Interest Rate Swap Agreements Total Beginning of Period $ (264,691 ) $ (973 ) $ (265,664 ) $ (103,989 ) $ — $ (103,989 ) Other comprehensive income (loss): Foreign currency translation adjustments(1) 17,378 — 17,378 30,092 — 30,092 Fair value adjustments for interest rate swap agreements — (2,674 ) (2,674 ) — (185 ) (185 ) Total other comprehensive income (loss) 17,378 (2,674 ) 14,704 30,092 (185 ) 29,907 End of Period $ (247,313 ) $ (3,647 ) $ (250,960 ) $ (73,897 ) $ (185 ) $ (74,082 ) ______________________________________________________________ (1) This amount includes foreign exchange (gains) losses of $(6,141) and $5,635 for the three months ended March 31, 2019 and 2018, respectively, related to the change in fair value of the portion of our Euro Notes (as defined and discussed more fully in Note 4) designated as a hedge of net investment of certain of our Euro denominated subsidiaries. For the three months ended March 31, 2019, we designated, on average, 271,146 Euros of our Euro Notes 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 of March 31, 2019, cumulative net gains of $20,399 net of tax, are recorded in accumulated other comprehensive items, net associated with this net investment hedge.
Other expense (income), net	Other expense (income), net for the three months ended March 31, 2019 and 2018 consists of the following: Three Months Ended 2019 2018 Foreign currency transaction losses (gains), net $ 17,697 $ 21,785 Other, net (2,487 ) (1,634 ) $ 15,210 $ 20,151

Acquisitions (Tables)

Acquisitions (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Business Acquisition, Pro Forma Information	Three Months Ended March 31, 2018 Total Revenues $ 1,045,948 Income from Continuing Operations $ 55,566 Per Share Income from Continuing Operations - Basic $ 0.20 Per Share Income from Continuing Operations - Diluted $ 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 2019 acquisitions through March 31, 2019 is as follows: Three Months Ended Cash Paid (gross of cash acquired)(1) $ 34,198 Purchase Price Holdbacks and Other 1,042 Total Consideration 35,240 Fair Value of Identifiable Assets Acquired: Cash 2,273 Accounts Receivable, Prepaid Expenses and Other Assets 2,845 Property, Plant and Equipment(2) 4,039 Customer Relationship Intangible Assets 13,589 Operating Lease Right-of-Use Assets 10,541 Accounts Payable, Accrued Expenses and Other Liabilities (2,065 ) Operating Lease Liabilities (10,541 ) Deferred Income Taxes (1,574 ) Total Fair Value of Identifiable Net Assets Acquired 19,107 Goodwill Initially Recorded(3) $ 16,133 _______________________________________________________________________________ (1) Included in cash paid for acquisitions in the Condensed Consolidated Statement of Cash Flows for the three months ended March 31, 2019 is net cash acquired of $2,273 and contingent and other payments, net of $7,498 related to acquisitions made in previous years. (2) Consists primarily of 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, 2019
Debt Disclosure [Abstract]
Schedule Of Net Cash Position In Cash Pool Agreements [Table Text Block]	The approximate amount of the net cash position for our QRS Cash Pool and the TRS Cash Pool and the approximate amount of the gross position and outstanding debit balances for each of these pools as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Gross Cash Position Outstanding Debit Balances Net Cash Position Gross Cash Position Outstanding Debit Balances Net Cash Position QRS Cash Pool $ 271,400 $ (269,400 ) $ 2,000 $ 300,800 $ (298,800 ) $ 2,000 TRS Cash Pool 281,100 (277,900 ) 3,200 $ 281,500 (279,300 ) 2,200
Schedule of carrying amount and fair value of long-term debt instruments	Long-term debt is as follows: March 31, 2019 December 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(1) $ 1,139,566 $ (13,332 ) $ 1,126,234 $ 1,139,566 $ 793,832 $ (14,117 ) $ 779,715 $ 793,832 Term Loan A(1) 237,500 — 237,500 237,500 240,625 — 240,625 240,625 Term Loan B(2) 691,476 (8,430 ) 683,046 670,478 693,169 (8,742 ) 684,427 660,013 Australian Dollar Term Loan (the "AUD Term Loan")(3) 234,000 (2,893 ) 231,107 235,587 233,955 (3,084 ) 230,871 235,645 UK Bilateral Revolving Credit Facility ("UK Bilateral Facility")(4) 182,450 (2,255 ) 180,195 182,450 178,299 (2,357 ) 175,942 178,299 4 3 / 8 % Senior Notes due 2021 (the "4 3 / 8 % Notes")(5) 500,000 (3,725 ) 496,275 502,500 500,000 (4,155 ) 495,845 488,750 6% Senior Notes due 2023 (the "6% Notes due 2023")(5) 600,000 (4,851 ) 595,149 615,000 600,000 (5,126 ) 594,874 606,000 5 3 / 8 % CAD Senior Notes due 2023 (the "CAD Notes") 187,262 (2,424 ) 184,838 189,444 183,403 (2,506 ) 180,897 186,154 5 3 / 4 % Senior Subordinated Notes due 2024 (the "5 3 / 4 % Notes")(5) 1,000,000 (7,439 ) 992,561 1,010,000 1,000,000 (7,782 ) 992,218 940,000 3% Euro Senior Notes due 2025 (the "Euro Notes")(5) 336,557 (3,941 ) 332,616 337,684 343,347 (4,098 ) 339,249 321,029 3 7 / 8 % GBP Senior Notes due 2025 (the "GBP Notes") 521,286 (6,480 ) 514,806 495,852 509,425 (6,573 ) 502,852 453,811 5 3 / 8 % Senior Notes due 2026 (the "5 3 / 8 % Notes") 250,000 (3,078 ) 246,922 246,875 250,000 (3,185 ) 246,815 224,375 4 7 / 8 % Senior Notes due 2027 (the "4 7 / 8 % Notes")(5) 1,000,000 (12,086 ) 987,914 957,500 1,000,000 (12,442 ) 987,558 855,000 5 1 / 4 % Senior Notes due 2028 (the "5 1 / 4 % Notes")(5) 825,000 (10,628 ) 814,372 798,188 825,000 (10,923 ) 814,077 713,625 Real Estate Mortgages, Financing Lease Liabilities and Other 566,677 (431 ) 566,246 566,677 606,702 (171 ) 606,531 606,702 Accounts Receivable Securitization Program(6) 252,373 (184 ) 252,189 252,373 221,673 (218 ) 221,455 221,673 Mortgage Securitization Program(7) 50,000 (1,091 ) 48,909 50,000 50,000 (1,128 ) 48,872 50,000 Total Long-term Debt 8,574,147 (83,268 ) 8,490,879 8,229,430 — (86,607 ) 8,142,823 Less Current Portion (125,142 ) — (125,142 ) (126,406 ) — (126,406 ) Long-term Debt, Net of Current Portion $ 8,449,005 $ (83,268 ) $ 8,365,737 $ 8,103,024 $ (86,607 ) $ 8,016,417 ______________________________________________________________ (1) Collectively, the credit agreement ("Credit Agreement"). The Credit Agreement consists of a revolving credit facility (the "Revolving Credit Facility") and a term loan (the "Term Loan A"). The Credit Agreement is scheduled to mature on June 3, 2023. Of the $1,139,566 of outstanding borrowings under the Revolving Credit Facility as of March 31, 2019, 965,800 was denominated in United States dollars, 94,200 was denominated in Canadian dollars and 92,000 was denominated in Euros. In addition, we also had various outstanding letters of credit totaling $37,271 . The remaining amount available for borrowing under the Revolving Credit Facility as of March 31, 2019 was $573,163 (which amount represents the maximum availability as of such date). The average interest rate in effect under the Credit Agreement was 4.0% as of March 31, 2019 . The average interest rate in effect under the Revolving Credit Facility as of March 31, 2019 was 4.0% and the interest rate in effect under Term Loan A as of March 31, 2019 was 4.2% . (2) In connection with the 2018 First Amendment (as defined in Note 5 to Notes to Consolidated Financial Statements included in our Annual Report), Iron Mountain Information Management, LLC ("IMIM") entered into an incremental term loan activation notice (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, IMIM borrowed the full amount of the Term Loan B. The Term Loan B is scheduled to mature on January 2, 2026. The interest rate in effect as of March 31, 2019 was 4.3% . The amount of debt for the Term Loan B reflects an unamortized original issue discount of $1,524 and $1,581 as of March 31, 2019 and December 31, 2018, respectively. (3) The interest rate in effect as of March 31, 2019 was 5.7% . We had 331,875 Australian dollars outstanding on the AUD Term Loan as of March 31, 2019. The amount of debt for the AUD Term Loan reflects an unamortized original issue discount of $1,587 and $1,690 as of March 31, 2019 and December 31, 2018, respectively. (4) The interest rate in effect as of March 31, 2019 was 3.2% . (5) Collectively, the "Parent Notes". (6) The interest rate in effect as of March 31, 2019 was 3.5% . (7) The interest rate in effect as of March 31, 2019 was 3.5% .
Schedule of Leverage and Fixed Charge Ratios	Our leverage and fixed charge coverage ratios under the Credit Agreement as of March 31, 2019 and December 31, 2018, as well as our leverage ratio under our indentures as of March 31, 2019 and December 31, 2018 are as follows: March 31, 2019 December 31, 2018 Maximum/Minimum Allowable Net total lease adjusted leverage ratio 5.8 5.6 Maximum allowable of 6.5 Net secured debt lease adjusted leverage ratio 2.8 2.6 Maximum allowable of 4.0 Bond leverage ratio (not lease adjusted) 6.1 5.8 Maximum allowable of 6.5-7.0(1) Fixed charge coverage ratio 2.2 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 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.

Selected Consolidated Financi_2

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors (Tables)	3 Months Ended
	Mar. 31, 2019
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	CONDENSED CONSOLIDATED BALANCE SHEETS March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 11 $ 122,114 $ 109,991 $ (70,641 ) $ 161,475 Accounts receivable — 37,598 799,923 — 837,521 Intercompany receivable — 1,032,582 — (1,032,582 ) — Prepaid expenses and other — 110,223 100,660 (29 ) 210,854 Total Current Assets 11 1,302,517 1,010,574 (1,103,252 ) 1,209,850 Property, Plant and Equipment, Net 168 2,999,744 1,525,671 — 4,525,583 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 5,009,984 — — (5,009,984 ) — Investment in subsidiaries 1,926,435 1,017,247 — (2,943,682 ) — Goodwill — 2,857,855 1,607,523 — 4,465,378 Operating lease right-of-use assets — 895,920 895,616 — 1,791,536 Other 5 976,403 720,608 — 1,697,016 Total Other Assets, Net 6,936,424 5,747,425 3,223,747 (7,953,666 ) 7,953,930 Total Assets $ 6,936,603 $ 10,049,686 $ 5,759,992 $ (9,056,918 ) $ 13,689,363 Liabilities and Equity Intercompany Payable $ 729,843 $ — $ 302,739 $ (1,032,582 ) $ — Debit Balances Under Cash Pools — — 70,641 (70,641 ) — Current Portion of Long-Term Debt — 55,940 69,231 (29 ) 125,142 Total Other Current Liabilities (includes current portion of operating lease liabilities) 224,825 632,699 532,467 — 1,389,991 Long-Term Debt, Net of Current Portion 4,218,887 2,212,686 1,934,164 — 8,365,737 Long-Term Operating Lease Liabilities, Net of Current Portion — 832,007 824,652 — 1,656,659 Long-Term Notes Payable to Affiliates and Intercompany Payable — 5,009,984 — (5,009,984 ) — Other Long-term Liabilities 3,647 51,575 262,776 — 317,998 Commitments and Contingencies (See Note 7) Redeemable Noncontrolling Interests — — 73,102 — 73,102 Total Iron Mountain Incorporated Stockholders' Equity 1,759,401 1,254,795 1,688,887 (2,943,682 ) 1,759,401 Noncontrolling Interests — — 1,333 — 1,333 Total Equity 1,759,401 1,254,795 1,690,220 (2,943,682 ) 1,760,734 Total Liabilities and Equity $ 6,936,603 $ 10,049,686 $ 5,759,992 $ (9,056,918 ) $ 13,689,363 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at March 31, 2019 is approximately $76,000 and $0 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively. CONDENSED CONSOLIDATED BALANCE SHEETS (Continued) December 31, 2018 Parent Guarantors Non- Eliminations Consolidated Assets Current Assets: Cash and cash equivalents(1) $ 132 $ 61,650 $ 169,318 $ (65,615 ) $ 165,485 Accounts receivable — 47,900 798,989 — 846,889 Intercompany receivable — 818,463 — (818,463 ) — Prepaid expenses and other 93 108,879 86,797 (29 ) 195,740 Total Current Assets 225 1,036,892 1,055,104 (884,107 ) 1,208,114 Property, Plant and Equipment, Net 190 3,002,104 1,487,263 — 4,489,557 Other Assets, Net: Long-term notes receivable from affiliates and intercompany receivable 4,954,686 — — (4,954,686 ) — Investment in subsidiaries 1,885,174 1,006,144 — (2,891,318 ) — Goodwill — 2,858,539 1,582,491 — 4,441,030 Other — 979,483 734,063 — 1,713,546 Total Other Assets, Net 6,839,860 4,844,166 2,316,554 (7,846,004 ) 6,154,576 Total Assets $ 6,840,275 $ 8,883,162 $ 4,858,921 $ (8,730,111 ) $ 11,852,247 Liabilities and Equity Intercompany Payable $ 462,927 $ — $ 355,536 $ (818,463 ) $ — Debit Balances Under Cash Pools — 10,612 55,003 (65,615 ) — Current Portion of Long-Term Debt — 63,703 62,732 (29 ) 126,406 Total Other Current Liabilities 268,373 616,826 451,073 — 1,336,272 Long-Term Debt, Net of Current Portion 4,223,822 1,877,649 1,914,946 — 8,016,417 Long-Term Notes Payable to Affiliates and Intercompany Payable — 4,954,686 — (4,954,686 ) — Other Long-term Liabilities 973 115,994 300,064 — 417,031 Commitments and Contingencies (See Note 7) Redeemable Noncontrolling Interests — — 70,532 — 70,532 Total Iron Mountain Incorporated Stockholders' Equity 1,884,180 1,243,692 1,647,626 (2,891,318 ) 1,884,180 Noncontrolling Interests — — 1,409 — 1,409 Total Equity 1,884,180 1,243,692 1,649,035 (2,891,318 ) 1,885,589 Total Liabilities and Equity $ 6,840,275 $ 8,883,162 $ 4,858,921 $ (8,730,111 ) $ 11,852,247 ______________________________________________________________ (1) Included within Cash and Cash Equivalents at December 31, 2018 is approximately $57,200 and $12,700 of cash on deposit associated with our Cash Pools for the Guarantors and Non-Guarantors, respectively.
Schedule of selected consolidated Income statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Revenues: Storage rental $ — $ 403,741 $ 259,233 $ — $ 662,974 Service — 239,693 151,196 — 390,889 Intercompany revenues — 1,154 4,923 (6,077 ) — Total Revenues — 644,588 415,352 (6,077 ) 1,053,863 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 263,137 198,407 — 461,544 Intercompany — 4,923 1,154 (6,077 ) — Selling, general and administrative 87 187,822 82,650 — 270,559 Depreciation and amortization 23 102,954 59,506 — 162,483 (Gain) Loss on disposal/write-down of property, plant and equipment, net — 574 28 — 602 Total Operating Expenses 110 559,410 341,745 (6,077 ) 895,188 Operating (Loss) Income (110 ) 85,178 73,607 — 158,675 Interest Expense (Income), Net(1) 49,625 4,057 48,754 — 102,436 Other Expense (Income), Net 182 527 14,501 — 15,210 (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (49,917 ) 80,594 10,352 — 41,029 Provision (Benefit) for Income Taxes — 1,301 9,252 — 10,553 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (79,478 ) 4,158 — 75,320 — Income (Loss) from Continuing Operations 29,561 75,135 1,100 (75,320 ) 30,476 (Loss) Income from Discontinued Operations, Net of Tax — (24 ) — — (24 ) Net Income (Loss) 29,561 75,111 1,100 (75,320 ) 30,452 Less: Net Income (Loss) Attributable to Noncontrolling Interests — — 891 — 891 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 29,561 $ 75,111 $ 209 $ (75,320 ) $ 29,561 Net Income (Loss) $ 29,561 $ 75,111 $ 1,100 $ (75,320 ) $ 30,452 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments 6,141 — 12,050 — 18,191 Change in fair value of interest rate swap agreements (2,674 ) — — — (2,674 ) Equity in Other Comprehensive (Loss) Income of Subsidiaries 11,237 7,156 — (18,393 ) — Total Other Comprehensive Income (Loss) 14,704 7,156 12,050 (18,393 ) 15,517 Comprehensive Income (Loss) 44,265 82,267 13,150 (93,713 ) 45,969 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — 1,704 — 1,704 Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 44,265 $ 82,267 $ 11,446 $ (93,713 ) $ 44,265 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements. 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 Intercompany cost of sales — 4,491 1,205 (5,696 ) — Selling, general and administrative 43 185,348 84,339 — 269,730 Depreciation and amortization 33 102,446 58,099 — 160,578 (Gain) Loss on disposal/write-down of property, plant and equipment, net — (356 ) (774 ) — (1,130 ) Total Operating Expenses 76 538,092 345,427 (5,696 ) 877,899 Operating (Loss) Income (76 ) 89,819 74,816 — 164,559 Interest Expense (Income), Net(1) 49,941 (1,508 ) 49,193 — 97,626 Other (Income) Expense, 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 (Benefit) Provision 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 — (422 ) (40 ) — (462 ) Net Income (Loss) 44,684 93,192 (2,045 ) (90,679 ) 45,152 Less: Net Income (Loss) 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 Income (Loss) 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 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements.
Schedule of selected consolidated Comprehensive Income statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONDENSED CONSOLIDATED STATEMENTS OF OPERATIONS AND COMPREHENSIVE INCOME (LOSS) Three Months Ended March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Revenues: Storage rental $ — $ 403,741 $ 259,233 $ — $ 662,974 Service — 239,693 151,196 — 390,889 Intercompany revenues — 1,154 4,923 (6,077 ) — Total Revenues — 644,588 415,352 (6,077 ) 1,053,863 Operating Expenses: Cost of sales (excluding depreciation and amortization) — 263,137 198,407 — 461,544 Intercompany — 4,923 1,154 (6,077 ) — Selling, general and administrative 87 187,822 82,650 — 270,559 Depreciation and amortization 23 102,954 59,506 — 162,483 (Gain) Loss on disposal/write-down of property, plant and equipment, net — 574 28 — 602 Total Operating Expenses 110 559,410 341,745 (6,077 ) 895,188 Operating (Loss) Income (110 ) 85,178 73,607 — 158,675 Interest Expense (Income), Net(1) 49,625 4,057 48,754 — 102,436 Other Expense (Income), Net 182 527 14,501 — 15,210 (Loss) Income from Continuing Operations Before Provision (Benefit) for Income Taxes (49,917 ) 80,594 10,352 — 41,029 Provision (Benefit) for Income Taxes — 1,301 9,252 — 10,553 Equity in the (Earnings) Losses of Subsidiaries, Net of Tax (79,478 ) 4,158 — 75,320 — Income (Loss) from Continuing Operations 29,561 75,135 1,100 (75,320 ) 30,476 (Loss) Income from Discontinued Operations, Net of Tax — (24 ) — — (24 ) Net Income (Loss) 29,561 75,111 1,100 (75,320 ) 30,452 Less: Net Income (Loss) Attributable to Noncontrolling Interests — — 891 — 891 Net Income (Loss) Attributable to Iron Mountain Incorporated $ 29,561 $ 75,111 $ 209 $ (75,320 ) $ 29,561 Net Income (Loss) $ 29,561 $ 75,111 $ 1,100 $ (75,320 ) $ 30,452 Other Comprehensive Income (Loss): Foreign Currency Translation Adjustments 6,141 — 12,050 — 18,191 Change in fair value of interest rate swap agreements (2,674 ) — — — (2,674 ) Equity in Other Comprehensive (Loss) Income of Subsidiaries 11,237 7,156 — (18,393 ) — Total Other Comprehensive Income (Loss) 14,704 7,156 12,050 (18,393 ) 15,517 Comprehensive Income (Loss) 44,265 82,267 13,150 (93,713 ) 45,969 Comprehensive (Loss) Income Attributable to Noncontrolling Interests — — 1,704 — 1,704 Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated $ 44,265 $ 82,267 $ 11,446 $ (93,713 ) $ 44,265 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements. 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 Intercompany cost of sales — 4,491 1,205 (5,696 ) — Selling, general and administrative 43 185,348 84,339 — 269,730 Depreciation and amortization 33 102,446 58,099 — 160,578 (Gain) Loss on disposal/write-down of property, plant and equipment, net — (356 ) (774 ) — (1,130 ) Total Operating Expenses 76 538,092 345,427 (5,696 ) 877,899 Operating (Loss) Income (76 ) 89,819 74,816 — 164,559 Interest Expense (Income), Net(1) 49,941 (1,508 ) 49,193 — 97,626 Other (Income) Expense, 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 (Benefit) Provision 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 — (422 ) (40 ) — (462 ) Net Income (Loss) 44,684 93,192 (2,045 ) (90,679 ) 45,152 Less: Net Income (Loss) 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 Income (Loss) 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 _____________________________________________________________ (1) Included within Interest Expense (Income), Net are intercompany management fees and royalty fees, which are eliminated in our consolidated financial statements.
Schedule of selected consolidated cash flow statements of Parent, Guarantors, Canada Company and Non-Guarantors	CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS Three Months Ended March 31, 2019 Parent Guarantors Non- Eliminations Consolidated Cash Flows from Operating Activities: Cash Flows from Operating Activities—Continuing Operations $ (68,310 ) $ 116,235 $ 69,142 $ — $ 117,067 Cash Flows from Operating Activities—Discontinued Operations — — — — — Cash Flows from Operating Activities (68,310 ) 116,235 $ 69,142 $ — $ 117,067 Cash Flows from Investing Activities: Capital expenditures — (84,766 ) (99,999 ) — (184,765 ) Cash paid for acquisitions, net of cash acquired — (9,508 ) (29,915 ) — (39,423 ) Intercompany loans to subsidiaries 252,175 22,859 — (275,034 ) — Acquisitions of customer relationships, customer inducements and data center lease-based intangibles — (49,301 ) (18,611 ) — (67,912 ) Investments in joint ventures (see Note 9) — (19,222 ) — — (19,222 ) Proceeds from sales of property and equipment and other, net — 36 69 — 105 Cash Flows from Investing Activities—Continuing Operations 252,175 (139,902 ) (148,456 ) (275,034 ) (311,217 ) Cash Flows from Investing Activities—Discontinued Operations — — — — — Cash Flows from Investing Activities 252,175 (139,902 ) (148,456 ) (275,034 ) (311,217 ) Cash Flows from Financing Activities: Repayment of revolving credit facility, term loan facilities and other debt — (410,563 ) (940,679 ) — (1,351,242 ) Proceeds from revolving credit facility, term loan facilities and other debt — 734,243 989,219 — 1,723,462 Debit (payments) balances under cash pools — (10,612 ) 15,638 (5,026 ) — Debt (repayment to) financing from and equity (distribution to) contribution from noncontrolling interests, net — — (498 ) — (498 ) Intercompany loans from parent — (228,937 ) (46,097 ) 275,034 — Parent cash dividends (178,023 ) — — — (178,023 ) Net (payments) proceeds associated with employee stock-based awards (5,963 ) — — — (5,963 ) Cash Flows from Financing Activities—Continuing Operations (183,986 ) 84,131 17,583 270,008 187,736 Cash Flows from Financing Activities—Discontinued Operations — — — — — Cash Flows from Financing Activities (183,986 ) 84,131 17,583 270,008 187,736 Effect of exchange rates on cash and cash equivalents — — 2,404 — 2,404 (Decrease) Increase in cash and cash equivalents (121 ) 60,464 (59,327 ) (5,026 ) (4,010 ) Cash and cash equivalents, including Restricted Cash, beginning of period 132 61,650 169,318 (65,615 ) 165,485 Cash and cash equivalents, including Restricted Cash, $ 11 $ 122,114 $ 109,991 $ (70,641 ) $ 161,475 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 ) — 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 — (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 facility, term loan facilities and other debt — (2,308,119 ) (2,102,537 ) — (4,410,656 ) Proceeds from revolving credit facility, 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 (repayment to) financing from and equity (distribution to) contribution from 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, including Restricted Cash, beginning of period 2,433 634,317 383,675 (94,726 ) 925,699 Cash and cash equivalents, including Restricted Cash, end of period $ 3,194 $ 75,061 $ 395,283 $ (31,047 ) $ 442,491

Segment Information (Tables)

Segment Information (Tables)	3 Months Ended
	Mar. 31, 2019
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, 2019 Total Revenues $ 527,380 $ 96,747 $ 128,753 $ 200,956 $ 61,536 $ 38,491 $ 1,053,863 Storage Rental 306,986 66,572 80,695 129,473 59,718 19,530 662,974 Service 220,394 30,175 48,058 71,483 1,818 18,961 390,889 Depreciation and Amortization 60,002 10,202 15,257 30,599 31,632 14,791 162,483 Depreciation 45,752 8,013 10,947 18,218 19,013 12,668 114,611 Amortization 14,250 2,189 4,310 12,381 12,619 2,123 47,872 Adjusted EBITDA 223,683 50,552 39,209 58,124 26,011 (73,073 ) 324,506 Total Assets(1) 5,823,817 902,514 1,414,878 2,686,938 2,310,001 551,215 13,689,363 Expenditures for Segment Assets 56,265 5,632 30,101 31,254 153,705 15,143 292,100 Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations) 28,688 5,632 2,116 15,149 121,557 11,623 184,765 Cash Paid (Received) for Acquisitions, Net of Cash Acquired 9,876 — 11,484 14,543 — 3,520 39,423 Acquisitions of Customer Relationships, Customer Inducements and Contract Fulfillment Costs and third-party commissions. 17,701 — 16,501 1,562 32,148 — 67,912 As of and for the Three Months Ended March 31, 2018 Total Revenues $ 526,843 $ 99,964 $ 134,075 $ 210,767 $ 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 50,123 79,020 1,108 8,316 391,309 Depreciation and Amortization 62,752 10,104 17,556 31,873 22,268 16,025 160,578 Depreciation 49,138 8,023 12,758 19,064 11,380 13,069 113,432 Amortization 13,614 2,081 4,798 12,809 10,888 2,956 47,146 Adjusted EBITDA 225,738 53,852 43,966 60,747 20,790 (62,078 ) 343,015 Total Assets(1) 5,030,238 833,690 917,155 2,441,685 1,875,766 899,615 11,998,149 Expenditures for Segment Assets 43,181 6,853 7,480 32,160 1,438,012 14,939 1,542,625 Capital Expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations) 29,870 6,853 6,047 25,142 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. Total assets as of March 31, 2019 reflects the adoption of ASU 2016-02.
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 2019 2018 Adjusted EBITDA $ 324,506 $ 343,015 (Add)/Deduct: Provision (Benefit) for Income Taxes 10,553 1,168 Other Expense (Income), Net 15,210 20,151 Interest Expense, Net 102,436 97,626 Loss (gain) on disposal/write-down of property, plant and equipment, net 602 (1,130 ) Depreciation and Amortization 162,483 160,578 Significant Acquisition Costs(1) 2,746 19,008 Income (Loss) from Continuing Operations $ 30,476 $ 45,614 _______________________________________________________________________________ (1) As defined in Note 9 to Notes to Consolidated Financial Statements included in our Annual Report.
Revenue from External Customers by Products and Services [Table Text Block]	Information as to our revenues by product and service lines by segment 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 Total Consolidated For the Three Months Ended March 31, 2019 Records Management(1) $ 427,367 $ — $ 108,707 $ 172,977 $ — $ 24,345 $ 733,396 Data Management(1) — 93,989 19,886 19,227 — 14,146 147,248 Information Destruction(1)(2) 100,013 2,758 160 8,752 — — 111,683 Data Center — — — — 61,536 — 61,536 Total Revenues $ 527,380 $ 96,747 $ 128,753 $ 200,956 $ 61,536 $ 38,491 $ 1,053,863 For the Three Months Ended March 31, 2018 Records Management(1) $ 435,002 $ — $ 113,759 $ 181,330 $ — $ 10,404 $ 740,495 Data Management(1) — 97,594 20,219 20,478 — 13,802 152,093 Information Destruction(1)(2) 91,841 2,370 97 8,959 — — 103,267 Data Center — — — — 46,603 — 46,603 Total Revenues $ 526,843 $ 99,964 $ 134,075 $ 210,767 $ 46,603 $ 24,206 $ 1,042,458 _______________________________________________________________________________ (1) Each of the offerings within our product and service lines has a component of revenue that is storage rental related and a component that is service revenues, except for information destruction, which does not have a storage rental component. (2) Includes secure shredding services.

Stockholders' Equity Matters (T

Stockholders' Equity Matters (Tables)	3 Months Ended
	Mar. 31, 2019
Equity [Abstract]
Schedule of dividend declared and payments	In fiscal year 2018 and the first three months of 2019, our board of directors declared the following dividends: Declaration Date Dividend Record Date Total Payment Date February 14, 2018 $ 0.5875 March 15, 2018 $ 167,969 April 2, 2018 May 24, 2018 0.5875 June 15, 2018 168,078 July 2, 2018 July 24, 2018 0.5875 September 17, 2018 168,148 October 2, 2018 October 25, 2018 0.6110 December 17, 2018 174,935 January 3, 2019 February 7, 2019 0.6110 March 15, 2019 175,242 April 2, 2019

Significant Acquisition Costs (

Significant Acquisition Costs (Tables)	3 Months Ended
	Mar. 31, 2019
Business Combinations [Abstract]
Acquisition costs Included in Statement of Operations	Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations by segment are as follows: Three Months Ended 2019 2018 North American Records and Information Management Business $ 378 $ 584 North American Data Management Business — — Western European Business — 2,152 Other International Business 502 537 Global Data Center Business 143 10,181 Corporate and Other Business 1,723 5,554 Total Significant Acquisition Costs $ 2,746 $ 19,008 Significant Acquisition Costs included in the accompanying Condensed Consolidated Statements of Operations are as follows: Three Months Ended 2019 2018 Cost of sales (excluding depreciation and amortization) $ 898 $ 296 Selling, general and administrative expenses 1,848 18,712 Total Significant Acquisition Costs $ 2,746 $ 19,008
Restructuring and Related Costs [Table Text Block]	Three Months Ended 2019 2018 North American Records and Information Management Business $ 378 $ 584 North American Data Management Business — — Western European Business — 2,152 Other International Business 502 537 Global Data Center Business 143 10,181 Corporate and Other Business 1,723 5,554 Total Significant Acquisition Costs $ 2,746 $ 19,008

Summary of Significant Accoun_4

Summary of Significant Accounting Policies - Cash and Cash Equivalents and Foreign Currency (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Cash and Cash Equivalents and Restricted Cash [Abstract]
Restricted cash	$ 15,250	$ 15,141

Summary of Significant Accoun_5

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, 2019	Dec. 31, 2018
Assets:
Finite-Lived Intangible Assets, Net Carrying Amount	$ 1,495,338	$ 1,506,522
Customer relationship intangible assets
Assets:
Finite-Lived Intangible Assets, Gross	1,754,794	1,718,919
Finite-Lived Intangible Assets, Accumulated Amortization	(482,971)	(455,705)
Finite-Lived Intangible Assets, Net Carrying Amount	1,271,823	1,263,214
Customer inducements
Assets:
Finite-Lived Intangible Assets, Gross	51,405	56,478
Finite-Lived Intangible Assets, Accumulated Amortization	(28,711)	(34,181)
Finite-Lived Intangible Assets, Net Carrying Amount	22,694	22,297
Data center lease-based intangible assets
Assets:
Finite-Lived Intangible Assets, Gross	265,834	271,818
Finite-Lived Intangible Assets, Accumulated Amortization	(65,013)	(50,807)
Finite-Lived Intangible Assets, Net Carrying Amount	200,821	221,011
Liabilities:
Data center Below Market Lease, Gross Carrying Amount	12,715	12,318
Below Market Lease, Accumulated Amortization	(2,451)	(1,642)
Below Market Lease, Net Carrying Amount	10,264	10,676
Capitalized commissions asset
Assets:
Finite-Lived Intangible Assets, Gross	30,861	30,071
Finite-Lived Intangible Assets, Accumulated Amortization	(737)	(1,089)
Finite-Lived Intangible Assets, Net Carrying Amount	30,124	28,982
Customer relationships, customer inducements and data center
Assets:
Finite-Lived Intangible Assets, Gross	2,102,894	2,077,286
Finite-Lived Intangible Assets, Accumulated Amortization	(577,432)	(541,782)
Finite-Lived Intangible Assets, Net Carrying Amount	$ 1,525,462	$ 1,535,504

Summary of Significant Accoun_6

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets and Liabilities - Schedule Of Other Finite-Lived Intangile Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Finite-Lived Intangible Assets
Customer relationships, customer inducements and data center lease-based intangibles	$ 1,495,338	$ 1,506,522
Third-party commissions asset and other finite-lived intangible assets
Finite-Lived Intangible Assets
Finite-Lived Intangible Assets, Gross	20,290	20,310
Finite-Lived Intangible Assets, Accumulated Amortization	(15,794)	(14,798)
Customer relationships, customer inducements and data center lease-based intangibles	$ 4,496	$ 5,512

Summary of Significant Accoun_7

Summary of Significant Accounting Policies - Goodwill and Other Intangible Assets - Amortization Expense (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 47,872	$ 47,146
Customer relationship and customer inducement intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	27,881	28,806
Leases Acquired In Place and Tenant Relationships [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	12,609	10,838
Third-party commissions asset and other finite-lived intangible assets
Finite-Lived Intangible Assets
Amortization of Intangible Assets	757	1,185
Customer inducements
Finite-Lived Intangible Assets
Amortization of Intangible Assets	2,740	2,585
Data Center Above and Below Market Leases [Member]
Finite-Lived Intangible Assets
Amortization of Intangible Assets	$ 905	$ 1,079

Summary of Significant Accoun_8

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, 2019	Dec. 31, 2018
Gross amount of goodwill [Roll Forward]
Goodwill	$ 4,465,378	$ 4,441,030
Non-deductible goodwill acquired during the year	10,632
Goodwill, Deductible, Acquired During Period	5,501
Goodwill, Purchase Accounting Adjustments	2,134
Fair value and other adjustments	2,565
Currency effects	6,081
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	135,420
Accumulated goodwill impairment, ending balance	135,420
Goodwill, Purchase Accounting Adjustments, Offset	431
North American Records and Information Management Business
Gross amount of goodwill [Roll Forward]
Goodwill	2,261,248	2,251,795
Non-deductible goodwill acquired during the year	0
Goodwill, Deductible, Acquired During Period	5,501
Goodwill, Purchase Accounting Adjustments	31
Currency effects	3,921
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	85,909
Accumulated goodwill impairment, ending balance	85,909
North American Data Management Business
Gross amount of goodwill [Roll Forward]
Goodwill	494,558	493,491
Non-deductible goodwill acquired during the year	0
Goodwill, Deductible, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	0
Currency effects	1,067
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Western European Business
Gross amount of goodwill [Roll Forward]
Goodwill	388,282	381,806
Non-deductible goodwill acquired during the year	4,991
Goodwill, Deductible, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	92
Currency effects	1,393
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	46,500
Accumulated goodwill impairment, ending balance	46,500
Other International Business
Gross amount of goodwill [Roll Forward]
Goodwill	826,466	818,223
Non-deductible goodwill acquired during the year	3,767
Goodwill, Deductible, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	3,350
Currency effects	1,126
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Global Data Center Business
Gross amount of goodwill [Roll Forward]
Goodwill	423,519	425,956
Non-deductible goodwill acquired during the year	0
Goodwill, Deductible, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	(871)
Currency effects	(1,566)
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	0
Accumulated goodwill impairment, ending balance	0
Corporate and Other
Gross amount of goodwill [Roll Forward]
Goodwill	71,305	$ 69,759
Non-deductible goodwill acquired during the year	1,874
Goodwill, Deductible, Acquired During Period	0
Goodwill, Purchase Accounting Adjustments	(468)
Currency effects	140
Goodwill accumulated amortization [Roll Forward]
Accumulated goodwill impairment, beginning balance	3,011
Accumulated goodwill impairment, ending balance	$ 3,011

Summary of Significant Accoun_9

Summary of Significant Accounting Policies Summary of Significant Accounting Policies - Revenue - Narrative (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 1,053,863	$ 1,042,458
Storage rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	662,974	651,149
Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	61,536	46,603
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
Global Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	61,536	46,603
Global Data Center Business | Storage rental
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	59,718	45,495
Global Data Center Business | Data Center Business
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	61,536	$ 46,603
Operating Segments [Member] | Global Data Center Business | Storage Rental, Power And Connectivity [Member]
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenue from Contract with Customer, Excluding Assessed Tax	$ 9,100

Summary of Significant Accou_10

Summary of Significant Accounting Policies - Revenue - Contract Fulfillment Assets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Capitalized commissions asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount	$ 27,562	$ 23,787
Accumulated Amortization	(24,923)	(34,637)
Gross Carrying Amount	52,485	58,424
Intake Costs asset
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Net Carrying Amount	15,114	15,244
Accumulated Amortization	(21,041)	(24,504)
Gross Carrying Amount	$ 36,155	$ 39,748

Summary of Significant Accou_11

Summary of Significant Accounting Policies - Revenue - Amortization Expense Associated with Commissions Asset and Intake Costs (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Capitalized commissions asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 3,946	$ 3,587
Intake Costs asset
Capitalized Contract Cost [Line Items]
Amortization expense	$ 2,679	$ 2,730

Summary of Significant Accou_12

Summary of Significant Accounting Policies - Revenue - Summary of Deferred Revenue Liabilities (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Deferred revenue	$ 266,314	$ 264,823
Other Long-term Liabilities	127,127	111,331
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	266,314	264,823
Other Long-term Liabilities	$ 25,625	$ 26,401

Summary of Significant Accou_13

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, 2019	Mar. 31, 2018
Revenue, Initial Application Period Cumulative Effect Transition [Line Items]
Revenues	$ 1,053,863	$ 1,042,458
Operating Income	158,675	164,559
Income (Loss) from Continuing Operations, Net of Tax, Including Portion Attributable to Noncontrolling Interest	30,476	45,614
Income from Continuing Operations	$ 41,029	$ 46,782
Income (Loss) from continuing operations (in dollars per share)	$ 0.10	$ 0.16
Income (Loss) from continuing operations (in dollars per share)	$ 0.10	$ 0.16

Summary of Significant Accou_14

Summary of Significant Accounting Policies - Leases (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Jan. 01, 2019
Lessee, Lease, Description [Line Items]
Finance Lease, Right-Of-Use Asset, Real Estate Assets, Percent	66.00%
Operating Lease, Right-Of-Use Asset, Real Estate Assets, Percent	98.00%
Sublease income	$ 3,047
Finance Lease, Right-Of-Use Asset, Non-Real Estate Assets, Percent	34.00%
Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term	5 years
Lessee, operating lease, renewal term	1 year
Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term	10 years
Lessee, operating lease, renewal term	5 years
Vehicle And Equipment | Minimum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term	1 year
Vehicle And Equipment | Maximum
Lessee, Lease, Description [Line Items]
Lessee, operating lease, term	7 years
Accounting Standards Update 2016-02 [Member]
Lessee, Lease, Description [Line Items]
Cumulative Effect of New Accounting Principle in Period of Adoption	$ 5,781	$ 5,800

Summary of Significant Accou_15

Summary of Significant Accounting Policies - Leases - Supplemental Balance Sheet (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019
Accounting Policies [Abstract]
Operating Lease, Right-Of-Use Asset, Non-Real Estate Assets, Percent	2.00%
Operating lease right-of use assets	$ 1,791,536	$ 1,825,721
Financing lease right-of-use assets, net of accumulated depreciation	351,750	361,078
Total	2,143,286	2,186,799
Operating lease liabilities	206,286	209,911
Financing lease liabilities	51,222	50,437
Total current lease liabilities	257,508	260,348
Operating lease liabilities	1,656,659	1,685,771
Financing lease liabilities	338,728	350,263
Total long-term lease liabilities	1,995,387	2,036,034
Total	$ 2,252,895	$ 2,296,382

Summary of Significant Accou_16

Summary of Significant Accounting Policies - Leases - Costs (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 111,906
Depreciation of financing lease right-of-use assets	16,329
Interest expense for financing lease liabilities	6,142
Total financing lease cost	22,471
Variable lease costs	$ 25,489
Operating leases, remaining lease term	11 years 1 month 6 days
Finance leases, remaining lease term	11 years
Operating leases, discount rate	7.10%
Financing leases, discount rate	5.70%
Cost of Sales
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 108,601
Selling, General and Administrative Expenses
Lessee, Lease, Description [Line Items]
Operating lease cost	$ 3,305

Summary of Significant Accou_17

Summary of Significant Accounting Policies - Leases - Estimated Future Lease Payments (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
Accounting Policies [Abstract]
2019 (excluding the three months ended March 31, 2019)	$ 251,699
2020	308,267
2021	280,931
2022	257,598
2023	234,035
Thereafter	1,409,241
Total minimum lease payments	2,741,771
Less amounts representing interest or imputed interest	(878,826)
Present value of lease obligations	1,862,945
2019 (excluding the three months ended March 31, 2019)	(6,039)
2020	(7,337)
2021	(7,228)
2022	(6,851)
2023	(6,548)
Thereafter	(6,922)
Total minimum lease payments	(40,925)
2019 (excluding the three months ended March 31, 2019)	59,411
2020	68,333
2021	59,710
2022	49,997
2023	39,643
Thereafter	287,609
Total minimum lease payments	564,703
Present value of lease obligations	(174,753)
Present value of lease obligations	$ 389,950
2019		$ 323,454
2020		293,276
2021		267,379
2022		246,128
2023		221,808
Thereafter		1,287,807
Total minimum lease payments		2,639,852
2019		(7,525)
2020		(7,200)
2021		(7,063)
2022		(6,694)
2023		(6,409)
Thereafter		(6,279)
Total minimum lease payments		(41,170)
2019		80,513
2020		71,335
2021		61,269
2022		52,832
2023		44,722
Thereafter		377,750
Total minimum lease payments		688,421
Less amounts representing interest		(241,248)
Present value of finance lease obligations		$ 447,173

Summary of Significant Accou_18

Summary of Significant Accounting Policies - Leases - Supplemental Cash Flows (Details) $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)
Accounting Policies [Abstract]
Operating cash flows used in operating leases	$ 83,676
Financing cash flows used in financing leases	16,675
Operating lease modifications and reassessments	1,842
New operating leases (including acquisitions)	21,535
Financing lease modifications and reassessments	0
New financing leases	$ 7,523

Summary of Significant Accou_19

Summary of Significant Accounting Policies - Stock-Based Compensation (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Employee stock-based awards
Weighted Average Common Shares Outstanding-Basic (in shares)	286,528,000	285,259,000
Stock-based compensation	$ 8,519	$ 7,384
Stock-based compensation expense (income), net of tax	$ 7,935	$ 6,833
Stock-based compensation expense per basic and diluted share (in dollars per share)	$ 0.03	$ 0.02
Share-Based Compensation, aggregate disclosures
Employee stock-based awards, unrecognized compensation costs on nonvested awards	$ 72,353
Employee stock-based awards, unrecognized compensation costs on nonvested awards, weighted average period of recognition	2 years 2 months 1 day
Stock Options
Summary of option activity
Options outstanding balance, beginning of period (in shares)	4,271,834
Options granted (in shares)	920,706
Options exercised (in shares)	(99,334)
Options forfeited (in shares)	(6,007)
Options expired (in shares)	(9,629)
Options outstanding balance, end of period (in shares)	5,077,570
Options exercisable balance (in shares)	3,258,982
Options expected to vest (in shares)	1,691,146
Performance units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	667,101
Granted (in shares)	380,856
Vested (in shares)	(169,523)
Forfeited (in shares)	(19,666)
Non-vested at the end of the period (in shares)	858,768
Total fair value of shares or units vested	$ 6,503	$ 3,033
Performance units | Two Thousand Seventeen [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units | Two Thousand Eighteen [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
Performance units | Two Thousand Nineteen [Member]
Performance units disclosure
Percentage of achievement of the predefined revenue and ROIC targets	100.00%
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)	967,049
Granted (in shares)	380,856
Vested (in shares)	(169,523)
Forfeited (in shares)	(4,816)
Non-vested at the end of the period (in shares)	1,173,566
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)	(299,948)
Granted (in shares)	0
Vested (in shares)	0
Forfeited (in shares)	(14,850)
Non-vested at the end of the period (in shares)	(314,798)
Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options
Non-vested at the beginning of the period (in shares)	1,196,566
Granted (in shares)	621,281
Vested (in shares)	(453,167)
Forfeited (in shares)	(18,075)
Non-vested at the end of the period (in shares)	1,346,605
Total fair value of shares or units vested	$ 15,333	$ 15,330

Summary of Significant Accou_20

Summary of Significant Accounting Policies - Income Per Share, Allowance for Doubful Accounts, Income Taxes, and Concentration of Credit Risk (Details) - USD ($) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Income (Loss) Per Share-Basic and Diluted
Income (loss) from continuing operations	$ 30,476	$ 45,614
Less: Net Income (Loss) Attributable to Noncontrolling Interests	891	468
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation)	29,585	45,146
Income (loss) from discontinued operations, net of tax	(24)	(462)
Net income (loss) attributable to Iron Mountain Incorporated	$ 29,561	$ 44,684
Weighted-average shares—basic	286,528,000	285,259,000
Effect of dilutive potential stock options (in shares)	231,402	249,564
Effect of dilutive potential restricted stock, RSUs and PUs (in shares)	732,421	484,314
Weighted-average shares—diluted	287,491,823	285,992,878
Earnings (Losses) per share-basic:
Income (Loss) from continuing operations (in dollars per share)	$ 0.10	$ 0.16
Total (loss) income discontinued operations (in dollars per share)	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)	0.10	0.16
Earnings (Losses) per share-diluted:
Income (Loss) from continuing operations (in dollars per share)	0.10	0.16
Total (loss) income from discontinued operations (in dollars per share)	0	0
Net Income (Loss) Attributable to Iron Mountain Incorporated (in dollars per share)	$ 0.10	$ 0.16
Antidilutive stock options, RSUs and PUs, excluded from the calculation (in shares)	3,985,161	3,242,141
Income Taxes:
Effective tax rates (as a percent)	25.70%	2.50%
Income (Loss) From Continuing Operations Before Income Taxes, Minority Interest, and (Gain) Loss on Disposition of Real Estate	$ 41,029	$ 46,782
Federal statutory tax rate (as a percent)	21.00%	21.00%
Concentrations of Credit Risk
Effective Income Tax Rate Reconciliation, Tax Settlement, Amount		$ 14,000

Summary of Significant Accou_21

Summary of Significant Accounting Policies - Fair Value Measurements (Details) € in Thousands, $ in Thousands	Mar. 31, 2019USD ($)	Mar. 31, 2019EUR (€)	Dec. 31, 2018USD ($)	Dec. 31, 2018EUR (€)	Mar. 31, 2018EUR (€)
Assets and liabilities carried at fair value measured on a recurring basis
Derivative, amount of hedged item | €		€ 271,146			€ 164,244
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
Trading securities	9,490		10,248
Foreign Currency Contract, Asset, Fair Value Disclosure	0		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	1,739
Time Deposits, at Carrying Value			956
Trading securities	670		505
Foreign Currency Contract, Asset, Fair Value Disclosure	23		93
Foreign Currency Contracts, Liability, Fair Value Disclosure	109		973
Interest Rate Swap	3,647
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
Trading securities	0		0
Foreign Currency Contract, Asset, Fair Value Disclosure	0		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	1,739
Time Deposits, at Carrying Value			956
Trading securities	10,160		10,753
Foreign Currency Contract, Asset, Fair Value Disclosure	23		93
Foreign Currency Contracts, Liability, Fair Value Disclosure	109		973
Interest Rate Swap	3,647
Long | Foreign exchange contracts
Assets and liabilities carried at fair value measured on a recurring basis
Notional amount of derivatives | €		4,000		€ 29,000
Long | Foreign Exchange Forward - Option Two [Member]
Assets and liabilities carried at fair value measured on a recurring basis
Notional amount of derivatives	4,515
Short | Foreign exchange contracts
Assets and liabilities carried at fair value measured on a recurring basis
Derivative, amount of hedged item	4,610		33,374
Short | Foreign Exchange Forward - Option Two [Member]
Assets and liabilities carried at fair value measured on a recurring basis
Derivative, amount of hedged item | €		€ 4,000
Designated as Hedging Instrument | Interest Rate Swap
Assets and liabilities carried at fair value measured on a recurring basis
Notional amount of derivatives	$ 350,000		$ 350,000

Summary of Significant Accou_22

Summary of Significant Accounting Policies - Accumulated Other Comprehensive Income and Other Expenses (Details) € in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2019USD ($)	Mar. 31, 2018USD ($)	Mar. 31, 2019EUR (€)	Mar. 31, 2018EUR (€)
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	$ (265,664)	$ (103,989)
Other comprehensive loss:
Foreign currency translation adjustments	17,378	30,092
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(2,674)	(185)
Total Other comprehensive (loss) income	14,704	29,907
Derivative, amount of hedged item | €			€ 271,146	€ 164,244
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(250,960)	(74,082)
Total loss on foreign currency transactions	17,697	21,785
Other, net	(2,487)	(1,634)
Other (Income) Expense, Net	15,210	20,151
Derivatives used in Net Investment Hedge, Net of Tax | €			€ 20,399
Consumer Storage | Disposal Group, Not Discontinued Operations
Accumulated other comprehensive items, net
Disposal Group, Not Discontinued Operation, Gain (Loss) on Disposal	4,200
Foreign currency translation adjustments
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(264,691)	(103,989)
Other comprehensive loss:
Foreign currency translation adjustments	17,378	30,092
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	0	0
Total Other comprehensive (loss) income	17,378	30,092
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(247,313)	(73,897)
Market value adjustments for securities
Accumulated other comprehensive items, net
Accumulated Other Comprehensive Income (Loss), Net of Tax, Beginning Balance	(973)	0
Other comprehensive loss:
Foreign currency translation adjustments	0	0
Other Comprehensive Income (Loss), Derivatives Qualifying as Hedges, Net of Tax	(2,674)	(185)
Total Other comprehensive (loss) income	(2,674)	(185)
Accumulated Other Comprehensive Income (Loss), Net of Tax, Ending Balance	(3,647)	(185)
Senior Notes [Member]
Other comprehensive loss:
Foreign currency translation adjustments	$ 6,141	$ (5,635)

Acquisitions - Narrative (Detai

Acquisitions - Narrative (Details) $ in Thousands	Jan. 10, 2018USD ($)	Feb. 28, 2019USD ($)	Mar. 31, 2019USD ($)company
Storage and Data Management Company [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired | company			4
Art Storage Company [Member]
Business Acquisition [Line Items]
Number of Businesses Acquired | company			1
2019 Acquisitions
Business Acquisition [Line Items]
Cash consideration			$ 31,900
Consideration transferred			35,240
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Consideration transferred	$ 1,347,000	$ 31,000
Business combination separately recognized transactions expenses and losses recognized, acquisition costs incurred to date			$ 28,064

Acquisitions - Pro Forma Financ

Acquisitions - Pro Forma Financial Information (Details) $ / shares in Units, $ in Thousands	3 Months Ended
	Mar. 31, 2018USD ($)$ / shares
Business Combinations [Abstract]
Total Revenues | $	$ 1,045,948
Income from Continuing Operations | $	$ 55,566
Per Share Income from Continuing Operations - Basic | $ / shares	$ 0.20
Per Share Income from Continuing Operations - Diluted | $ / shares	$ 0.19

Acquisitions - Schedule of Purc

Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Thousands	Jan. 10, 2018	Feb. 28, 2019	Mar. 31, 2019	Mar. 31, 2018	Jan. 01, 2019	Dec. 31, 2018
Business Acquisition [Line Items]
Cash Paid for Acquisitions, Net of Cash Acquired			$ 39,423	$ 1,428,974
Accrued Purchase Price and Other Holdbacks			1,042	$ 149
Fair Value of Identifiable Assets Acquired:
Operating lease right-of-use assets (see Note 2.d.)			1,791,536		$ 1,825,721
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)			1,656,659		$ 1,685,771
Goodwill			4,465,378			$ 4,441,030
2019 Acquisitions
Business Acquisition [Line Items]
Cash Paid (gross of cash acquired)			31,900
Cash Paid for Acquisitions, Net of Cash Acquired			34,198
Accrued Purchase Price and Other Holdbacks			1,042
Total Consideration			35,240
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents			2,273
Fair Value of Identifiable Assets Acquired:
Cash			2,273
Accounts Receivable and Prepaid Expenses			2,845
Property, Plant and Equipment			4,039
Customer Relationship Intangible Assets			13,589
Operating lease right-of-use assets (see Note 2.d.)			10,541
Accounts Payable, Accrued Expenses and Other Liabilities			(2,065)
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)			(10,541)
Deferred Income Taxes			1,574
Total Fair Value of Identifiable Net Assets Acquired			19,107
Goodwill			16,133
Payments for (Proceeds from) Previous Acquisition			$ 7,498
IO Data Center LLC [Member]
Business Acquisition [Line Items]
Total Consideration	$ 1,347,000	$ 31,000

Debt Schedule of Long Term Debt

Debt Schedule of Long Term Debt (Details) $ in Thousands, $ in Thousands	Mar. 31, 2019USD ($)	Mar. 31, 2019AUD ($)	Dec. 31, 2018USD ($)	Mar. 22, 2018USD ($)
Debt Instrument [Line Items]
Long-term Debt, Gross	$ 8,574,147		$ 8,229,430
Unamortized Debt Issuance Expense	(83,268)		(86,607)
Long-term Debt	8,490,879		8,142,823
Long-term Debt, Gross, Current Maturities	(125,142)		(126,406)
Unamortized Debt Issuance Expense, Current	0		0
Long-term Debt, Current Maturities	(125,142)		(126,406)
Long Term Debt, Gross, Net of Current Portion	8,449,005		8,103,024
Unamortized Debt Issuance Expense, Net	(83,268)		(86,607)
Long-term Debt, Excluding Current Maturities	8,365,737		8,016,417
Senior Notes 4.375 Percent due 2021 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	500,000		500,000
Fair Value	$ 502,500		$ 488,750
Stated interest rate (as a percent)	4.375%	4.375%	4.375%
Unamortized Debt Issuance Expense	$ (3,725)		$ (4,155)
Long-term Debt	$ 496,275		495,845
Australian Dollar Term Loan [Member]
Debt Instrument [Line Items]
Average interest rate (as a percent)	5.70%	5.70%
Debt Instrument, Unamortized Discount	$ 1,587		1,690
Long-term Debt, Gross	234,000		233,955
Fair Value	235,587		235,645
Unamortized Debt Issuance Expense	(2,893)		(3,084)
Long-term Debt	231,107	$ 331,875	230,871
6% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	600,000		600,000
Fair Value	$ 615,000		$ 606,000
Stated interest rate (as a percent)	6.00%	6.00%	6.00%
Unamortized Debt Issuance Expense	$ (4,851)		$ (5,126)
Long-term Debt	595,149		594,874
CAD 5.375 Percent Senior Notes due 2023 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	187,262		183,403
Fair Value	$ 189,444		$ 186,154
Stated interest rate (as a percent)	5.375%	5.375%	5.375%
Unamortized Debt Issuance Expense	$ (2,424)		$ (2,506)
Long-term Debt	184,838		180,897
The 5 3/4% Notes
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000		1,000,000
Fair Value	$ 1,010,000		$ 940,000
Stated interest rate (as a percent)	5.75%	5.75%	5.75%
Unamortized Debt Issuance Expense	$ (7,439)		$ (7,782)
Long-term Debt	992,561		992,218
Euro Notes 3 Percent due 2025 [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	336,557		343,347
Fair Value	$ 337,684		$ 321,029
Stated interest rate (as a percent)	3.00%	3.00%	3.00%
Unamortized Debt Issuance Expense	$ (3,941)		$ (4,098)
Long-term Debt	332,616		339,249
GBP Notes due 2025 3.875 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	521,286		509,425
Fair Value	$ 495,852		$ 453,811
Stated interest rate (as a percent)	3.875%	3.875%	3.875%
Unamortized Debt Issuance Expense	$ (6,480)		$ (6,573)
Long-term Debt	514,806		502,852
Senior Notes 5.375 Percent due 2026
Debt Instrument [Line Items]
Long-term Debt, Gross	250,000		250,000
Fair Value	$ 246,875		$ 224,375
Stated interest rate (as a percent)	5.375%	5.375%	5.375%
Unamortized Debt Issuance Expense	$ (3,078)		$ (3,185)
Long-term Debt	246,922		246,815
Senior Notes 4.875 Percent due 2027
Debt Instrument [Line Items]
Long-term Debt, Gross	1,000,000		1,000,000
Fair Value	$ 957,500		$ 855,000
Stated interest rate (as a percent)	4.875%	4.875%	4.875%
Unamortized Debt Issuance Expense	$ (12,086)		$ (12,442)
Long-term Debt	987,914		987,558
Senior Notes due 2028 5.25 Percent [Member]
Debt Instrument [Line Items]
Long-term Debt, Gross	825,000		825,000
Fair Value	$ 798,188		$ 713,625
Stated interest rate (as a percent)	5.25%	5.25%	5.25%
Unamortized Debt Issuance Expense	$ (10,628)		$ (10,923)
Long-term Debt	$ 814,372		814,077
Accounts Receivable Securitization Program
Debt Instrument [Line Items]
Average interest rate (as a percent)	3.50%	3.50%
Long-term Debt, Gross	$ 252,373		221,673
Fair Value	252,373		221,673
Unamortized Debt Issuance Expense	(184)		(218)
Long-term Debt	252,189		221,455
Real Estate Mortgages, Capital Leases and Other
Debt Instrument [Line Items]
Long-term Debt, Gross	566,677		606,702
Fair Value	566,677		606,702
Unamortized Debt Issuance Expense	(431)		(171)
Long-term Debt	$ 566,246		606,531
Mortgage Securitization Program [Member]
Debt Instrument [Line Items]
Average interest rate (as a percent)	3.50%	3.50%
Long-term Debt, Gross	$ 50,000		50,000
Fair Value	50,000		50,000
Unamortized Debt Issuance Expense	(1,091)		(1,128)
Long-term Debt	$ 48,909		48,872
New Credit Agreement
Debt Instrument [Line Items]
Average interest rate (as a percent)	4.00%	4.00%
New Credit Agreement | Revolving Credit Facility
Debt Instrument [Line Items]
Average interest rate (as a percent)	4.00%	4.00%
Long-term Debt, Gross	$ 1,139,566		793,832
Fair Value	1,139,566		793,832
Unamortized Debt Issuance Expense	(13,332)		(14,117)
Long-term Debt	$ 1,126,234		779,715
Term Loan A [Member] | Term Loan Facility
Debt Instrument [Line Items]
Average interest rate (as a percent)	4.20%	4.20%
Long-term Debt, Gross	$ 237,500		240,625
Fair Value	237,500		240,625
Unamortized Debt Issuance Expense	0		0
Long-term Debt	$ 237,500		240,625
Term Loan B [Member] | Term Loan Facility
Debt Instrument [Line Items]
Average interest rate (as a percent)	4.30%	4.30%
Debt Instrument, Unamortized Discount	$ 1,524		1,581
Long-term Debt, Gross	691,476		693,169
Fair Value	670,478		660,013
Unamortized Debt Issuance Expense	(8,430)		(8,742)
Long-term Debt	$ 683,046		684,427
UK Bilateral Revolving Credit Facility | Revolving Credit Facility
Debt Instrument [Line Items]
Line of Credit Facility, Interest Rate at Period End	3.20%	3.20%
Long-term Debt, Gross	$ 182,450		178,299
Fair Value	182,450		178,299
Unamortized Debt Issuance Expense	(2,255)		(2,357)
Long-term Debt	$ 180,195		$ 175,942
Term Loan Facility | Term Loan B [Member] | Loans Payable [Member]
Debt Instrument [Line Items]
Maximum borrowing capacity				$ 700,000

Debt (Details)

Debt (Details) € in Thousands, $ in Thousands, $ in Thousands, $ in Thousands	Mar. 31, 2019USD ($)	Mar. 31, 2019EUR (€)	Mar. 31, 2019AUD ($)	Mar. 31, 2019CAD ($)	Dec. 31, 2018USD ($)	Mar. 22, 2018USD ($)
Debt covenants
Long-term Debt, Gross	$ 8,574,147				$ 8,229,430
Long-term Debt	$ 8,490,879				8,142,823
New Credit Agreement
Debt
Average interest rate (as a percent)	4.00%	4.00%	4.00%	4.00%
QRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position	$ 2,000				2,000
Cash pool agreement, gross cash position	271,400				300,800
Cash pool agreement, outstanding borrowings	(269,400)				(298,800)
TRS Cash Pool [Member]
Debt covenants
Cash pool agreement, net cash position	3,200				2,200
Cash pool agreement, gross cash position	281,100				281,500
Cash pool agreement, outstanding borrowings	$ (277,900)				$ (279,300)
Credit Agreement
Debt covenants
Net total lease adjusted leverage ratio	5.8	5.8	5.8	5.8	5.6
Net secured debt lease adjusted leverage ratio	2.8	2.8	2.8	2.8	2.6
Bond leverage ratio, per indentures	6.1	6.1	6.1	6.1	5.8
Fixed charge coverage ratio	2.2	2.2	2.2	2.2	2.2
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	$ 37,271
Remaining amount available for borrowing under credit facility	$ 573,163
Revolving Credit Facility | New Credit Agreement
Debt
Average interest rate (as a percent)	4.00%	4.00%	4.00%	4.00%
Fair Value	$ 1,139,566				$ 793,832
Debt covenants
Long-term Debt, Gross	1,139,566				793,832
Long-term Debt	1,126,234				779,715
Revolving Credit Facility | UK Bilateral Revolving Credit Facility
Debt
Fair Value	182,450				178,299
Debt covenants
Long-term Debt, Gross	182,450				178,299
Long-term Debt	180,195				175,942
Term Loan Facility | New Credit Agreement | USD
Debt covenants
Long-term Debt, Gross	$ 965,800
Term Loan Facility | New Credit Agreement | Canada, Dollars
Debt covenants
Long-term Debt, Gross				$ 94,200
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)	4.20%	4.20%	4.20%	4.20%
Fair Value	$ 237,500				240,625
Debt covenants
Long-term Debt, Gross	237,500				240,625
Long-term Debt	$ 237,500				240,625
Term Loan Facility | Term Loan B [Member]
Debt
Average interest rate (as a percent)	4.30%	4.30%	4.30%	4.30%
Debt Instrument, Unamortized Discount	$ 1,524				1,581
Fair Value	670,478				660,013
Debt covenants
Long-term Debt, Gross	691,476				693,169
Long-term Debt	$ 683,046				$ 684,427
Loans Payable [Member] | Term Loan B [Member] | Term Loan Facility
Debt
Maximum borrowing capacity						$ 700,000
Euro Notes 3 Percent due 2025 [Member]
Debt
Stated interest rate (as a percent)	3.00%	3.00%	3.00%	3.00%	3.00%
Fair Value	$ 337,684				$ 321,029
Debt covenants
Long-term Debt, Gross	336,557				343,347
Long-term Debt	$ 332,616				$ 339,249
Senior Notes 4.875 Percent due 2027
Debt
Stated interest rate (as a percent)	4.875%	4.875%	4.875%	4.875%	4.875%
Fair Value	$ 957,500				$ 855,000
Debt covenants
Long-term Debt, Gross	1,000,000				1,000,000
Long-term Debt	$ 987,914				$ 987,558
Senior Notes 5.375 Percent due 2026
Debt
Stated interest rate (as a percent)	5.375%	5.375%	5.375%	5.375%	5.375%
Fair Value	$ 246,875				$ 224,375
Debt covenants
Long-term Debt, Gross	250,000				250,000
Long-term Debt	$ 246,922				$ 246,815
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%
Fair Value	$ 189,444				$ 186,154
Debt covenants
Long-term Debt, Gross	187,262				183,403
Long-term Debt	$ 184,838				180,897
Australian Dollar Term Loan [Member]
Debt
Average interest rate (as a percent)	5.70%	5.70%	5.70%	5.70%
Debt Instrument, Unamortized Discount	$ 1,587				1,690
Fair Value	235,587				235,645
Debt covenants
Long-term Debt, Gross	234,000				233,955
Long-term Debt	$ 231,107		$ 331,875		$ 230,871

Debt Covenant Ratios (Details)

Debt Covenant Ratios (Details)	Mar. 31, 2019	Dec. 31, 2018
Credit Agreement
Debt Instrument [Line Items]
Net total lease adjusted leverage ratio	5.8	5.6
Net secured debt lease adjusted leverage ratio	2.8	2.6
Bond leverage ratio, per indentures	6.1	5.8
Fixed charge coverage ratio	2.2	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

Debt Cash Pool (Details)

Debt Cash Pool (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Dec. 31, 2018
QRS Cash Pool [Member]
Debt Instrument [Line Items]
Cash pool agreement, gross cash position	$ 271,400	$ 300,800
Cash pool agreement, outstanding borrowings	(269,400)	(298,800)
Cash pool agreement, net cash position	2,000	2,000
TRS Cash Pool [Member]
Debt Instrument [Line Items]
Cash pool agreement, gross cash position	281,100	281,500
Cash pool agreement, outstanding borrowings	(277,900)	(279,300)
Cash pool agreement, net cash position	$ 3,200	$ 2,200

Selected Consolidated Financi_3

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Balance Sheets (Details) - USD ($) $ in Thousands	Mar. 31, 2019	Jan. 01, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Current Assets:
Cash and Cash Equivalents	$ 161,475		$ 165,485	$ 442,491	$ 925,699
Accounts Receivable	837,521		846,889
Prepaid expenses and other	210,854		195,740
Due from Related Parties, Current	0		0
Total Current Assets	1,209,850		1,208,114
Property, Plant and Equipment, Net	4,525,583		4,489,557
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0		0
Investment in Subsidiaries	0		0
Goodwill	4,465,378		4,441,030
Operating lease right-of-use assets (see Note 2.d.)	1,791,536	$ 1,825,721
Other	1,697,016		1,713,546
Total Other Assets, Net	7,953,930		6,154,576
Total Assets	13,689,363		11,852,247	11,998,149
Liabilities and Equity
Intercompany Payable	0		0
Debit Balances Under Cash Pools	0		0
Current Portion of Long-term Debt	125,142		126,406
Total Other Current Liabilities	1,389,991		1,336,272
Long-term Debt, Net of Current Portion	8,365,737		8,016,417
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)	1,656,659	$ 1,685,771
Long-term Notes Payable to Affiliates and Intercompany Payable	0		0
Other Long-term Liabilities	317,998		417,031
Redeemable Noncontrolling Interest	73,102		70,532
Total Iron Mountain Incorporated Stockholders' Equity	1,759,401		1,884,180
Noncontrolling Interests	1,333		1,409
Total Equity	1,760,734		1,885,589	2,261,275	2,298,842
Total Liabilities and Equity	13,689,363		11,852,247
Commitments and Contingencies (see Note 7)
Eliminations
Current Assets:
Cash and Cash Equivalents	(70,641)		(65,615)	(31,047)	(94,726)
Accounts Receivable	0		0
Prepaid expenses and other	(29)		(29)
Due from Related Parties, Current	(1,032,582)		(818,463)
Total Current Assets	(1,103,252)		(884,107)
Property, Plant and Equipment, Net	0		0
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	(5,009,984)		(4,954,686)
Investment in Subsidiaries	(2,943,682)		(2,891,318)
Goodwill	0		0
Operating lease right-of-use assets (see Note 2.d.)	0
Other	0		0
Total Other Assets, Net	(7,953,666)		(7,846,004)
Total Assets	(9,056,918)		(8,730,111)
Liabilities and Equity
Intercompany Payable	(1,032,582)		(818,463)
Debit Balances Under Cash Pools	(70,641)		(65,615)
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 Operating Lease Liabilities, net of current portion (see Note 2.d.)	0
Long-term Notes Payable to Affiliates and Intercompany Payable	(5,009,984)		(4,954,686)
Other Long-term Liabilities	0		0
Redeemable Noncontrolling Interest	0		0
Total Iron Mountain Incorporated Stockholders' Equity	(2,943,682)		(2,891,318)
Noncontrolling Interests	0		0
Total Equity	(2,943,682)		(2,891,318)
Total Liabilities and Equity	(9,056,918)		(8,730,111)
Parent | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	11		132	3,194	2,433
Accounts Receivable	0		0
Prepaid expenses and other	0		93
Due from Related Parties, Current	0		0
Total Current Assets	11		225
Property, Plant and Equipment, Net	168		190
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	5,009,984		4,954,686
Investment in Subsidiaries	1,926,435		1,885,174
Goodwill	0		0
Operating lease right-of-use assets (see Note 2.d.)	0
Other	5		0
Total Other Assets, Net	6,936,424		6,839,860
Total Assets	6,936,603		6,840,275
Liabilities and Equity
Intercompany Payable	729,843		462,927
Debit Balances Under Cash Pools	0		0
Current Portion of Long-term Debt	0		0
Total Other Current Liabilities	224,825		268,373
Long-term Debt, Net of Current Portion	4,218,887		4,223,822
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)	0
Long-term Notes Payable to Affiliates and Intercompany Payable	0		0
Other Long-term Liabilities	3,647		973
Redeemable Noncontrolling Interest	0		0
Total Iron Mountain Incorporated Stockholders' Equity	1,759,401		1,884,180
Noncontrolling Interests	0		0
Total Equity	1,759,401		1,884,180
Total Liabilities and Equity	6,936,603		6,840,275
Guarantors
Other Assets, Net:
Deposits	76,000		57,200
Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	122,114		61,650	75,061	634,317
Accounts Receivable	37,598		47,900
Prepaid expenses and other	110,223		108,879
Due from Related Parties, Current	1,032,582		818,463
Total Current Assets	1,302,517		1,036,892
Property, Plant and Equipment, Net	2,999,744		3,002,104
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0		0
Investment in Subsidiaries	1,017,247		1,006,144
Goodwill	2,857,855		2,858,539
Operating lease right-of-use assets (see Note 2.d.)	895,920
Other	976,403		979,483
Total Other Assets, Net	5,747,425		4,844,166
Total Assets	10,049,686		8,883,162
Liabilities and Equity
Intercompany Payable	0		0
Debit Balances Under Cash Pools	0		10,612
Current Portion of Long-term Debt	55,940		63,703
Total Other Current Liabilities	632,699		616,826
Long-term Debt, Net of Current Portion	2,212,686		1,877,649
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)	832,007
Long-term Notes Payable to Affiliates and Intercompany Payable	5,009,984		4,954,686
Other Long-term Liabilities	51,575		115,994
Redeemable Noncontrolling Interest	0		0
Total Iron Mountain Incorporated Stockholders' Equity	1,254,795		1,243,692
Noncontrolling Interests	0		0
Total Equity	1,254,795		1,243,692
Total Liabilities and Equity	10,049,686		8,883,162
Non-Guarantors
Other Assets, Net:
Deposits	0		12,700
Non-Guarantors | Reportable legal entities
Current Assets:
Cash and Cash Equivalents	109,991		169,318	$ 395,283	$ 383,675
Accounts Receivable	799,923		798,989
Prepaid expenses and other	100,660		86,797
Due from Related Parties, Current	0		0
Total Current Assets	1,010,574		1,055,104
Property, Plant and Equipment, Net	1,525,671		1,487,263
Other Assets, Net:
Long-term Notes Receivable from Affiliates and Intercompany Receivable	0		0
Investment in Subsidiaries	0		0
Goodwill	1,607,523		1,582,491
Operating lease right-of-use assets (see Note 2.d.)	895,616
Other	720,608		734,063
Total Other Assets, Net	3,223,747		2,316,554
Total Assets	5,759,992		4,858,921
Liabilities and Equity
Intercompany Payable	302,739		355,536
Debit Balances Under Cash Pools	70,641		55,003
Current Portion of Long-term Debt	69,231		62,732
Total Other Current Liabilities	532,467		451,073
Long-term Debt, Net of Current Portion	1,934,164		1,914,946
Long-term Operating Lease Liabilities, net of current portion (see Note 2.d.)	824,652
Long-term Notes Payable to Affiliates and Intercompany Payable	0		0
Other Long-term Liabilities	262,776		300,064
Redeemable Noncontrolling Interest	73,102		70,532
Total Iron Mountain Incorporated Stockholders' Equity	1,688,887		1,647,626
Noncontrolling Interests	1,333		1,409
Total Equity	1,690,220		1,649,035
Total Liabilities and Equity	$ 5,759,992		$ 4,858,921

Selected Consolidated Financi_4

Selected Consolidated Financial Statements of Parent, Guarantors, Canada Company and Non-Guarantors - Statements of Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Consolidating financial statements
Revenues	$ 1,053,863	$ 1,042,458
Intercompany	0	0
Cost of sales (excluding depreciation and amortization)	461,544	448,721
Intercompany	0	0
Income (loss) from discontinued operations, net of tax	(24)	(462)
Operating Expenses:
Selling, General and Administrative	270,559	269,730
Depreciation and Amortization	162,483	160,578
Gain (Loss) on Sale of Assets and Asset Impairment Charges	602	(1,130)
Total Operating Expenses	895,188	877,899
Operating Income (Loss)	158,675	164,559
Interest Expense (Income), Net	102,436	97,626
Other (Income) Expense, Net	15,210	20,151
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	41,029	46,782
Provision (Benefit) for Income Taxes	10,553	1,168
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0
Income (Loss) from Continuing Operations	30,476	45,614
Net income (loss)	30,452	45,152
Less: Net Income (Loss) Attributable to Noncontrolling Interests	891	468
Net income (loss) attributable to Iron Mountain Incorporated	29,561	44,684
Net income (loss)	30,452	45,152
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	18,191	31,651
Change in Fair Value of Interest Rate Swap Agreements	(2,674)	(185)
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0
Total Other Comprehensive Income (Loss)	15,517	31,466
Comprehensive Income (Loss)	45,969	76,618
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1,704	2,027
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	44,265	74,591
Eliminations
Consolidating financial statements
Revenues	(6,077)	(5,696)
Intercompany	(6,077)	(5,696)
Cost of sales (excluding depreciation and amortization)	0	0
Intercompany	(6,077)	(5,696)
Income (loss) from discontinued operations, net of tax	0	0
Operating Expenses:
Selling, General and Administrative	0	0
Depreciation and Amortization	0	0
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0
Total Operating Expenses	(6,077)	(5,696)
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	75,320	90,679
Income (Loss) from Continuing Operations	(75,320)	(90,679)
Net income (loss)	(75,320)	(90,679)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	(75,320)	(90,679)
Net income (loss)	(75,320)	(90,679)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	0	0
Change in Fair Value of Interest Rate Swap Agreements	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	(18,393)	(74,068)
Total Other Comprehensive Income (Loss)	(18,393)	(74,068)
Comprehensive Income (Loss)	(93,713)	(164,747)
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	(93,713)	(164,747)
Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0
Intercompany	0	0
Cost of sales (excluding depreciation and amortization)	0	0
Intercompany	0	0
Income (loss) from discontinued operations, net of tax	0	0
Operating Expenses:
Selling, General and Administrative	87	43
Depreciation and Amortization	23	33
Gain (Loss) on Sale of Assets and Asset Impairment Charges	0	0
Total Operating Expenses	110	76
Operating Income (Loss)	(110)	(76)
Interest Expense (Income), Net	49,625	49,941
Other (Income) Expense, Net	182	(1,157)
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	(49,917)	(48,860)
Provision (Benefit) for Income Taxes	0	0
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	(79,478)	(93,544)
Income (Loss) from Continuing Operations	29,561	44,684
Net income (loss)	29,561	44,684
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	29,561	44,684
Net income (loss)	29,561	44,684
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	6,141	(5,635)
Change in Fair Value of Interest Rate Swap Agreements	(2,674)	(185)
Equity in Other Comprehensive Income (Loss) of Subsidiaries	11,237	35,732
Total Other Comprehensive Income (Loss)	14,704	29,912
Comprehensive Income (Loss)	44,265	74,596
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	44,265	74,596
Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	644,588	627,911
Intercompany	1,154	1,205
Cost of sales (excluding depreciation and amortization)	263,137	246,163
Intercompany	4,923	4,491
Income (loss) from discontinued operations, net of tax	(24)	(422)
Operating Expenses:
Selling, General and Administrative	187,822	185,348
Depreciation and Amortization	102,954	102,446
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(574)	356
Total Operating Expenses	559,410	538,092
Operating Income (Loss)	85,178	89,819
Interest Expense (Income), Net	4,057	(1,508)
Other (Income) Expense, Net	527	1,560
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	80,594	89,767
Provision (Benefit) for Income Taxes	1,301	(6,712)
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	4,158	2,865
Income (Loss) from Continuing Operations	75,135	93,614
Net income (loss)	75,111	93,192
Less: Net Income (Loss) Attributable to Noncontrolling Interests	0	0
Net income (loss) attributable to Iron Mountain Incorporated	75,111	93,192
Net income (loss)	75,111	93,192
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	0	0
Change in Fair Value of Interest Rate Swap Agreements	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	7,156	38,336
Total Other Comprehensive Income (Loss)	7,156	38,336
Comprehensive Income (Loss)	82,267	131,528
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	0	0
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	82,267	131,528
Non-Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	415,352	420,243
Intercompany	4,923	4,491
Cost of sales (excluding depreciation and amortization)	198,407	202,558
Intercompany	1,154	1,205
Income (loss) from discontinued operations, net of tax	0	(40)
Operating Expenses:
Selling, General and Administrative	82,650	84,339
Depreciation and Amortization	59,506	58,099
Gain (Loss) on Sale of Assets and Asset Impairment Charges	(28)	774
Total Operating Expenses	341,745	345,427
Operating Income (Loss)	73,607	74,816
Interest Expense (Income), Net	48,754	(49,193)
Other (Income) Expense, Net	14,501	19,748
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes	10,352	5,875
Provision (Benefit) for Income Taxes	9,252	7,880
Equity in the (Earnings) Losses of Subsidiaries, Net of Tax	0	0
Income (Loss) from Continuing Operations	1,100	(2,005)
Net income (loss)	1,100	(2,045)
Less: Net Income (Loss) Attributable to Noncontrolling Interests	891	468
Net income (loss) attributable to Iron Mountain Incorporated	209	(2,513)
Net income (loss)	1,100	(2,045)
Other Comprehensive Income (Loss):
Foreign Currency Translation Adjustment	12,050	37,286
Change in Fair Value of Interest Rate Swap Agreements	0	0
Equity in Other Comprehensive Income (Loss) of Subsidiaries	0	0
Total Other Comprehensive Income (Loss)	12,050	37,286
Comprehensive Income (Loss)	13,150	35,241
Comprehensive Income (Loss) Attributable to Noncontrolling Interests	1,704	2,027
Comprehensive Income (Loss) Attributable to Iron Mountain Incorporated	11,446	33,214
Storage Rental And Service [Member]
Consolidating financial statements
Revenues	662,974	651,149
Storage Rental And Service [Member] | Eliminations
Consolidating financial statements
Revenues		0
Storage Rental And Service [Member] | Parent | Reportable legal entities
Consolidating financial statements
Revenues		0
Storage Rental And Service [Member] | Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	403,741	396,476
Storage rental
Consolidating financial statements
Revenues	662,974	651,149
Storage rental | Eliminations
Consolidating financial statements
Revenues	0
Storage rental | Non-Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	259,233	254,673
Service
Consolidating financial statements
Revenues	390,889	391,309
Service | Eliminations
Consolidating financial statements
Revenues	0	0
Service | Parent | Reportable legal entities
Consolidating financial statements
Revenues	0	0
Service | Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	239,693	230,230
Service | Non-Guarantors | Reportable legal entities
Consolidating financial statements
Revenues	$ 151,196	$ 161,079

Selected Consolidated Financi_5

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, 2019	Mar. 31, 2018	Dec. 31, 2018
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	$ 117,067	$ 91,568
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	117,067	91,568
Cash Flows from Investing Activities:
Capital expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	(184,765)	(95,605)
Cash paid for acquisitions, net of cash acquired	(39,423)	(1,428,974)
Intercompany loans to subsidiaries	0	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	(67,912)	(18,046)
Proceeds from sales of property and equipment and other, net	105	(19,387)
Payments to Acquire Interest in Joint Venture	(19,222)	0
Cash Flows from Investing Activities—Continuing Operations	(311,217)	(1,562,012)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(311,217)	(1,562,012)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(1,351,242)	(4,410,656)
Proceeds from revolving credit facility, term loan facilities and other debt	1,723,462	5,496,491
Borrowings under cash pools	0	0
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	(498)	(561)
Intercompany loans from parent	0	0
Parent cash dividends	(178,023)	(169,006)
Net (payments) proceeds associated with employee stock-based awards	(5,963)	(5,950)
Net proceeds associated with the Over-Allotment Option	0	76,192
Net proceeds associated with the At the Market (ATM) Program	0	8,716
Payment of debt financing and stock issuance costs	0	(9,974)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	187,736	985,252
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	187,736	985,252
Effect of exchange rates on cash and cash equivalents	2,404	1,984
Increase (Decrease) in cash and cash equivalents	(4,010)	(483,208)
Cash and cash equivalents, including Restricted Cash, beginning of period	165,485	925,699
Cash and cash equivalents, including Restricted Cash, end of period	161,475	442,491
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	161,475		$ 165,485
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 (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	275,034	366,180
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	0
Proceeds from sales of property and equipment and other, net	0	0
Payments to Acquire Interest in Joint Venture	0
Cash Flows from Investing Activities—Continuing Operations	(275,034)	(366,180)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(275,034)	(366,180)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	0	0
Proceeds from revolving credit facility, term loan facilities and other debt	0	0
Borrowings under cash pools	(5,026)	63,679
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	0	0
Intercompany loans from parent	275,034	366,180
Parent cash dividends	0	0
Net (payments) proceeds associated with employee stock-based awards	0	0
Net proceeds associated with the Over-Allotment Option		0
Net proceeds associated with the At the Market (ATM) Program		0
Payment of debt financing and stock issuance costs		0
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	270,008	429,859
Cash Flows from Financing Activities—Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	270,008	429,859
Effect of exchange rates on cash and cash equivalents	0	0
Increase (Decrease) in cash and cash equivalents	(5,026)	63,679
Cash and cash equivalents, including Restricted Cash, beginning of period	(65,615)	(94,726)
Cash and cash equivalents, including Restricted Cash, end of period	(70,641)	(31,047)
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	(70,641)		(65,615)
Parent | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	(68,310)	(66,516)
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	(68,310)	(66,516)
Cash Flows from Investing Activities:
Capital expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	0	0
Cash paid for acquisitions, net of cash acquired	0	0
Intercompany loans to subsidiaries	(252,175)	(157,737)
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	0
Proceeds from sales of property and equipment and other, net	0	0
Payments to Acquire Interest in Joint Venture	0
Cash Flows from Investing Activities—Continuing Operations	252,175	157,737
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	252,175	157,737
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	0	0
Proceeds from revolving credit facility, term loan facilities and other debt	0	0
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
Parent cash dividends	(178,023)	(169,006)
Net (payments) proceeds associated with employee stock-based awards	(5,963)	(5,950)
Net proceeds associated with the Over-Allotment Option		76,192
Net proceeds associated with the At the Market (ATM) Program		8,716
Payment of debt financing and stock issuance costs		(412)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	(183,986)	(90,460)
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	(183,986)	(90,460)
Effect of exchange rates on cash and cash equivalents	0	0
Increase (Decrease) in cash and cash equivalents	(121)	761
Cash and cash equivalents, including Restricted Cash, beginning of period	132	2,433
Cash and cash equivalents, including Restricted Cash, end of period	11	3,194
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	11		132
Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	116,235	96,674
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	116,235	96,674
Cash Flows from Investing Activities:
Capital expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	(84,766)	(62,148)
Cash paid for acquisitions, net of cash acquired	(9,508)	(1,315,549)
Intercompany loans to subsidiaries	(22,859)	(208,443)
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	(49,301)	(11,874)
Proceeds from sales of property and equipment and other, net	36	(19,466)
Payments to Acquire Interest in Joint Venture	(19,222)
Cash Flows from Investing Activities—Continuing Operations	(139,902)	(1,200,594)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(139,902)	(1,200,594)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(410,563)	(2,308,119)
Proceeds from revolving credit facility, term loan facilities and other debt	734,243	3,067,988
Borrowings under cash pools	(10,612)	(51,946)
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	0	0
Intercompany loans from parent	(228,937)	(154,184)
Parent cash dividends	0	0
Net (payments) proceeds associated with employee stock-based awards	0	0
Net proceeds associated with the Over-Allotment Option		0
Net proceeds associated with the At the Market (ATM) Program		0
Payment of debt financing and stock issuance costs		(9,075)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	84,131	544,664
Cash Flows from Financing Activities—Discontinued Operations	0	0
Net Cash Provided by (Used in) Financing Activities	84,131	544,664
Effect of exchange rates on cash and cash equivalents	0	0
Increase (Decrease) in cash and cash equivalents	60,464	(559,256)
Cash and cash equivalents, including Restricted Cash, beginning of period	61,650	634,317
Cash and cash equivalents, including Restricted Cash, end of period	122,114	75,061
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	122,114		61,650
Non-Guarantors | Reportable legal entities
Cash Flows from Operating Activities:
Cash Flows from Operating Activities—Continuing Operations	69,142	61,410
Cash Flows from Operating Activities—Discontinued Operations	0	0
Cash Flows from Operating Activities	69,142	61,410
Cash Flows from Investing Activities:
Capital expenditures (see Liquidity and Capital Resources section of Management's Discussion & Analysis of Financial Condition and Results of Operations)	(99,999)	(33,457)
Cash paid for acquisitions, net of cash acquired	(29,915)	(113,425)
Intercompany loans to subsidiaries	0	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	(18,611)	(6,172)
Proceeds from sales of property and equipment and other, net	69	79
Payments to Acquire Interest in Joint Venture	0
Cash Flows from Investing Activities—Continuing Operations	(148,456)	(152,975)
Cash Flows from Investing Activities—Discontinued Operations	0	0
Cash Flows from Investing Activities	(148,456)	(152,975)
Cash Flows from Financing Activities:
Repayment of revolving credit facility, term loan facilities and other debt	(940,679)	(2,102,537)
Proceeds from revolving credit facility, term loan facilities and other debt	989,219	2,428,503
Borrowings under cash pools	(15,638)	11,733
Debt financing from (repayment to) and equity contribution from (distribution to) noncontrolling interests, net	(498)	(561)
Intercompany loans from parent	(46,097)	(211,996)
Parent cash dividends	0	0
Net (payments) proceeds associated with employee stock-based awards	0	0
Net proceeds associated with the Over-Allotment Option		0
Net proceeds associated with the At the Market (ATM) Program		0
Payment of debt financing and stock issuance costs		(487)
Net Cash Provided by (Used in) Financing Activities, Continuing Operations	17,583	101,189
Cash Flows from Financing Activities—Discontinued Operations		0
Net Cash Provided by (Used in) Financing Activities	17,583	101,189
Effect of exchange rates on cash and cash equivalents	2,404	1,984
Increase (Decrease) in cash and cash equivalents	(59,327)	11,608
Cash and cash equivalents, including Restricted Cash, beginning of period	169,318	383,675
Cash and cash equivalents, including Restricted Cash, end of period	109,991	$ 395,283
Cash, Cash Equivalents, Restricted Cash and Restricted Cash Equivalents	$ 109,991		$ 169,318

Segment Information - Additiona

Segment Information - Additional Information (Details)	12 Months Ended
	Dec. 31, 2018segment
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, 2019	Mar. 31, 2018	Dec. 31, 2018
Segment information
Revenues	$ 1,053,863	$ 1,042,458
Depreciation and Amortization	162,483	160,578
Depreciation	114,611	113,432
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	47,872	47,146
Adjusted EBITDA	324,506	343,015
Assets	13,689,363	11,998,149	$ 11,852,247
Expenditures for Segment Assets	292,100	1,542,625
Capital Expenditures	184,765	95,605
Cash Paid for Acquisitions, Net of Cash Acquired	39,423	1,428,974
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	67,912	18,046
North American Records and Information Management business
Segment information
Revenues	527,380	526,843
Depreciation and Amortization	60,002	62,752
Depreciation	45,752	49,138
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	14,250	13,614
Adjusted EBITDA	223,683	225,738
Assets	5,823,817	5,030,238
Expenditures for Segment Assets	56,265	43,181
Capital Expenditures	28,688	29,870
Cash Paid for Acquisitions, Net of Cash Acquired	9,876	1,551
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	17,701	11,760
North American Data Management Business
Segment information
Revenues	96,747	99,964
Depreciation and Amortization	10,202	10,104
Depreciation	8,013	8,023
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	2,189	2,081
Adjusted EBITDA	50,552	53,852
Assets	902,514	833,690
Expenditures for Segment Assets	5,632	6,853
Capital Expenditures	5,632	6,853
Cash Paid for Acquisitions, Net of Cash Acquired	0	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	0
Western European Business
Segment information
Revenues	128,753	134,075
Depreciation and Amortization	15,257	17,556
Depreciation	10,947	12,758
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	4,310	4,798
Adjusted EBITDA	39,209	43,966
Assets	1,414,878	917,155
Expenditures for Segment Assets	30,101	7,480
Capital Expenditures	2,116	6,047
Cash Paid for Acquisitions, Net of Cash Acquired	11,484	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	16,501	1,433
Other International Business
Segment information
Revenues	200,956	210,767
Depreciation and Amortization	30,599	31,873
Depreciation	18,218	19,064
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	12,381	12,809
Adjusted EBITDA	58,124	60,747
Assets	2,686,938	2,441,685
Expenditures for Segment Assets	31,254	32,160
Capital Expenditures	15,149	25,142
Cash Paid for Acquisitions, Net of Cash Acquired	14,543	3,208
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	1,562	3,810
Global Data Center Business
Segment information
Revenues	61,536	46,603
Depreciation and Amortization	31,632	22,268
Depreciation	19,013	11,380
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	12,619	10,888
Adjusted EBITDA	26,011	20,790
Assets	2,310,001	1,875,766
Expenditures for Segment Assets	153,705	1,438,012
Capital Expenditures	121,557	13,111
Cash Paid for Acquisitions, Net of Cash Acquired	0	1,424,215
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	32,148	686
Corporate and Other
Segment information
Revenues	38,491	24,206
Depreciation and Amortization	14,791	16,025
Depreciation	12,668	13,069
Revenue reduction associated with amortization of customer inducements and above- and below-market leases	2,123	2,956
Adjusted EBITDA	(73,073)	(62,078)
Assets	551,215	899,615
Expenditures for Segment Assets	15,143	14,939
Capital Expenditures	11,623	14,582
Cash Paid for Acquisitions, Net of Cash Acquired	3,520	0
Payments to Acquire Customer Relationships, Customer Inducements and Contract Fulfillment Costs	0	357
Records Management [Member]
Segment information
Revenues	733,396	740,495
Records Management [Member] | North American Records and Information Management business
Segment information
Revenues	427,367	435,002
Records Management [Member] | North American Data Management Business
Segment information
Revenues	0	0
Records Management [Member] | Western European Business
Segment information
Revenues	108,707	113,759
Records Management [Member] | Other International Business
Segment information
Revenues	172,977	181,330
Records Management [Member] | Global Data Center Business
Segment information
Revenues	0	0
Records Management [Member] | Corporate and Other
Segment information
Revenues	24,345	10,404
Storage rental
Segment information
Revenues	662,974	651,149
Storage rental | North American Records and Information Management business
Segment information
Revenues	306,986	304,819
Storage rental | North American Data Management Business
Segment information
Revenues	66,572	69,246
Storage rental | Western European Business
Segment information
Revenues	80,695	83,952
Storage rental | Other International Business
Segment information
Revenues	129,473	131,747
Storage rental | Global Data Center Business
Segment information
Revenues	59,718	45,495
Storage rental | Corporate and Other
Segment information
Revenues	19,530	15,890
Service
Segment information
Revenues	390,889	391,309
Service | North American Records and Information Management business
Segment information
Revenues	220,394	222,024
Service | North American Data Management Business
Segment information
Revenues	30,175	30,718
Service | Western European Business
Segment information
Revenues	48,058	50,123
Service | Other International Business
Segment information
Revenues	71,483	79,020
Service | Global Data Center Business
Segment information
Revenues	1,818	1,108
Service | Corporate and Other
Segment information
Revenues	18,961	8,316
Data Management [Member]
Segment information
Revenues	147,248	152,093
Data Management [Member] | North American Records and Information Management business
Segment information
Revenues	0	0
Data Management [Member] | North American Data Management Business
Segment information
Revenues	93,989	97,594
Data Management [Member] | Western European Business
Segment information
Revenues	19,886	20,219
Data Management [Member] | Other International Business
Segment information
Revenues	19,227	20,478
Data Management [Member] | Global Data Center Business
Segment information
Revenues	0	0
Data Management [Member] | Corporate and Other
Segment information
Revenues	14,146	13,802
Information Destruction [Member]
Segment information
Revenues	111,683	103,267
Information Destruction [Member] | North American Records and Information Management business
Segment information
Revenues	100,013	91,841
Information Destruction [Member] | North American Data Management Business
Segment information
Revenues	2,758	2,370
Information Destruction [Member] | Western European Business
Segment information
Revenues	160	97
Information Destruction [Member] | Other International Business
Segment information
Revenues	8,752	8,959
Information Destruction [Member] | Global Data Center Business
Segment information
Revenues	0	0
Information Destruction [Member] | Corporate and Other
Segment information
Revenues	0	0
Data Center Business
Segment information
Revenues	61,536	46,603
Data Center Business | North American Records and Information Management business
Segment information
Revenues	0	0
Data Center Business | North American Data Management Business
Segment information
Revenues	0	0
Data Center Business | Western European Business
Segment information
Revenues	0	0
Data Center Business | Other International Business
Segment information
Revenues	0	0
Data Center Business | Global Data Center Business
Segment information
Revenues	61,536	46,603
Data Center Business | Corporate and Other
Segment information
Revenues	$ 0	$ 0

Segment Information - Reconcili

Segment Information - Reconciliation to Income from Continuing Operations (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Reconciliation of Adjusted EBITDA to income from continuing operations
Adjusted EBITDA	$ 324,506	$ 343,015
Provision (Benefit) for Income Taxes	10,553	1,168
Less: Depreciation and Amortization	162,483	160,578
Gain (Loss) on Sale of Assets and Asset Impairment Charges	602	(1,130)
Income (Loss) from Continuing Operations	30,476	45,614
Interest Expense (Income), Net	102,436	97,626
Other Expense (Income), Net	15,210	20,151
Recall Transaction and IODC Transaction [Member]
Reconciliation of Adjusted EBITDA to income from continuing operations
Total Significant Acquisition Costs	$ 2,746	$ 19,008

Commitments and Contingencies (

Commitments and Contingencies (Details) $ in Thousands	Mar. 31, 2019USD ($)
Insurance Settlement
Commitments and Contingencies
Reasonably possible additional losses	$ 17,500

Stockholders' Equity Matters -

Stockholders' Equity Matters - Dividends Declared (Details)	Apr. 02, 2019USD ($)	Feb. 07, 2019$ / shares	Oct. 02, 2018USD ($)	Jul. 24, 2018$ / shares	Jul. 02, 2018USD ($)	May 24, 2018$ / shares	Apr. 02, 2018USD ($)	Feb. 14, 2018$ / shares	Dec. 15, 2015USD ($)	Oct. 29, 2015$ / shares	Oct. 31, 2017USD ($)	Mar. 31, 2019USD ($)$ / sharesshares	Mar. 31, 2018USD ($)	Dec. 31, 2018$ / sharesshares
Subsidiary or Equity Method Investee [Line Items]
Dividends Declared per Common Share (in dollars per share) | $ / shares		$ 0.6110		$ 0.5875		$ 0.5875		$ 0.5875		$ 0.6110
Dividends, Common Stock			$ 168,148,000		$ 168,078,000		$ 167,969,000		$ 174,935,000			$ 176,460,000	$ 169,044,000
Common stock, issued shares | shares												286,829,854		286,321,009
Common Stock, Par or Stated Value Per Share | $ / shares												$ 0.01		$ 0.01
Subsequent Event
Subsidiary or Equity Method Investee [Line Items]
Dividends, Common Stock	$ 175,242,000
At The Market (ATM) Equity Program [Member]
Subsidiary or Equity Method Investee [Line Items]
Sale of Stock, Authorized Amount											$ 500,000,000
Sale of Stock, Remaining Aggregate Sale Price Of Stock Available For Distribution												$ 431,200,000
Number Of Banks											10
Sale of Stock, Number of Shares Issued in Transaction | shares												0

Divestments - (Details)

Divestments - (Details) - USD ($) $ in Thousands	Mar. 19, 2019	Mar. 31, 2019	Mar. 31, 2018
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Interest in Joint Venture		$ 19,222	$ 0
Consumer Storage | Disposal Group, Not Discontinued Operations
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Gain on disposal		4,200
Corporate Joint Venture | Makespace
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Payments to Acquire Interest in Joint Venture	$ 20,000
Equity method investment, ownership percentage	34.00%
Equity method investment, fair value		$ 27,500

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, 2019	Mar. 31, 2018
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 2,746	$ 19,008
Cost of sales (excluding depreciation and amortization)
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	898	296
Selling, general and administrative expenses
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 1,848	$ 18,712

Significant Acquisition Costs_2

Significant Acquisition Costs Significant Acquisition Costs by Segment (Details) - Recall Transaction and IODC Transaction [Member] - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2019	Mar. 31, 2018
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 2,746	$ 19,008
North American Records and Information Management business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	378	584
North American Data Management Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	0	0
Western European Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	0	2,152
Other International Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	502	537
Global Data Center Business
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	143	10,181
Corporate and Other
Business Combination, Separately Recognized Transactions [Line Items]
Total Significant Acquisition Costs	$ 1,723	$ 5,554

Uncategorized Items - irm-20190

Label	Element	Value
Accounting Standards Update 2014-09 [Member] | Accumulated Distributions in Excess of Net Income [Member]
Cumulative Effect of New Accounting Principle in Period of Adoption	us-gaap_CumulativeEffectOfNewAccountingPrincipleInPeriodOfAdoption	$ (29,461,000)