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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2020
Accounting Policies [Abstract] |
Roll forward of allowance for doubtful accounts and credit memo reserves | Rollforward of allowance for doubtful accounts and credit memo reserves is as follows:
YEAR ENDED DECEMBER 31, |  | BALANCE AT BEGINNING OF THE YEAR |  | CREDIT MEMOS CHARGED TO REVENUE |  | ALLOWANCE FOR BAD DEBTS CHARGED TO EXPENSE |  | DEDUCTIONS AND OTHER(1) |  | BALANCE AT END OF THE YEAR
2020 |  | $ | 42,856 |  |  | $ | 55,118 |  |  | $ | 34,411 |  |  | $ | (75,404) |  |  | $ | 56,981 |
2019 |  | 43,584 |  |  | 51,846 |  |  | 19,389 |  |  | (71,963) |  |  | 42,856 |
2018 |  | 46,648 |  |  | 36,329 |  |  | 18,625 |  |  | (58,018) |  |  | 43,584 |
(1)Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.
Components of prepaid expenses | Accrued expenses, with items greater than 5% of total current liabilities are shown separately, and consist of the following:
|  | DECEMBER 31,
DESCRIPTION |  | 2020 |  | 2019
Interest |  | $ | 131,448 |  |  | $ | 97,987 |
Sales tax and VAT payable |  | 131,780 |  |  | 115,352 |
Dividends |  | 187,867 |  |  | 186,021 |
Operating lease liabilities |  | 250,239 |  |  | 223,249 |
Other |  | 444,954 |  |  | 339,143 |
Accrued expenses |  | $ | 1,146,288 |  |  | $ | 961,752 |
Property, Plant and Equipment at cost | Property, plant and equipment are stated at cost and depreciated using the straight-line method with the following useful lives (in years):
DESCRIPTION | RANGE
Buildings and building improvements | 5 to 40
Leasehold improvements | 5 to 10 or life of the lease (whichever is shorter)
Racking | 1 to 20 or life of the lease (whichever is shorter)
Warehouse equipment/vehicles | 1 to 10
Furniture and fixtures | 1 to 10
Computer hardware and software | 2 to 5
Property, plant and equipment (including financing leases in the respective category), at cost, consist of the following:
|  | DECEMBER 31,
DESCRIPTION |  | 2020 |  | 2019
Land |  | $ | 354,395 |  |  | $ | 448,566 |
Buildings and building improvements |  | 3,040,253 |  |  | 3,029,309 |
Leasehold improvements |  | 969,273 |  |  | 852,022 |
Racking |  | 2,083,199 |  |  | 2,040,832 |
Warehouse equipment/vehicles |  | 499,787 |  |  | 483,218 |
Furniture and fixtures |  | 52,978 |  |  | 54,275 |
Computer hardware and software |  | 746,993 |  |  | 689,261 |
Construction in progress |  | 499,459 |  |  | 451,423 |
Property, plant and equipment |  | $ | 8,246,337 |  |  | $ | 8,048,906 |
Schedule of operating and financing lease right-of-use assets and lease liabilities | Operating and financing lease right-of-use assets and lease liabilities as of December 31, 2020 and 2019 are as follows:
|  | DECEMBER 31,
DESCRIPTION |  | 2020 |  | 2019
Assets: |  |  |  |
Operating lease right-of-use assets(1) |  | $ | 2,196,502 |  |  | $ | 1,869,101 |
Financing lease right-of-use assets, net of accumulated depreciation(2)(3) |  | 310,534 |  |  | 327,215 |
Liabilities: |  |  |  |
Current |  |  |  |
Operating lease liabilities |  | $ | 250,239 |  |  | $ | 223,249 |
Financing lease liabilities(3) |  | 43,149 |  |  | 46,582 |
Long-term |  |  |  |
Operating lease liabilities |  | 2,044,598 |  |  | 1,728,686 |
Financing lease liabilities(3) |  | 323,162 |  |  | 320,600 |
(1)At December 31, 2020 and 2019, these assets are comprised of approximately 99% real estate related assets (which include land, buildings and racking) and 1% non-real estate related assets (which include warehouse equipment, vehicles, furniture and fixtures and computer hardware and software). (2)At December 31, 2020, these assets are comprised of approximately 72% real estate related assets and 28% non-real estate related assets. At December 31, 2019, these assets are comprised of approximately 69% real estate related assets and 31% non-real estate related assets. (3)Financing lease right-of-use assets, current financing lease liabilities and long-term financing lease liabilities are included within Property, Plant and Equipment, Net, Current portion of long-term debt and Long-term Debt, net of current portion, respectively, within our Consolidated Balance Sheets.
Schedule of lease terms and discount rates/Other lease information | The components of the lease expense for the years ended December 31, 2020 and 2019 are as follows:
|  | YEAR ENDED DECEMBER 31,
DESCRIPTION |  | 2020 |  | 2019
Operating lease cost(1) |  | $ | 499,464 |  |  | $ | 459,619 |
Financing lease cost: |  |  |  |
Depreciation of financing lease right-of-use assets |  | $ | 51,629 |  |  | $ | 59,258 |
Interest expense for financing lease liabilities |  | 19,942 |  |  | 21,031 |
(1)Operating lease cost, the majority of which is included in Cost of sales, includes variable lease costs of $111,501 and $105,922 for the years ended December 31, 2020 and 2019, respectively. Weighted average remaining lease terms and discount rates as of December 31, 2020 and 2019 are as follows:
| DECEMBER 31, 2020 |  | DECEMBER 31, 2019
| OPERATING LEASES |  | FINANCING LEASES |  | OPERATING LEASES |  | FINANCING LEASES
Remaining Lease Term | 11.1 years |  | 11.5 years |  | 11.0 years |  | 11.6 years
Discount Rate | 6.9 | % |  | 5.9 | % |  | 7.1 | % |  | 5.7 | %
Supplemental cash flow information relating to our leases for the years ended December 31, 2020 and 2019 is as follows:
|  | YEAR ENDED DECEMBER 31,
CASH PAID FOR AMOUNTS INCLUDED IN MEASUREMENT OF LEASE LIABILITIES: |  | 2020 |  | 2019
Operating cash flows used in operating leases |  | $ | 360,088 |  |  | $ | 338,059 |
Operating cash flows used in financing leases (interest) |  | 19,942 |  |  | 21,031 |
Financing cash flows used in financing leases |  | 47,829 |  |  | 58,033 |
NON-CASH ITEMS: |  |  |  |
Operating lease modifications and reassessments |  | $ | 143,382 |  |  | $ | 108,023 |
New operating leases (including acquisitions and sale-leaseback transactions) |  | 370,011 |  |  | 170,464 |
Operating lease maturity table | The estimated minimum future lease payments as of December 31, 2020, are as follows:
YEAR |  | OPERATING LEASES(1) |  | SUBLEASE INCOME |  | FINANCING LEASES(1)
2021 |  | $ | 380,607 |  |  | $ | (6,208) |  |  | $ | 62,669 |
2022 |  | 362,970 |  |  | (5,752) |  |  | 54,499 |
2023 |  | 334,893 |  |  | (5,222) |  |  | 45,557 |
2024 |  | 307,039 |  |  | (3,771) |  |  | 38,051 |
2025 |  | 281,487 |  |  | (1,661) |  |  | 32,261 |
Thereafter |  | 1,687,706 |  |  | (6,229) |  |  | 268,542 |
Total minimum lease payments |  | 3,354,702 |  |  | $ | (28,843) |  |  | 501,579 |
Less amounts representing interest or imputed interest |  | (1,059,865) |  |  |  |  | (135,268) |
Present value of lease obligations |  | $ | 2,294,837 |  |  |  |  | $ | 366,311 |
(1)Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes.
Finance lease maturity table | The estimated minimum future lease payments as of December 31, 2020, are as follows:
YEAR |  | OPERATING LEASES(1) |  | SUBLEASE INCOME |  | FINANCING LEASES(1)
2021 |  | $ | 380,607 |  |  | $ | (6,208) |  |  | $ | 62,669 |
2022 |  | 362,970 |  |  | (5,752) |  |  | 54,499 |
2023 |  | 334,893 |  |  | (5,222) |  |  | 45,557 |
2024 |  | 307,039 |  |  | (3,771) |  |  | 38,051 |
2025 |  | 281,487 |  |  | (1,661) |  |  | 32,261 |
Thereafter |  | 1,687,706 |  |  | (6,229) |  |  | 268,542 |
Total minimum lease payments |  | 3,354,702 |  |  | $ | (28,843) |  |  | 501,579 |
Less amounts representing interest or imputed interest |  | (1,059,865) |  |  |  |  | (135,268) |
Present value of lease obligations |  | $ | 2,294,837 |  |  |  |  | $ | 366,311 |
(1)Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes.
Schedule of carrying value of goodwill, net for each of the reporting units | The carrying value of goodwill, net for each of our reporting units described above as of December 31, 2019 is as follows:
SEGMENT | REPORTING UNIT | CARRYING VALUE AS OF DECEMBER 31, 2019
Global RIM (as defined in Note 10) Business | North America RIM | $ | 2,715,550 |
Europe RIM | 572,482 |
Latin America RIM | 140,897 |
ANZ RIM | 274,913 |
Asia RIM | 239,059 |
Global Data Center Business | Global Data Center | 424,568 |
Corporate and Other Business | Fine Arts | 37,533 |
Entertainment Services | 34,102 |
Technology Escrow Services | 46,105 |
Total |  | $ | 4,485,209 |
The carrying value of goodwill, net for each of our reporting units described above as of December 31, 2020 is as follows:
SEGMENT | REPORTING UNIT | CARRYING VALUE AS OF DECEMBER 31, 2020
Global RIM Business | North America RIM | $ | 2,719,182 |
Europe RIM | 641,621 |
Latin America RIM | 117,834 |
ANZ RIM | 301,251 |
Asia RIM | 244,294 |
Global Data Center Business | Global Data Center | 436,987 |
Corporate and Other Business | Fine Arts | 15,176 |
Entertainment Services | 35,159 |
Technology Escrow Services | 46,105 |
Total |  | $ | 4,557,609 |
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 years ended December 31, 2020 and 2019 are as follows:
| GLOBAL RIM BUSINESS |  | GLOBAL DATA CENTER BUSINESS |  | CORPORATE AND OTHER BUSINESS |  | TOTAL CONSOLIDATED
Goodwill balance, net of accumulated amortization, as of December 31, 2018 | $ | 3,899,210 |  |  | $ | 425,956 |  |  | $ | 115,864 |  |  | $ | 4,441,030 |
Tax deductible goodwill acquired during the year | 16,450 |  |  | — |  |  | — |  |  | 16,450 |
Non-tax deductible goodwill acquired during the year | 11,228 |  |  | — |  |  | 1,904 |  |  | 13,132 |
Fair value and other adjustments | 4,439 |  |  | 258 |  |  | (417) |  |  | 4,280 |
Currency effects | 11,574 |  |  | (1,646) |  |  | 389 |  |  | 10,317 |
Goodwill balance, net of accumulated amortization, as of December 31, 2019 | 3,942,901 |  |  | 424,568 |  |  | 117,740 |  |  | 4,485,209 |
Non-tax deductible goodwill acquired during the year | 54,258 |  |  | — |  |  | — |  |  | 54,258 |
Goodwill impairment | — |  |  | — |  |  | (23,000) |  |  | (23,000) |
Fair value and other adjustments | (3,815) |  |  | — |  |  | 403 |  |  | (3,412) |
Currency effects | 30,838 |  |  | 12,419 |  |  | 1,297 |  |  | 44,554 |
Goodwill balance, net of accumulated amortization, as of December 31, 2020 | $ | 4,024,182 |  |  | $ | 436,987 |  |  | $ | 96,440 |  |  | $ | 4,557,609 |
Accumulated Goodwill Impairment Balance as of December 31, 2019 | $ | 132,409 |  |  | $ | — |  |  | $ | 3,011 |  |  | $ | 135,420 |
Accumulated Goodwill Impairment Balance as of December 31, 2020 | $ | 132,409 |  |  | $ | — |  |  | $ | 26,011 |  |  | $ | 158,420 |
Components of Gain/Loss on Sale/Disposal of Property, Plant and Equipment |
| YEAR ENDED DECEMBER 31,
| 2020 | 2019 | 2018
Consolidated gain on disposal/write-down of property, plant and equipment, net | $ | 363,537 |  | $ | 63,824 |  | $ | 73,622 |
The gains primarily consisted of: | •Gains associated with sale-leaseback transactions of approximately $342,100, of which (i) approximately $265,600 relates to the sale-leaseback transactions of 14 facilities in the United States during the fourth quarter of 2020 and (ii) approximately $76,400 relates to the sale-leaseback transactions of two facilities in the United States during the third quarter of 2020, each as part of our program to monetize a small portion of our industrial real estate assets. The terms for these leases are consistent with the terms of our lease portfolio, which are disclosed in Note 2.i. •Gains of approximately $24,100 associated with the Frankfurt JV Transaction (as defined in Note 3) | •Gains associated with sale and sale-leaseback transactions of approximately $67,800 in the United States •The sale of certain land and buildings of approximately $36,000 in the United Kingdom Partially offset by losses from: •The impairment charge on the assets associated with the select offerings within our Iron Mountain Iron Cloud ("Iron Cloud") portfolio and loss on the subsequent sale of certain IT infrastructure assets and rights to certain hardware and maintenance contracts used to deliver these Iron Cloud offerings of approximately $25,000. •The write-down of certain property, plant and equipment of approximately $15,700 in the United States. | •Gain on sale of real estate of approximately $63,800 in the United Kingdom •Gains associated with the involuntary conversion of assets included in a facility that we own in Argentina partially destroyed in a fire in 2014, of approximately $8,800 during the fourth quarter of 2018
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 years ended December 31, 2020, 2019 and 2018 is as follows:
|  | YEAR ENDED DECEMBER 31,
|  | 2020 |  | 2019 |  | 2018
Amortization expense included in depreciation and amortization associated with: |  |  |  |  |  |
Customer relationship intangible assets |  | $ | 117,514 |  |  | $ | 117,972 |  |  | $ | 113,782 |
Data center in-place leases and tenant relationships |  | 42,637 |  |  | 46,696 |  |  | 43,061 |
Third-party commissions asset and other finite-lived intangible assets |  | 7,004 |  |  | 7,957 |  |  | 5,713 |
Revenue reduction associated with amortization of: |  |  |  |  |  |
Customer inducements and data center above-market and below-market leases |  | $ | 9,878 |  |  | $ | 13,703 |  |  | $ | 16,281 |
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years | Estimated amortization expense for existing finite-lived intangible assets (excluding Contract Fulfillment Costs, as defined and disclosed in Note 2.r.) is as follows:
|  | ESTIMATED AMORTIZATION
YEAR |  | INCLUDED IN DEPRECIATION AND AMORTIZATION |  | REVENUE REDUCTION ASSOCIATED WITH CUSTOMER INDUCEMENTS AND DATA CENTER ABOVE-MARKET AND BELOW-MARKET LEASES
2021 |  | $ | 168,756 |  |  | $ | 7,603 |
2022 |  | 139,983 |  |  | 5,010 |
2023 |  | 135,262 |  |  | 3,084 |
2024 |  | 130,298 |  |  | 1,453 |
2025 |  | 127,771 |  |  | 508 |
Thereafter |  | 625,052 |  |  | 842 |
Assets and liabilities carried at fair value measured on a recurring basis | The assets and liabilities carried at fair value and measured on a recurring basis as of December 31, 2020 and 2019, respectively, are as follows:
|  |  |  | FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2020 USING
DESCRIPTION |  | TOTAL CARRYING VALUE AT DECEMBER 31, 2020 |  | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) |  | SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) |  | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds(1) |  | $ | 62,657 |  |  | $ | — |  |  | $ | 62,657 |  |  | $ | — |
Time Deposits(1) |  | 2,121 |  |  | — |  |  | 2,121 |  |  | — |
Trading Securities |  | 10,892 |  |  | 10,636 |  | (2) | 256 |  | (3) | — |
Derivative Liabilities(4) |  | 49,703 |  |  | — |  |  | 49,703 |  |  | — |
|  |  |  | FAIR VALUE MEASUREMENTS AT DECEMBER 31, 2019 USING
DESCRIPTION |  | TOTAL CARRYING VALUE AT DECEMBER 31, 2019 |  | QUOTED PRICES IN ACTIVE MARKETS (LEVEL 1) |  | SIGNIFICANT OTHER OBSERVABLE INPUTS (LEVEL 2) |  | SIGNIFICANT UNOBSERVABLE INPUTS (LEVEL 3)
Money Market Funds(1) |  | $ | 13,653 |  |  | $ | — |  |  | $ | 13,653 |  |  | $ | — |
Trading Securities |  | 10,732 |  |  | 10,168 |  | (2) | 564 |  | (3) | — |
Derivative Liabilities(4) |  | 9,756 |  |  | — |  |  | 9,756 |  |  | — |
(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 include (i) interest rate swap agreements, including forward-starting interest rate swap agreements, to limit our exposure to changes in interest rates on a portion of our floating rate indebtedness and (ii) cross-currency swap agreements to hedge the variability of exchange rates impacts between the United States dollar and the Euro and certain of our Euro denominated subsidiaries. Our derivative financial instruments are measured using industry standard valuation models using market-based observable inputs, including interest rate curves, forward and spot prices for currencies and implied volatilities. Credit risk is also factored into the determination of the fair value of our derivative financial instruments. See Note 5 for additional information on our derivative financial instruments.
Schedule of changes in accumulated other comprehensive items, net | The changes in accumulated other comprehensive items, net for the years ended December 31, 2020, 2019 and 2018 are as follows:
| FOREIGN CURRENCY TRANSLATION AND OTHER ADJUSTMENTS |  | CHANGE IN FAIR VALUE OF DERIVATIVE INSTRUMENTS |  | TOTAL
Balance as of December 31, 2017 | $ | (103,989) |  |  | $ | — |  |  | $ | (103,989) |
Other comprehensive (loss) income: |  |  |  |  |
Foreign currency translation and other adjustments | (160,702) |  |  | — |  |  | (160,702) |
Change in fair value of derivative instruments | — |  |  | (973) |  |  | (973) |
Total other comprehensive (loss) income | (160,702) |  |  | (973) |  |  | (161,675) |
Balance as of December 31, 2018 | (264,691) |  |  | (973) |  |  | (265,664) |
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation and other adjustments | 11,866 |  |  | — |  |  | 11,866 |
Change in fair value of derivative instruments | — |  |  | (8,783) |  |  | (8,783) |
Total other comprehensive income (loss) | 11,866 |  |  | (8,783) |  |  | 3,083 |
Balance as of December 31, 2019 | (252,825) |  |  | (9,756) |  |  | (262,581) |
Other comprehensive income (loss): |  |  |  |  |
Foreign currency translation and other adjustments | 46,635 |  |  | — |  |  | 46,635 |
Change in fair value of derivative instruments | — |  |  | (39,947) |  |  | (39,947) |
Total other comprehensive income (loss) | 46,635 |  |  | (39,947) |  |  | 6,688 |
Balance as of December 31, 2020 | $ | (206,190) |  |  | $ | (49,703) |  |  | $ | (255,893) |
Schedule of amortization expense associated with software - property, plant and equipment | During the years ended December 31, 2020, 2019 and 2018, capitalized interest is as follows:
|  | YEAR ENDED DECEMBER 31,
|  | 2020 |  | 2019 |  | 2018
Capitalized interest |  | $ | 14,321 |  |  | $ | 15,980 |  |  | $ | 3,732 |
During the years ended December 31, 2020, 2019 and 2018, capitalized costs associated with the development of internal use computer software projects are as follows:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Capitalized costs associated with the development of internal use computer software projects | $ | 38,329 |  |  | $ | 34,650 |  |  | $ | 29,407 |
Contract Fulfillment Costs, which are included as a component of Other within Other Assets, Net, as of December 31, 2020 and 2019 are as follows:
|  | DECEMBER 31, 2020 |  | DECEMBER 31, 2019
DESCRIPTION |  | GROSS CARRYING AMOUNT |  | ACCUMULATED AMORTIZATION |  | NET CARRYING AMOUNT |  | GROSS CARRYING AMOUNT |  | ACCUMULATED AMORTIZATION |  | NET CARRY ING AMOUNT
Intake Costs asset |  | $ | 63,721 |  |  | $ | (33,352) |  |  | $ | 30,369 |  |  | $ | 41,224 |  |  | $ | (23,579) |  |  | $ | 17,645 |
Commissions asset |  | 91,069 |  |  | (38,787) |  |  | 52,282 |  |  | 68,008 |  |  | (27,178) |  |  | 40,830 |
Amortization expense associated with the Intake Costs and Commissions assets for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | YEAR ENDED DECEMBER 31,
DESCRIPTION |  | 2020 |  | 2019 |  | 2018
Intake Costs asset |  | $ | 13,300 |  |  | $ | 10,144 |  |  | $ | 10,380 |
Commissions asset |  | 24,052 |  |  | 19,109 |  |  | 13,838 |
Contract with customer, future amortization expense | Estimated amortization expense for Contract Fulfillment Costs is as follows:
YEAR |  | ESTIMATED AMORTIZATION
2021 |  | $ | 38,954 |
2022 |  | 24,861 |
2023 |  | 18,836 |
Schedule of deferred revenue liabilities | Deferred revenue liabilities are reflected as follows in our Consolidated Balance Sheets:
|  |  | DECEMBER 31, |
DESCRIPTION | LOCATION IN BALANCE SHEET |  | 2020 |  | 2019 |
Deferred revenue - Current | Deferred revenue |  | $ | 295,785 |  |  | $ | 274,036 |  |
Deferred revenue - Long-term | Other Long-term Liabilities |  | 35,612 |  |  | 36,029 |  |
Schedule of revenue | Storage rental revenue, including revenue associated with power and connectivity, associated with our Global Data Center Business for the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | YEAR ENDED DECEMBER 31,
|  | 2020 |  | 2019 |  | 2018
Storage rental revenue(1) |  | $ | 263,695 |  |  | $ | 246,925 |  |  | $ | 218,675 |
(1)Revenue associated with power and connectivity included within storage rental revenue was $47,451, $43,269 and $38,749 for the years ended December 31, 2020, 2019 and 2018, respectively.
Payments to be received | The future minimum lease payments we expect to receive under non-cancellable data center operating leases for which we are the lessor, excluding month to month leases, for the next five years are as follows:
YEAR |  | FUTURE MINIMUM LEASE PAYMENTS
2021 |  | $ | 225,554 |
2022 |  | 183,027 |
2023 |  | 142,787 |
2024 |  | 111,106 |
2025 |  | 77,308 |
Schedule of stock-based compensation expense | Stock-based compensation expense for Employee Stock-Based Awards included in the accompanying Consolidated Statements of Operations for the years ended December 31, 2020, 2019 and 2018 is as follows:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Stock-based compensation expense | $ | 37,674 |  |  | $ | 35,654 |  |  | $ | 31,167 |
Stock-based compensation expense, after tax | 36,584 |  |  | 33,103 |  |  | 28,998 |
Schedule of weighted average assumptions | These values were estimated on the date of grant using the Black-Scholes option pricing model. The weighted average assumptions used for grants in the years ended December 31, 2020, 2019 and 2018 are as follows:
|  | YEAR ENDED DECEMBER 31,
WEIGHTED AVERAGE ASSUMPTIONS |  | 2020 |  | 2019 |  | 2018
Expected volatility(1) |  | 25.4 | % |  | 24.3 | % |  | 25.4 | %
Risk-free interest rate(2) |  | 1.45 | % |  | 2.47 | % |  | 2.65 | %
Expected dividend yield(3) |  | 7 | % |  | 7 | % |  | 7 | %
Expected life(4) |  | 10.0 years |  | 5.0 years |  | 5.0 years
(1)Expected volatility is calculated utilizing daily historical volatility over a period that equates to the expected life of the option. (2)Risk-free interest rate is based on the United States Treasury interest rates whose term is consistent with the expected life (estimated period of time outstanding) of the stock options. (3)Expected dividend yield is considered in the option pricing model and represents our current annualized expected per share dividends over the current trade price of our common stock. (4)Expected life of the stock options granted is estimated using the historical exercise behavior of employees.
Summary of stock option activity | A summary of stock option activity for the year ended December 31, 2020 is as follows:
| OPTIONS |  | WEIGHTED AVERAGE EXERCISE PRICE |  | WEIGHTED AVERAGE REMAINING CONTRACTUAL TERM (YEARS) |  | AGGREGATE INTRINSIC VALUE
Outstanding at December 31, 2019 | 4,835,721 |  |  | $ | 35.64 |  |  |  |  |
Granted | 589,993 |  |  | 33.32 |  |  |  |  |
Exercised | (204,540) |  |  | 24.38 |  |  |  |  |
Forfeited | (151,230) |  |  | 35.36 |  |  |  |  |
Expired | (337,425) |  |  | 35.82 |  |  |  |  |
Outstanding at December 31, 2020 | 4,732,519 |  |  | $ | 35.83 |  |  | 6.27 |  | $ | 469 |
Options exercisable at December 31, 2020 | 3,439,748 |  |  | $ | 36.40 |  |  | 5.46 |  | $ | 469 |
Options expected to vest | 1,266,640 |  |  | $ | 34.28 |  |  | 8.41 |  | $ | — |
Summary of restricted stock and RSU activity | The fair value of RSUs vested during the years ended December 31, 2020, 2019 and 2018, are as follows:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Fair value of RSUs vested | $ | 26,492 |  |  | $ | 21,191 |  |  | $ | 20,454 |
A summary of RSU activity for the year ended December 31, 2020 is as follows:
| RSUs |  | WEIGHTED-AVERAGE GRANT-DATE FAIR VALUE
Non-vested at December 31, 2019 | 1,203,599 |  |  | $ | 34.71 |
Granted | 1,078,124 |  |  | 31.68 |
Vested | (792,083) |  |  | 33.45 |
Forfeited | (195,634) |  |  | 34.28 |
Non-vested at December 31, 2020 | 1,294,006 |  |  | $ | 33.02 |
Schedule of performance stock units and PU activity | The fair value of earned PUs that vested during the years ended December 31, 2020, 2019 and 2018, is as follows:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Fair value of earned PUs that vested | $ | 11,812 |  |  | $ | 6,503 |  |  | $ | 3,117 |
Summary of performance unit (PU) activity | A summary of PU activity for the year ended December 31, 2020 is as follows:
| ORIGINAL PU AWARDS |  | PU ADJUSTMENT(1) |  | TOTAL PU AWARDS |  | WEIGHTED-AVERAGE GRANT-DATE FAIR VALUE
Non-vested at December 31, 2019 | 1,113,691 |  |  | (314,798) |  |  | 798,893 |  |  | $ | 36.56 |
Granted | 425,777 |  |  | — |  |  | 425,777 |  |  | 34.85 |
Vested | (316,730) |  |  | — |  |  | (316,730) |  |  | 37.29 |
Forfeited/Performance or Market Conditions Not Achieved | (149,529) |  |  | (4,710) |  |  | (154,239) |  |  | 28.28 |
Non-vested at December 31, 2020 | 1,073,209 |  |  | (319,508) |  |  | 753,701 |  |  | $ | 36.98 |
(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.
Other expense (income), net | Consolidated other expense (income), net for the years ended December 31, 2020, 2019 and 2018 consists of the following:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Foreign currency transaction losses (gains), net(1) | $ | 29,830 |  |  | $ | 24,852 |  |  | $ | (15,567) |
Debt extinguishment expense | 68,300 |  |  | — |  |  | — |
Other, net(2) | 45,415 |  |  | 9,046 |  |  | 3,875 |
Other Expense (Income), Net | $ | 143,545 |  |  | $ | 33,898 |  |  | $ | (11,692) |
(1)The gain or loss on foreign currency transactions, calculated as the difference between the historical exchange rate and the exchange rate at the applicable measurement date, includes gains or losses primarily related to (i) borrowings in certain foreign currencies under our Revolving Credit Facility (as defined in Note 6), (ii) our previously outstanding Euro Notes (as defined in Note 6), (iii) certain foreign currency denominated intercompany obligations of our foreign subsidiaries to us and between our foreign subsidiaries, which are not considered permanently invested and (iv) amounts that are paid or received on the net settlement amount from forward contracts (as more fully discussed in Note 5). (2)Other, net for the year ended December 31, 2020 consists primarily of changes in the estimated value of our mandatorily redeemable noncontrolling interests as well as losses on our equity method investments.
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 years ended December 31, 2020, 2019 and 2018 is as follows:
| YEAR ENDED DECEMBER 31,
| 2020 |  | 2019 |  | 2018
Income (loss) from continuing operations | $ | 343,096 |  |  | $ | 268,211 |  |  | $ | 367,558 |
Less: Net income (loss) attributable to noncontrolling interests | 403 |  |  | 938 |  |  | 1,198 |
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) | 342,693 |  |  | 267,273 |  |  | 366,360 |
Income (loss) from discontinued operations, net of tax | — |  |  | 104 |  |  | (12,427) |
Net income (loss) attributable to Iron Mountain Incorporated | $ | 342,693 |  |  | $ | 267,377 |  |  | $ | 353,933 |
Weighted-average shares—basic | 288,183,000 |  |  | 286,971,000 |  |  | 285,913,000 |
Effect of dilutive potential stock options | 24,903 |  |  | 145,509 |  |  | 234,558 |
Effect of dilutive potential RSUs and PUs | 435,287 |  |  | 570,435 |  |  | 505,030 |
Weighted-average shares—diluted | 288,643,190 |  |  | 287,686,944 |  |  | 286,652,588 |
Earnings (losses) per share—basic: |  |  |  |  |
Income (loss) from continuing operations | $ | 1.19 |  |  | $ | 0.93 |  |  | $ | 1.28 |
(Loss) income from discontinued operations, net of tax | — |  |  | — |  |  | (0.04) |
Net income (loss) attributable to Iron Mountain Incorporated(1) | $ | 1.19 |  |  | $ | 0.93 |  |  | $ | 1.24 |
Earnings (losses) per share—diluted: |  |  |  |  |
Income (loss) from continuing operations | $ | 1.19 |  |  | $ | 0.93 |  |  | $ | 1.28 |
(Loss) income from discontinued operations, net of tax | — |  |  | — |  |  | (0.04) |
Net income (loss) attributable to Iron Mountain Incorporated(1) | $ | 1.19 |  |  | $ | 0.93 |  |  | $ | 1.23 |
Antidilutive stock options, RSUs and PUs, excluded from the calculation | 5,663,981 |  |  | 4,475,745 |  |  | 3,258,078 |
(1)Columns may not foot due to rounding.
Components of amortizable intangible assets | The gross carrying amount and accumulated amortization of our finite-lived intangible assets as of December 31, 2020 and 2019, respectively, are as follows:
| DECEMBER 31, 2020 |  | DECEMBER 31, 2019
DESCRIPTION | GROSS CARRYING AMOUNT | ACCUMULATED AMORTIZATION | NET CARRYING AMOUNT |  | GROSS CARRYING AMOUNT | ACCUMULATED AMORTIZATION | NET CARRYING AMOUNT
Assets: |  |  |  |  |  |  |
Customer relationship intangible assets(1) | $ | 1,852,700 |  | $ | (668,547) |  | $ | 1,184,153 |  |  | $ | 1,751,848 |  | $ | (544,721) |  | $ | 1,207,127 |
Customer inducements(1) | 49,098 |  | (26,923) |  | 22,175 |  |  | 52,718 |  | (29,397) |  | 23,321 |
Data center lease-based intangible assets(1)(2) | 269,988 |  | (149,339) |  | 120,649 |  |  | 265,945 |  | (103,210) |  | 162,735 |
Third-party commissions asset(3) | 34,317 |  | (8,761) |  | 25,556 |  |  | 31,708 |  | (4,134) |  | 27,574 |
Liabilities: |  |  |  |  |  |  |
Data center below-market leases(4) | $ | 12,854 |  | $ | (5,943) |  | $ | 6,911 |  |  | $ | 12,750 |  | $ | (3,937) |  | $ | 8,813 |
(1)Included in Customer relationships, customer inducements and data center lease-based intangibles in the accompanying Consolidated Balance Sheets as of December 31, 2020 and 2019. (2)Data center lease-based intangible assets includes Data Center In-Place Leases, Data Center Tenant Relationships and Data Center Above-Market Leases. (3)Included in Other (within Other Assets, Net) in the accompanying Consolidated Balance Sheets as of December 31, 2020 and 2019. (4)Included in Other long-term liabilities in the accompanying Consolidated Balance Sheets as of December 31, 2020 and 2019.
Schedule of derivative instruments | (Liabilities) assets recognized in our Consolidated Balance Sheets as of December 31, 2020 and 2019 by derivative instrument are as follows:
DERIVATIVE INSTRUMENT(1) |  | DECEMBER 31, 2020 |  | DECEMBER 31, 2019
Cash Flow Hedges(2) |  |  |  |
Interest Rate Swap Agreements |  | $ | (21,062) |  |  | $ | (8,774) |
Net Investment Hedges(3) |  |  |  |
August 2023 Cross Currency Swap Agreements |  | (8,229) |  |  | (982) |
February 2026 Cross Currency Swap Agreements |  | (20,412) |  |  | — |
(1)Our derivative assets are included as a component of Other within Other assets, net and our derivative liabilities are included as a component of Other long-term liabilities in our Consolidated Balance Sheets. (2)As of December 31, 2020, cumulative net losses of $21,062 are recorded within Accumulated other comprehensive items, net associated with these interest rate swap agreements. (3)As of December 31, 2020, cumulative net losses of $28,641 are recorded within Accumulated other comprehensive items, net associated with these cross currency swap agreements.

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