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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2019
Accounting Policies [Abstract] |
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):
| 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,
| 2019 |  | 2018
Land | $ | 448,566 |  |  | $ | 400,980 |
Buildings and building improvements | 3,029,309 |  |  | 2,991,307 |
Leasehold improvements | 852,022 |  |  | 770,666 |
Racking | 2,040,832 |  |  | 2,001,831 |
Warehouse equipment/vehicles | 483,218 |  |  | 481,515 |
Furniture and fixtures | 54,275 |  |  | 56,207 |
Computer hardware and software | 689,261 |  |  | 680,283 |
Construction in progress | 451,423 |  |  | 218,160 |
| $ | 8,048,906 |  |  | $ | 7,600,949 |
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:
| Carrying Value as of December 31, 2019
North America RIM(1) | $ | 2,715,550 |
Europe RIM(1) | 572,482 |
Latin America RIM(1) | 140,897 |
ANZ RIM(1) | 274,913 |
Asia RIM(1) | 239,059 |
Global Data Center(2) | 424,568 |
Fine Arts(3) | 37,533 |
Entertainment Services(3) | 34,102 |
Technology Escrow Services(3) | 46,105 |
Total | $ | 4,485,209 |
______________________________________________________________________ (1) This reporting unit is included in our Global RIM (as defined in Note 9) Business segment. (2) This reporting unit comprises our Global Data Center Business segment. (3) This reporting unit is included in our Corporate and Other Business segment.
Schedule of changes in the carrying value of goodwill attributable to each reportable operating segment | The carrying value of goodwill, net for each of our reporting units described above as of December 31, 2018 is as follows:
| Carrying Value as of December 31, 2018
North American Records and Information Management(1) | $ | 2,251,795 |
North American Data Management(2) | 493,491 |
Consumer Storage(3) | — |
Fine Arts(3) | 35,526 |
Entertainment Services(3) | 34,233 |
Western Europe(4) | 381,806 |
NEE and MEI(5) | 169,780 |
Latin America(5) | 136,099 |
ANZ SA(5) | 300,204 |
Asia(5) | 212,140 |
Global Data Center(6) | 425,956 |
Total | $ | 4,441,030 |
_______________________________________________________________________________ (1) This reporting unit comprised our former North American Records and Information Management Business segment. (2) This reporting unit comprised our former North American Data Management Business segment. (3) This reporting unit was included in our Corporate and Other Business segment. (4) This reporting unit comprised our former Western European Business segment. (5) This reporting unit was included in our former Other International Business segment. (6) This reporting unit comprised our Global Data Center Business segment. The changes in the carrying value of goodwill attributable to each reportable operating segment for the years ended December 31, 2019 and 2018 is 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, 2017 | $ | 3,964,114 |  |  | $ | — |  |  | $ | 106,153 |  |  | $ | 4,070,267 |
Deductible goodwill acquired during the year | 3,251 |  |  | — |  |  | 6,644 |  |  | 9,895 |
Non-deductible goodwill acquired during the year | 34,230 |  |  | 429,853 |  |  | 3,620 |  |  | 467,703 |
Goodwill allocated to IMFS Divestment (see Note 13) | (1,202 | ) |  | — |  |  | — |  |  | (1,202 | )
Fair value and other adjustments(1) | 3,860 |  |  | — |  |  | 609 |  |  | 4,469 |
Currency effects | (105,043 | ) |  | (3,897 | ) |  | (1,162 | ) |  | (110,102 | )
Goodwill balance, net of accumulated amortization, as of December 31, 2018 | 3,899,210 |  |  | 425,956 |  |  | 115,864 |  |  | 4,441,030 |
Deductible goodwill acquired during the year | 16,450 |  |  | — |  |  | — |  |  | 16,450 |
Non-deductible goodwill acquired during the year | 11,228 |  |  | — |  |  | 1,904 |  |  | 13,132 |
Fair value and other adjustments(2) | 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 |
Accumulated Goodwill Impairment Balance as of December 31, 2018 | $ | 132,409 |  |  | $ | — |  |  | $ | 3,011 |  |  | $ | 135,420 |
Accumulated Goodwill Impairment Balance as of December 31, 2019 | $ | 132,409 |  |  | $ | — |  |  | $ | 3,011 |  |  | $ | 135,420 |
___________________________________________________________________
(1) | Total fair value and other adjustments primarily include net adjustments of $(2,717) primarily related to property, plant and equipment, customer relationship intangible assets and other liabilities and $7,186 of cash paid related to certain acquisitions completed in 2017.
(2) Total fair value and other adjustments primarily include net adjustments of $4,942 primarily related to property, plant and equipment, customer relationship and data center lease-based intangible assets and deferred income taxes and other liabilities offset by $662 of net cash received related to certain acquisitions completed in 2018.
Components of amortizable intangible assets | The gross carrying amount and accumulated amortization of our finite-lived intangible assets as of December 31, 2019 and 2018, respectively, are as follows:
| December 31, 2019 |  | December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Assets: |  |  |  |  |  |  |  |  |  |  |
Customer relationship intangible assets | $ | 1,751,848 |  |  | $ | (544,721 | ) |  | $ | 1,207,127 |  |  | $ | 1,718,919 |  |  | $ | (455,705 | ) |  | $ | 1,263,214 |
Customer inducements | 52,718 |  |  | (29,397 | ) |  | 23,321 |  |  | 56,478 |  |  | (34,181 | ) |  | 22,297 |
Data center lease-based intangible assets(1) | 265,945 |  |  | (103,210 | ) |  | 162,735 |  |  | 271,818 |  |  | (50,807 | ) |  | 221,011 |
Third-party commissions asset(2) | 31,708 |  |  | (4,134 | ) |  | 27,574 |  |  | 30,071 |  |  | (1,089 | ) |  | 28,982 |
| $ | 2,102,219 |  |  | $ | (681,462 | ) |  | $ | 1,420,757 |  |  | $ | 2,077,286 |  |  | $ | (541,782 | ) |  | $ | 1,535,504 |
Liabilities: |  |  |  |  |  |  |  |  |  |  |
Data center below-market leases | $ | 12,750 |  |  | $ | (3,937 | ) |  | $ | 8,813 |  |  | $ | 12,318 |  |  | $ | (1,642 | ) |  | $ | 10,676 |
_______________________________________________________________________________
(1) | Includes Data Center In-Place Leases, Data Center Tenant Relationships and Data Center Above-Market Leases.
(2) Third-party commissions asset is included in Other, a component of Other assets, net in the accompanying Consolidated Balance Sheets as of December 31, 2019 and 2018. See Note 6 for additional information on the third-party commissions asset.
| December 31, 2019 |  | December 31, 2018
| Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount |  | Gross Carrying Amount |  | Accumulated Amortization |  | Net Carrying Amount
Other finite-lived intangible assets (included in Other, a component of Other assets, net) | $ | 19,893 |  |  | $ | (18,405 | ) |  | $ | 1,488 |  |  | $ | 20,310 |  |  | $ | (14,798 | ) |  | $ | 5,512 |
Schedule of amortization expenses | Amortization expense associated with finite-lived intangible assets, revenue reduction associated with the amortization of Permanent Withdrawal Fees and net revenue reduction associated with the amortization of Data Center Above-Market Leases and Data Center Below-Market Leases for the years ended December 31, 2019, 2018 and 2017 are as follows:
|  | Year Ended December 31,
|  | 2019 |  | 2018 |  | 2017
Amortization expense included in depreciation and amortization associated with: |  |  |  |  |  |  |  |  |
Customer relationship and customer inducement intangible assets |  | $ | 117,972 |  |  | $ | 113,782 |  |  | $ | 109,563 |
Data center in-place leases and tenant relationships |  | 46,696 |  |  | 43,061 |  |  | — |
Third-party commissions asset and other finite-lived intangible assets |  | 7,957 |  |  | 5,713 |  |  | 6,530 |
Revenue reduction associated with amortization of: |  |  |  |  |  |  |  |  |
Permanent withdrawal fees |  | $ | 9,993 |  |  | $ | 11,408 |  |  | $ | 11,253 |
Data center above-market leases and data center below-market leases |  | 3,710 |  |  | 4,873 |  |  | — |
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years | Estimated amortization expense for existing finite-lived intangible assets (excluding deferred financing costs, as disclosed in Note 2.j. and Contract Fulfillment Costs, as defined and disclosed in Note 2.l.) is as follows:
| Estimated Amortization
| Included in Depreciation and Amortization |  | Revenue Reduction Associated with the Amortization of Permanent Withdrawal Fees |  | Revenue Reduction (Increase) Associated with Amortization of Data Center Above-market leases and Below-market leases
2020 | $ | 160,865 |  |  | $ | 7,760 |  |  | $ | 872 |
2021 | 157,647 |  |  | 5,207 |  |  | 234 |
2022 | 127,148 |  |  | 3,200 |  |  | 273 |
2023 | 121,256 |  |  | 2,112 |  |  | (470 | )
2024 | 116,253 |  |  | 1,125 |  |  | (610 | )
Thereafter | 712,369 |  |  | 1,303 |  |  | (3,112 | )
Schedule of amortization of deferred financing costs | Estimated amortization expense for deferred financing costs, which are amortized as a component of interest expense, is as follows:
| Estimated Amortization of Deferred Financing Costs
2020 | $ | 17,132 |
2021 | 16,002 |
2022 | 14,888 |
2023 | 11,618 |
2024 | 8,424 |
Thereafter | 18,901 |
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,
| 2019 |  | 2018
Interest | $ | 97,987 |  |  | $ | 84,283 |
Incentive compensation | 56,662 |  |  | 75,256 |
Sales tax and VAT payable | 115,352 |  |  | 124,232 |
Dividend | 186,021 |  |  | 181,986 |
Operating lease liabilities | 223,249 |  |  | — |
Other | 282,481 |  |  | 315,024 |
Accrued expenses | $ | 961,752 |  |  | $ | 780,781 |
Schedule of amortization expense associated with commissions asset and Intake Costs | The Contract Fulfillment Costs as of December 31, 2019 and 2018 are as follows:
|  |  |  | December 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) |  | $ | 41,224 |  |  | $ | (23,579 | ) |  | $ | 17,645 |  |  | $ | 39,748 |  |  | $ | (24,504 | ) |  | $ | 15,244 |
Commissions asset |  | Other (within Other Assets, Net) |  | 68,008 |  |  | (27,178 | ) |  | 40,830 |  |  | 58,424 |  |  | (34,637 | ) |  | 23,787 |
Amortization expense associated with the Intake Costs asset and capitalized commissions asset for the years ended December 31, 2019 and 2018 are as follows:
|  | Year Ended December 31,
Description |  | 2019 |  | 2018
Intake Costs asset |  | $ | 10,144 |  |  | $ | 10,380 |
Capitalized commissions asset |  | 19,109 |  |  | 13,838 |
Contract with customer, future amortization expense | Estimated amortization expense for Contract Fulfillment Costs is as follows:
Year |  | Estimated Amortization
2020 |  | $ | 28,156 |
2021 |  | 20,448 |
2022 |  | 9,871 |
Schedule of deferred revenue liabilities | Deferred revenue liabilities are reflected as follows in our Consolidated Balance Sheets:
|  |  |  | December 31,
Description |  | Location in Balance Sheet |  | 2019 |  | 2018
Deferred revenue - Current |  | Deferred revenue |  | $ | 274,036 |  |  | $ | 264,823 |
Deferred revenue - Long-term |  | Other Long-term Liabilities |  | 36,029 |  |  | 26,401 |
Schedule of future minimum rental payments for operating leases | 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
2020 |  | $ | 202,130 |
2021 |  | 135,911 |
2022 |  | 98,797 |
2023 |  | 80,079 |
2024 |  | 68,376 |
The estimated minimum future lease payments as of December 31, 2019, are as follows:
Year |  | Operating Leases(1) |  | Sublease Income |  | Financing Leases(1)
2020 |  | $ | 339,469 |  |  | $ | (7,695 | ) |  | $ | 62,271 |
2021 |  | 319,628 |  |  | (5,282 | ) |  | 54,993 |
2022 |  | 295,981 |  |  | (4,996 | ) |  | 44,886 |
2023 |  | 267,809 |  |  | (4,885 | ) |  | 39,130 |
2024 |  | 237,604 |  |  | (3,543 | ) |  | 31,849 |
Thereafter |  | 1,454,918 |  |  | (7,691 | ) |  | 277,890 |
Total minimum lease payments |  | 2,915,409 |  |  | $ | (34,092 | ) |  | 511,019 |
Less amounts representing interest or imputed interest |  | (963,474 | ) |  |  |  |  | (143,837 | )
Present value of lease obligations |  | $ | 1,951,935 |  |  |  |  |  | $ | 367,182 |
The estimated minimum future lease payments as of December 31, 2018 are as follows:
Year |  | Operating Leases(1) |  | Sublease Income |  | Financing 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 lease obligations |  |  |  |  |  |  | $ | 447,173 |
_______________________________________________________________________________
(1) | Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2019 and December 31, 2018 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 financing lease and financing obligations associated with build to suit lease transactions at December 31, 2018.
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, 2019 and January 1, 2019 (date of adoption of ASU 2016-02) are as follows:
Description |  | Location in Balance Sheet |  | December 31, 2019 |  | January 1, 2019 (Date of Adoption of ASU 2016-02)
Assets: |  |  |  |  |  |
Operating lease right-of-use assets(1) |  | Operating lease right-of-use assets |  | $ | 1,869,101 |  |  | $ | 1,825,721 |
Financing lease right-of-use assets, net of accumulated depreciation(2) |  | Property, Plant and Equipment, Net |  | 327,215 |  |  | 361,078 |
Total |  |  |  | $ | 2,196,316 |  |  | $ | 2,186,799 |
Liabilities: |  |  |  |  |  |
Current |  |  |  |  |  |
Operating lease liabilities |  | Accrued expenses and other current liabilities |  | $ | 223,249 |  |  | $ | 209,911 |
Financing lease liabilities |  | Current portion of long-term debt |  | 46,582 |  |  | 50,437 |
Total current lease liabilities |  |  |  | 269,831 |  |  | 260,348 |
Long-term |  |  |  |  |  |
Operating lease liabilities |  | Long-term Operating Lease Liabilities, net of current portion |  | 1,728,686 |  |  | 1,685,771 |
Financing lease liabilities |  | Long-term Debt, net of current portion |  | 320,600 |  |  | 350,263 |
Total long-term lease liabilities |  |  |  | 2,049,286 |  |  | 2,036,034 |
Total |  |  |  | $ | 2,319,117 |  |  | $ | 2,296,382 |
______________________________________________________________ (1) At December 31, 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, 2019, these assets are comprised of approximately 69% real estate related assets and 31% non-real estate related assets.
Schedule of lease, cost | Supplemental cash flow information relating to our leases for the year ended December 31, 2019 is as follows:
Cash paid for amounts included in measurement of lease liabilities: |  | Year Ended December 31, 2019
Operating cash flows used in operating leases |  | $ | 338,059 |
Operating cash flows used in financing leases (interest) |  | 21,031 |
Financing cash flows used in financing leases |  | 58,033 |
Non-cash items: |  |
Operating lease modifications and reassessments |  | $ | 108,023 |
New operating leases (including acquisitions) |  | 170,464 |
New financing leases, modifications and reassessments |  | 32,742 |
Weighted average remaining lease terms and discount rates as of December 31, 2019 are as follows:
|  | Remaining Lease Term
Operating leases |  | 11.0 Years |
Financing leases |  | 11.6 Years |
|  | Discount Rate
Operating leases |  | 7.1 | %
Financing leases |  | 5.7 | %
The components of the lease expense for the year ended December 31, 2019 are as follows:
Description |  | Location in Statement of Operations |  | December 31, 2019
Operating lease cost(1) |  | Cost of sales and Selling, general and administrative |  | $ | 459,619 |
Financing lease cost: |  |  |  |
Depreciation of financing lease right-of-use assets |  | Depreciation and amortization |  | $ | 59,258 |
Interest expense for financing lease liabilities |  | Interest Expense, Net |  | 21,031 |
Total financing lease cost |  |  |  | $ | 80,289 |
______________________________________________________________ (1) Of the $459,619 incurred for the year ended December 31, 2019, $447,194 is included within Cost of sales and $12,425 is included within Selling, general and administrative expenses. Operating lease cost includes variable lease costs of $105,922 for the year ended December 31, 2019.
Schedule of future minimum lease payments for capital leases | The estimated minimum future lease payments as of December 31, 2019, are as follows:
Year |  | Operating Leases(1) |  | Sublease Income |  | Financing Leases(1)
2020 |  | $ | 339,469 |  |  | $ | (7,695 | ) |  | $ | 62,271 |
2021 |  | 319,628 |  |  | (5,282 | ) |  | 54,993 |
2022 |  | 295,981 |  |  | (4,996 | ) |  | 44,886 |
2023 |  | 267,809 |  |  | (4,885 | ) |  | 39,130 |
2024 |  | 237,604 |  |  | (3,543 | ) |  | 31,849 |
Thereafter |  | 1,454,918 |  |  | (7,691 | ) |  | 277,890 |
Total minimum lease payments |  | 2,915,409 |  |  | $ | (34,092 | ) |  | 511,019 |
Less amounts representing interest or imputed interest |  | (963,474 | ) |  |  |  |  | (143,837 | )
Present value of lease obligations |  | $ | 1,951,935 |  |  |  |  |  | $ | 367,182 |
The estimated minimum future lease payments as of December 31, 2018 are as follows:
Year |  | Operating Leases(1) |  | Sublease Income |  | Financing 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 lease obligations |  |  |  |  |  |  | $ | 447,173 |
_______________________________________________________________________________
(1) | Estimated minimum future lease payments exclude variable common area maintenance charges, insurance and taxes. Differences in estimated lease payments between December 31, 2019 and December 31, 2018 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 financing lease and financing obligations associated with build to suit lease transactions at December 31, 2018.
Schedule of weighted average assumptions | The weighted average assumptions used for grants in the year ended December 31:
Weighted Average Assumptions |  | 2019 |  | 2018 |  | 2017
Expected volatility |  | 24.3 | % |  | 25.4 | % |  | 25.7 | %
Risk-free interest rate |  | 2.47 | % |  | 2.65 | % |  | 1.96 | %
Expected dividend yield |  | 7 | % |  | 7 | % |  | 6 | %
Expected life |  | 5.0 years |  |  | 5.0 years |  |  | 5.0 years |
Summary of stock option activity | A summary of our stock options outstanding as of December 31, 2019 by vesting terms is as follows:
| December 31, 2019
| Stock Options Outstanding |  | % of Stock Options Outstanding
Three-year vesting period (10 year contractual life) | 4,691,321 |  |  | 97.0 | %
Five-year vesting period (10 year contractual life) | 144,400 |  |  | 3.0 | %
| 4,835,721 |  |  | 100.0 | %
A summary of stock option activity for the year ended December 31, 2019 is as follows:
| Options |  | Weighted Average Exercise Price |  | Weighted Average Remaining Contractual Term (Years) |  | Aggregate Intrinsic Value
Outstanding at December 31, 2018 | 4,271,834 |  |  | $ | 34.78 |  |  |  |  |  |
Granted | 920,706 |  |  | 35.71 |  |  |  |  |  |
Exercised | (303,543 | ) |  | 23.86 |  |  |  |  |  |
Forfeited | (23,984 | ) |  | 35.21 |  |  |  |  |  |
Expired | (29,292 | ) |  | 34.78 |  |  |  |  |  |
Outstanding at December 31, 2019 | 4,835,721 |  |  | $ | 35.64 |  |  | 6.72 |  | $ | 3,005 |
Options exercisable at December 31, 2019 | 3,068,945 |  |  | $ | 35.80 |  |  | 5.81 |  | $ | 3,005 |
Options expected to vest | 1,648,127 |  |  | $ | 35.34 |  |  | 8.47 |  | $ | — |
Aggregate intrinsic value of stock options exercised | The aggregate intrinsic value of stock options exercised for the years ended December 31, 2019, 2018 and 2017 is as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Aggregate intrinsic value of stock options exercised | $ | 3,148 |  |  | $ | 2,181 |  |  | $ | 8,485 |
Summary of restricted stock and RSU activity | Cash dividends accrued and paid on RSUs for the years ended December 31, 2019, 2018 and 2017, are as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Cash dividends accrued on RSUs | $ | 3,215 |  |  | $ | 2,899 |  |  | $ | 2,590 |
Cash dividends paid on RSUs | 2,369 |  |  | 2,477 |  |  | 2,370 |
The fair value of RSUs vested during the years ended December 31, 2019, 2018 and 2017, are as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Fair value of RSUs vested | $ | 21,191 |  |  | $ | 20,454 |  |  | $ | 19,825 |
A summary of RSU activity for the year ended December 31, 2019 is as follows:
| RSUs |  | Weighted- Average Grant-Date Fair Value
Non-vested at December 31, 2018 | 1,196,566 |  |  | $ | 34.33 |
Granted | 823,508 |  |  | 34.72 |
Vested | (678,138 | ) |  | 34.06 |
Forfeited | (138,337 | ) |  | 34.75 |
Non-vested at December 31, 2019 | 1,203,599 |  |  | $ | 34.71 |
Schedule of performance units | Cash dividends accrued and paid on PUs for the years ended December 31, 2019, 2018 and 2017, are as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Cash dividends accrued on PUs | $ | 2,260 |  |  | $ | 1,804 |  |  | $ | 1,290 |
Cash dividends paid on PUs | 1,162 |  |  | 644 |  |  | 205 |
The fair value of earned PUs that vested during the years ended December 31, 2019, 2018 and 2017, is as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Fair value of earned PUs that vested | $ | 6,503 |  |  | $ | 3,117 |  |  | $ | 1,242 |
Summary of performance unit (PU) activity | A summary of PU activity for the year ended December 31, 2019 is as follows:
| Original PU Awards |  | PU Adjustment(1) |  | Total PU Awards |  | Weighted- Average Grant-Date Fair Value
Non-vested at December 31, 2018 | 967,049 |  |  | (299,948 | ) |  | 667,101 |  |  | $ | 36.54 |
Granted | 380,856 |  |  | — |  |  | 380,856 |  |  | 36.07 |
Vested | (206,279 | ) |  | — |  |  | (206,279 | ) |  | 37.97 |
Forfeited/Performance or Market Conditions Not Achieved | (27,935 | ) |  | (14,850 | ) |  | (42,785 | ) |  | 26.50 |
Non-vested at December 31, 2019 | 1,113,691 |  |  | (314,798 | ) |  | 798,893 |  |  | $ | 36.56 |
_______________________________________________________________________________ (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 years ended December 31, 2019, 2018 and 2017 is as follows:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Income (loss) from continuing operations | $ | 268,211 |  |  | $ | 367,558 |  |  | $ | 178,015 |
Less: Net income (loss) attributable to noncontrolling interests | 938 |  |  | 1,198 |  |  | 1,611 |
Income (loss) from continuing operations (utilized in numerator of Earnings Per Share calculation) | 267,273 |  |  | 366,360 |  |  | 176,404 |
Income (loss) from discontinued operations, net of tax | 104 |  |  | (12,427 | ) |  | (6,291 | )
Net income (loss) attributable to Iron Mountain Incorporated | $ | 267,377 |  |  | $ | 353,933 |  |  | $ | 170,113 |
Weighted-average shares—basic | 286,971,000 |  |  | 285,913,000 |  |  | 265,898,000 |
Effect of dilutive potential stock options | 145,509 |  |  | 234,558 |  |  | 431,071 |
Effect of dilutive potential RSUs and PUs | 570,435 |  |  | 505,030 |  |  | 509,235 |
Effect of Over-Allotment Option(1) | — |  |  | — |  |  | 6,278 |
Weighted-average shares—diluted | 287,686,944 |  |  | 286,652,588 |  |  | 266,844,584 |
Earnings (losses) per share—basic: |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 0.93 |  |  | $ | 1.28 |  |  | $ | 0.66 |
(Loss) income from discontinued operations, net of tax | — |  |  | (0.04 | ) |  | (0.02 | )
Net income (loss) attributable to Iron Mountain Incorporated(2) | $ | 0.93 |  |  | $ | 1.24 |  |  | $ | 0.64 |
Earnings (losses) per share—diluted: |  |  |  |  |  |  |  |
Income (loss) from continuing operations | $ | 0.93 |  |  | $ | 1.28 |  |  | $ | 0.66 |
(Loss) income from discontinued operations, net of tax | — |  |  | (0.04 | ) |  | (0.02 | )
Net income (loss) attributable to Iron Mountain Incorporated(2) | $ | 0.93 |  |  | $ | 1.23 |  |  | $ | 0.64 |
Antidilutive stock options, RSUs and PUs, excluded from the calculation | 4,475,745 |  |  | 3,258,078 |  |  | 2,326,344 |
___________________________________________________________________
(1) | See Note 12.
(2) Columns may not foot due to rounding.
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
2019 |  | $ | 43,584 |  |  | $ | 51,846 |  |  | $ | 19,389 |  |  | $ | (71,963 | ) |  | $ | 42,856 |
2018 |  | 46,648 |  |  | 36,329 |  |  | 18,625 |  |  | (58,018 | ) |  | 43,584 |
2017 |  | 44,290 |  |  | 38,966 |  |  | 14,826 |  |  | (51,434 | ) |  | 46,648 |
_______________________________________________________________________________ (1) Primarily consists of the issuance of credit memos, the write-off of accounts receivable and the impact associated with currency translation adjustments.
Assets and liabilities carried at fair value measured on a recurring basis |
|  |  |  | 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 |  |  | — |
|  |  |  | Fair Value Measurements at December 31, 2018 Using
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 |  |  | — |
Derivative Liabilities(4) |  | 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 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, (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 and (iii) short-term (six months or less) foreign exchange currency forward contracts that we have entered into to hedge certain of our foreign exchange intercompany exposures. 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 3 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, 2019, 2018 and 2017 are as follows:
| Foreign Currency Translation Adjustment |  | Change in Fair Value of Derivative Instruments |  | Total
Balance as of December 31, 2016 | $ | (212,573 | ) |  | $ | — |  |  | $ | (212,573 | )
Other comprehensive (loss) income: |  |  |  |  |
Foreign currency translation adjustment(1) | 108,584 |  |  | — |  |  | 108,584 |
Total other comprehensive (loss) income | 108,584 |  |  | — |  |  | 108,584 |
Balance as of December 31, 2017 | (103,989 | ) |  | — |  |  | (103,989 | )
Other comprehensive (loss) income: |  |  |  |  |  |  |
Foreign currency translation adjustment | (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 (loss) income: |  |  |  |  |  |  |
Foreign currency translation adjustment | 11,866 |  |  | — |  |  | 11,866 |
Change in fair value of derivative instruments | — |  |  | (8,783 | ) |  | (8,783 | )
Total other comprehensive (loss) income | 11,866 |  |  | (8,783 | ) |  | 3,083 |
Balance as of December 31, 2019 | $ | (252,825 | ) |  | $ | (9,756 | ) |  | $ | (262,581 | )
______________________________________________________________ (1) During the year ended December 31, 2017, approximately $29,100 of cumulative translation adjustment associated with our businesses in Russia and Ukraine was reclassified from accumulated other comprehensive items, net and was included in the gain on sale associated with the Russia and Ukraine Divestment (see Note 13).
Other expense (income), net | Other expense (income), net for the years ended December 31, 2019, 2018 and 2017 consists of the following:
| Year Ended December 31,
| 2019 |  | 2018 |  | 2017
Foreign currency transaction losses (gains), net(1) | $ | 24,852 |  |  | $ | (15,567 | ) |  | $ | 43,248 |
Debt extinguishment expense, net | — |  |  | — |  |  | 78,368 |
Other, net(2) | 9,046 |  |  | 3,875 |  |  | (42,187 | )
Other Expense (Income), Net | $ | 33,898 |  |  | $ | (11,692 | ) |  | $ | 79,429 |
_______________________________________________________________________________
(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 and our Former Revolving Credit Facility (each as defined in Note 4), (ii) our Euro Notes (as defined in Note 4), (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 3).
(2) Other, net for the year ended December 31, 2017 includes a gain of $38,869 associated with the Russia and Ukraine Divestment (as defined in Note 13).
Schedule of immaterial restatement | The following table sets forth the effect of the (i) change in presentation of Significant Acquisition Costs and (ii) correction in presentation of gain on sale of real estate to certain line items of our Consolidated Statements of Operations for December 31, 2018 and 2017. The effect of these items did not impact Income (Loss) from Continuing Operations or Net Income (Loss).
|  | Year Ended December 31,
|  | 2018 |  | 2017
|  | Significant Acquisition Costs |  | Gain on Sale of Real Estate |  | Total |  | Significant Acquisition Costs |  | Gain on Sale of Real Estate |  | Total
Cost of sales (excluding depreciation and amortization) |  | $ | (7,628 | ) |  | $ | — |  |  | $ | (7,628 | ) |  | $ | (20,493 | ) |  | $ | — |  |  | $ | (20,493 | )
Selling, general and administrative |  | $ | (43,037 | ) |  | $ | — |  |  | $ | (43,037 | ) |  | $ | (64,408 | ) |  | $ | — |  |  | $ | (64,408 | )
Significant Acquisition Costs |  | $ | 50,665 |  |  | $ | — |  |  | $ | 50,665 |  |  | $ | 84,901 |  |  | $ | — |  |  | $ | 84,901 |
(Gain) Loss on disposal/write-down of property, plant and equipment, net |  | $ | — |  |  | $ | (63,804 | ) |  | $ | (63,804 | ) |  | $ | — |  |  | $ | (1,565 | ) |  | $ | (1,565 | )
Total Operating Expenses |  | $ | — |  |  | $ | (63,804 | ) |  | $ | (63,804 | ) |  | $ | — |  |  | $ | (1,565 | ) |  | $ | (1,565 | )
Operating Income (Loss) |  | $ | — |  |  | $ | 63,804 |  |  | $ | 63,804 |  |  | $ | — |  |  | $ | 1,565 |  |  | $ | 1,565 |
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes |  | $ | — |  |  | $ | 63,804 |  |  | $ | 63,804 |  |  | $ | — |  |  | $ | 1,565 |  |  | $ | 1,565 |
Provision (Benefit) for Income Taxes |  | $ | — |  |  | $ | 8,476 |  |  | $ | 8,476 |  |  | $ | — |  |  | $ | — |  |  | $ | — |
Gain on Sale of Real Estate, Net of tax |  | $ | — |  |  | $ | 55,328 |  |  | $ | 55,328 |  |  | $ | — |  |  | $ | 1,565 |  |  | $ | 1,565 |
The following table sets forth the effect of the immaterial restatement to certain line items of our Consolidated Statements of Operations for the years ended December 31, 2018 and 2017:
| Year Ended December 31,
| 2018 |  | 2017
Selling, general and administrative | $ | 11,045 |  |  | $ | 16,623 |
Total Operating Expenses | $ | 11,045 |  |  | $ | 16,623 |
Operating Income (Loss) | $ | (11,045 | ) |  | $ | (16,623 | )
Interest Expense, Net | $ | 359 |  |  | $ | 70 |
Income (Loss) from Continuing Operations Before Provision (Benefit) for Income Taxes | $ | (11,404 | ) |  | $ | (16,693 | )
Provision (Benefit) for Income Taxes | $ | (1,986 | ) |  | $ | (2,985 | )
Income (Loss) from Continuing Operations | $ | (9,418 | ) |  | $ | (13,708 | )
Net Income (Loss) | $ | (9,418 | ) |  | $ | (13,708 | )
Net Income (Loss) Attributable to Iron Mountain Incorporated | $ | (9,418 | ) |  | $ | (13,708 | )
Earnings (Losses) per Share - Basic: |  |  |
Income (Loss) from Continuing Operations | $ | (0.03 | ) |  | $ | (0.05 | )
Net Income (Loss) Attributable to Iron Mountain Incorporated | $ | (0.03 | ) |  | $ | (0.05 | )
Earnings (Losses) per Share - Diluted: |  |  |
Income (Loss) from Continuing Operations | $ | (0.03 | ) |  | $ | (0.05 | )
Net Income (Loss) Attributable to Iron Mountain Incorporated | $ | (0.03 | ) |  | $ | (0.05 | )
The following table sets forth the effect of the immaterial restatement to certain line items of our Consolidated Balance Sheet as of December 31, 2018:
| December 31, 2018
Total Other Assets, Net | $ | 4,971 |
Total Assets | $ | 4,971 |
Accrued expenses and other current liabilities | $ | 28,097 |
Total Current Liabilities | $ | 28,097 |
(Distribution in excess of earnings) Earnings in excess of distributions | $ | (23,126 | )
Total Iron Mountain Incorporated Stockholders' Equity | $ | (23,126 | )

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