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Summary of Significant Accounting Policies (Tables) | 12 Months Ended
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Dec. 31, 2021
Accounting Policies [Abstract] |
Activity in Real Estate Facilities | Activity in real estate facilities during the years ended December 31, 2021 and 2020 is as follows:
| 2021 |  | 2020
| (In thousands)
Operating facilities, at cost: |  |  |
Beginning balance | $ | 5,706,760 |  |  | $ | 3,729,589 |
Capital expenditures | 304,886 |  |  | 346,027 |
Acquisitions | 383,600 |  |  | 1,662,650 |
Purchase price allocation adjustments | (198,541) |  |  | — |
Disposition | (3,691) |  |  | (62,225) |
Impairment | (1,700) |  |  | (2,153) |
Conversion of leased assets to owned | — |  |  | 7,956 |
Impact of foreign exchange rate changes | (56,612) |  |  | 24,916 |
Ending balance | 6,134,702 |  |  | 5,706,760 |
Accumulated depreciation: |  |  |
Beginning balance | (1,080,922) |  |  | (936,422) |
Depreciation expense | (201,497) |  |  | (146,237) |
Dispositions | 1,259 |  |  | 8,731 |
Impact of foreign exchange rate changes | 3,986 |  |  | (6,994) |
Ending balance | (1,277,174) |  |  | (1,080,922) |
Total real estate facilities | $ | 4,857,528 |  |  | $ | 4,625,838 |
Non-real estate assets | 372,101 |  |  | 269,668 |
Total property, buildings and equipment and finance leases, net | $ | 5,229,629 |  |  | $ | 4,895,506 |
Summary of Activity of Allowance for Doubtful Accounts | The following table provides a summary of activity of the allowance for doubtful accounts (in thousands):
| Balance at beginning of year |  | Charged to expense/against revenue |  | Amounts written off, net of recoveries |  | Balance at end of year
Year ended December 31, 2019 | $ | 5,706 |  |  | 3,608 |  |  | (2,387) |  |  | $ | 6,927 |
Year ended December 31, 2020 | $ | 6,927 |  |  | 7,161 |  |  | (1,802) |  |  | $ | 12,286 |
Year ended December 31, 2021 | $ | 12,286 |  |  | 7,186 |  |  | (717) |  |  | $ | 18,755 |

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