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Summary of Significant Accounting Policies - Customer Relationships and Acquisition Costs and Other Intangible Assets (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Amortizable intangible assets |  |  |
NET CARRYING AMOUNT | $ 1,181,043 | $ 1,326,977 |
Amortization | 215,350 | 204,507 | $ 201,878
Included in Depreciation and Amortization |  |  |
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years |  |  |
2022 | 134,107 |  |
2023 | 128,681 |  |
2024 | 123,412 |  |
2025 | 117,306 |  |
2026 | 115,966 |  |
Thereafter | 557,040 |  |
Customer relationship intangible assets |  |  |
Amortizable intangible assets |  |  |
GROSS CARRYING AMOUNT | 1,835,949 | 1,852,700 |
ACCUMULATED AMORTIZATION | (763,943) | (668,547) |
NET CARRYING AMOUNT | $ 1,072,006 | 1,184,153 |
Customer relationship intangible assets | Minimum |  |  |
Amortizable intangible assets |  |  |
Useful life of finite-lived intangible assets | 10 years |  |
Customer relationship intangible assets | Maximum |  |  |
Amortizable intangible assets |  |  |
Useful life of finite-lived intangible assets | 30 years |  |
Customer Inducements |  |  |
Amortizable intangible assets |  |  |
GROSS CARRYING AMOUNT | $ 51,403 | 49,098 |
ACCUMULATED AMORTIZATION | (28,400) | (26,923) |
NET CARRYING AMOUNT | $ 23,003 | 22,175 |
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Minimum |  |  |
Amortizable intangible assets |  |  |
Useful life of finite-lived intangible assets | 1 year |  |
Customer Inducements, Current Record Management Vendor Or Payments To Customers | Maximum |  |  |
Amortizable intangible assets |  |  |
Useful life of finite-lived intangible assets | 10 years |  |
Customer relationship intangible assets |  |  |
Amortizable intangible assets |  |  |
Amortization | $ 117,761 | 117,514 | 117,972
Data center in-place leases and tenant relationships |  |  |
Amortizable intangible assets |  |  |
Amortization | 42,333 | 42,637 | 46,696
Data center lease-based intangible assets |  |  |
Amortizable intangible assets |  |  |
GROSS CARRYING AMOUNT | 278,904 | 269,988 |
ACCUMULATED AMORTIZATION | (192,870) | (149,339) |
NET CARRYING AMOUNT | 86,034 | 120,649 |
GROSS CARRYING AMOUNT | 12,782 | 12,854 |
ACCUMULATED AMORTIZATION | (6,923) | (5,943) |
NET CARRYING AMOUNT | 5,859 | 6,911 |
Third-party commissions asset and other finite-lived intangible assets |  |  |
Amortizable intangible assets |  |  |
GROSS CARRYING AMOUNT | 33,947 | 34,317 |
ACCUMULATED AMORTIZATION | (13,716) | (8,761) |
NET CARRYING AMOUNT | 20,231 | 25,556 |
Amortization | 6,987 | 7,004 | 7,957
Customer inducements and data center above-market and below-market leases |  |  |
Amortizable intangible assets |  |  |
Amortization | 8,852 | $ 9,878 | $ 13,703
Customer inducements and data center above-market and below-market leases | Amortization Expense Charged To Revenues |  |  |
Estimated amortization expense for existing intangible assets for the next five succeeding fiscal years |  |  |
2022 | 6,367 |  |
2023 | 4,628 |  |
2024 | 2,599 |  |
2025 | 1,506 |  |
2026 | 1,187 |  |
Thereafter | $ 2,616 |  |

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