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Summary of Significant Accounting Policies - Schedule of Components of Amortizable Intangible Assets (Details) - USD ($) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2018 | Jun. 30, 2017 | Dec. 31, 2017
Amortizable intangible assets |  |  |
Net carrying amount | $ 1,530,549 |  | $ 1,400,547
Revenue reduction associated with amortization of permanent withdrawal fees | 7,925 | $ 5,906 |
Customer Relationships |  |  |
Amortizable intangible assets |  |  |
Finite-Lived Intangible Assets, Gross | 1,690,147 |  | 1,704,105
Accumulated amortization | (436,076) |  | (395,278)
Net carrying amount | $ 1,254,071 |  | 1,308,827
Customer inducements |  |  |
Amortizable intangible assets |  |  |
Finite-Lived Intangible Asset, Useful Life | 3 years |  |
Finite-Lived Intangible Assets, Gross | $ 57,555 |  | 140,030
Accumulated amortization | (35,430) |  | (66,981)
Net carrying amount | 22,125 |  | 73,049
Data Center Business |  |  |
Amortizable intangible assets |  |  |
Finite-Lived Intangible Assets, Gross | 276,936 |  | 19,314
Below Market Lease, Accumulated Amortization | 761 |  | 0
Below Market Lease, Net | 11,577 |  | 0
Accumulated amortization | (22,583) |  | (643)
Net carrying amount | 254,353 |  | 18,671
Below Market Lease, Gross | 12,338 |  | 0
Other finite-lived intangible assets |  |  |
Amortizable intangible assets |  |  |
Finite-Lived Intangible Assets, Gross | 20,365 |  | 20,929
Accumulated amortization | 12,611 |  | 10,728
Net carrying amount | $ 7,754 |  | $ 10,201

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