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Summary of Significant Accounting Policies - Schedule of Components of Finite-Lived Intangible Assets (Details) - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018
--- | --- | ---
Assets: |  |
Net Carrying Amount | $ 1,415,287 | $ 1,506,522
Customer relationship intangible assets |  |
Assets: |  |
Gross Carrying Amount | 1,747,535 | 1,718,919
Accumulated Amortization | (529,164) | (455,705)
Net Carrying Amount | 1,218,371 | 1,263,214
Customer inducements |  |
Assets: |  |
Gross Carrying Amount | 53,097 | 56,478
Accumulated Amortization | (30,298) | (34,181)
Net Carrying Amount | 22,799 | 22,297
Data center lease-based intangible assets |  |
Assets: |  |
Gross Carrying Amount | 264,382 | 271,818
Accumulated Amortization | (90,265) | (50,807)
Net Carrying Amount | 174,117 | 221,011
Liabilities: |  |
Gross Carrying Amount | 12,720 | 12,318
Accumulated Amortization | (3,424) | (1,642)
Net Carrying Amount | 9,296 | 10,676
Third-party commissions asset |  |
Assets: |  |
Gross Carrying Amount | 31,708 | 30,071
Accumulated Amortization | (3,001) | (1,089)
Net Carrying Amount | 28,707 | 28,982
Customer relationships, customer inducements and data center |  |
Assets: |  |
Gross Carrying Amount | 2,096,722 | 2,077,286
Accumulated Amortization | (652,728) | (541,782)
Net Carrying Amount | $ 1,443,994 | $ 1,535,504

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