Significant Accounting Policies Update	9 Months Ended
Significant Accounting Policies Update	Sep. 30, 2019
Accounting Policies [Abstract]
Significant Accounting Policies Update	Significant Accounting Policies Update The Company's significant accounting policies are detailed in Note 2 of its annual report on Form 10-K for the year ended December 31, 2018. However, the following policies have been updated as of January 1, 2019. Property and Equipment Property and equipment are recorded at cost, net of accumulated depreciation and amortization. Property and equipment generally includes purchases of items with a per-unit value greater than $1,000 and a useful life greater than one year. Depreciation and amortization are computed on a straight-line basis over the estimated useful lives of the assets. The Company periodically reviews the estimated useful lives of property and equipment. Changes to the estimated useful lives are recorded prospectively from the date of the change. Upon retirement or sale, the cost of the assets disposed of and the related accumulated depreciation are removed from the accounts and any resulting gain or loss is included in income from operations. The Company has implemented software and hardware initiatives to manage its global network more efficiently and, as a result, the expected average useful life of its network assets, primarily servers, increased from four years to five years, effective January 1, 2019. These changes decreased depreciation expense by $7.8 million and $24.5 million for the three and nine months ended September 30, 2019, respectively, and increased net income by $6.4 million and $20.3 million for the three and nine months ended September 30, 2019, respectively, or $0.04 and $0.12 per share, for the three and nine months ended September 30, 2019, respectively. Operating Leases The Company enters into operating leases for real estate assets related to office space and co-location assets related to space or racks at co-location facilities and related equipment for its servers and other networking equipment. The Company determines if an arrangement contains a lease at the inception of a contract by assessing whether there is an identified asset and whether the contract conveys the right to control the use of the identified asset in exchange for consideration and the right to obtain the economic benefits from the use of the identified asset. Upon commencement of a lease, the Company records an ROU asset that represents the Company’s right to use the underlying asset for the lease term and a lease liability that represents an obligation to make lease payments arising from the lease. ROU assets and lease liabilities are recognized at the commencement date based on the present value of lease payments over the lease term. Lease payments are discounted at the lease commencement date using the rate implicit in the lease unless that rate is not readily determinable. As most of the Company’s leases do not provide an implicit rate, an incremental borrowing rate has been applied based on the Company's credit-adjusted risk-free rate. The incremental borrowing rate at January 1, 2019 (the date the new lease standard was adopted) was used to calculate the present value of the Company’s lease portfolio as of that date. The Company often enters into contracts that contain both lease and non-lease components. Real estate non-lease components include real estate taxes, insurance, maintenance, parking and other operating costs. Co-location non-lease components include utilities and other operating costs. As of January 1, 2019, the Company includes both lease and non-lease components of fixed costs in its lease arrangements as a single lease component. Variable costs, such as utilities based on actual usage, are not included in the measurement of ROU assets and lease liabilities but are expensed when the event determining the amount of variable consideration to be paid occurs. The Company’s lease terms often include renewal options and, particularly in the case of co-location arrangements, may include evergreen provisions. The Company’s ROU assets and lease liabilities generally do not include the options to extend, or terminate, unless it is reasonably certain that the Company will exercise these options. The Company has elected to exclude leases for certain networking equipment with terms of 12 months or less from its ROU assets and lease liabilities on its consolidated balance sheet. Lease expense is recognized on a straight-line basis over the lease term. Equity Method Investments The Company accounts for equity investments in which it has significant influence, but not a controlling financial interest, using the equity method of accounting. Under the equity method of accounting, investments are initially recorded at cost, less impairment, and subsequently adjusted to recognize the Company’s share of earnings or losses. In February 2019, the Company and Mitsubishi UFJ Financial Group ("MUFG") announced the establishment of a joint venture, the Global Open Network, Inc. ("GO-NET"), and their plans to offer a new blockchain-based online payment network. The Company's 20% stake in GO-NET is accounted for using the equity method. As of September 30, 2019, the Company's $36.0 million investment is included in other assets on the consolidated balance sheet. The Company recorded a loss of $1.4 million during the three months ended September 30, 2019 which reflects its share of the losses incurred by GO-NET during the period. Recent Accounting Pronouncements In June 2016, the FASB issued guidance that introduces a new methodology for accounting for credit losses on financial instruments, including available-for-sale debt securities. The guidance establishes a new "expected loss model" that requires entities to estimate current expected credit losses on financial instruments by using all practical and relevant information. Any expected credit losses are to be reflected as allowances rather than reductions in the amortized cost of available-for-sale debt securities. This guidance will be effective for the Company on January 1, 2020. The Company does not expect application of this guidance to have a material impact on its consolidated financial statements. In August 2018, the FASB issued guidance that changes fair value measurement disclosure requirements. This guidance will be effective for the Company on January 1, 2020. The Company is evaluating the impact the update will have on its disclosures. In August 2018, the FASB issued guidance that addresses a customer’s accounting for implementation costs incurred in a cloud computing arrangement that is a service contract. The guidance aligns the accounting for costs incurred to implement a cloud computing arrangement that is a service arrangement with the guidance for capitalizing costs associated with developing or obtaining internal-use software. This guidance will be effective for the Company on January 1, 2020. The Company is evaluating the potential impact of adopting this new accounting guidance on its consolidated financial statements.