Commitments and Contingencies	6 Months Ended
Jun. 30, 2018
Commitments And Contingencies Disclosure [Abstract]
Commitments and Contingencies	(5) Commitments and Contingencies (a) Commitments From time to time, the Company enters into certain types of contracts that require it to indemnify parties against third-party claims. These contracts primarily relate to agreements under which the Company assumes indemnity obligations for intellectual property infringement, as well as other obligations from time to time depending on arrangements negotiated with customers and other third parties. The conditions of these obligations vary. Thus, the overall maximum amount of the Company’s indemnification obligations cannot be reasonably estimated. Historically, the Company has not been obligated to make significant payments for these obligations and does not currently expect to incur any material obligations in the future. Accordingly, the Company has not recorded an indemnification liability on its balance sheets as of June 30, 2018 or December 31, 2017. The Company leases office space and computer and other equipment under operating lease agreements. Under the lease agreements, in addition to base rent, the Company is generally responsible for certain taxes, utilities and maintenance costs, and other fees. Several of these leases include options for renewal or purchase. The Company does not have any material capital leases. The Company leases approximately 214,000 square feet of office space at a location in Northern Virginia that began serving as its corporate headquarters in October 2010. In January 2018, the Company amended the lease to extend the lease term through December 2030. The amended lease also provides for certain tenant allowances and incentives. At June 30, 2018 and December 31, 2017, deferred rent of $27.3 million and $8.5 million, respectively, was included in other long-term liabilities. As a result of the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), the Company estimated and recorded a one-time $40.3 million tax expense related to the mandatory deemed repatriation transition tax (“Transition Tax”) during the year ended December 31, 2017. At June 30, 2018, $32.5 million of the Transition Tax was unpaid and was included in “Other long-term liabilities.” (b) Contingencies The Company is involved in various legal proceedings arising in the normal course of business. Although the outcomes of these legal proceedings are inherently difficult to predict, management does not expect the resolution of these legal proceedings to have a material adverse effect on the Company’s financial position, results of operations, or cash flows. The Company has contingent liabilities that, in management’s judgment, are not probable of assertion. If such unasserted contingent liabilities were to be asserted, or become probable of assertion, the Company may be required to record significant expenses and liabilities in the period in which these liabilities are asserted or become probable of assertion.

(5) Commitments and Contingencies

(a) Commitments

From time to time, the Company enters into certain types of contracts that require it to indemnify parties against third-party claims. These contracts primarily relate to agreements under which the Company assumes indemnity obligations for intellectual property infringement, as well as other obligations from time to time depending on arrangements negotiated with customers and other third parties. The conditions of these obligations vary. Thus, the overall maximum amount of the Company’s indemnification obligations cannot be reasonably estimated. Historically, the Company has not been obligated to make significant payments for these obligations and does not currently expect to incur any material obligations in the future. Accordingly, the Company has not recorded an indemnification liability on its balance sheets as of June 30, 2018 or December 31, 2017.

The Company leases office space and computer and other equipment under operating lease agreements. Under the lease agreements, in addition to base rent, the Company is generally responsible for certain taxes, utilities and maintenance costs, and other fees. Several of these leases include options for renewal or purchase. The Company does not have any material capital leases. The Company leases approximately 214,000 square feet of office space at a location in Northern Virginia that began serving as its corporate headquarters in October 2010. In January 2018, the Company amended the lease to extend the lease term through December 2030. The amended lease also provides for certain tenant allowances and incentives. At June 30, 2018 and December 31, 2017, deferred rent of $27.3 million and $8.5 million, respectively, was included in other long-term liabilities.

As a result of the U.S. government enacted comprehensive tax legislation commonly referred to as the Tax Cuts and Jobs Act (the “Tax Act”), the Company estimated and recorded a one-time $40.3 million tax expense related to the mandatory deemed repatriation transition tax (“Transition Tax”) during the year ended December 31, 2017. At June 30, 2018, $32.5 million of the Transition Tax was unpaid and was included in “Other long-term liabilities.”

(b) Contingencies

The Company is involved in various legal proceedings arising in the normal course of business. Although the outcomes of these legal proceedings are inherently difficult to predict, management does not expect the resolution of these legal proceedings to have a material adverse effect on the Company’s financial position, results of operations, or cash flows.

The Company has contingent liabilities that, in management’s judgment, are not probable of assertion. If such unasserted contingent liabilities were to be asserted, or become probable of assertion, the Company may be required to record significant expenses and liabilities in the period in which these liabilities are asserted or become probable of assertion.