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Leases - Additional Information (Details) $ in Thousands | 6 Months Ended |
--- | --- | ---
Jun. 30, 2019 USD ($) ft² | Dec. 31, 2018 USD ($)
Operating Leased Assets [Line Items] |  |
Operating lease, right of use asset | $ 89,631 | $ 0
Operating lease, liability | 117,447 |
UNITED STATES |  |
Operating Leased Assets [Line Items] |  |
Operating lease, right of use asset | 73,200 |
Operating lease, liability | 100,200 |
UNITED STATES | Northern Virginia Office Space |  |
Operating Leased Assets [Line Items] |  |
Operating lease, right of use asset | 68,600 |
Operating lease, liability | $ 95,600 |
Area of office space | ft² | 214,000 |
Lease term expiration date | Dec. 31, 2030 |
Lease option to extend, description | option for the Company to extend the term for an additional five or 10 consecutive years |
UNITED STATES | Minimum | Northern Virginia Office Space |  |
Operating Leased Assets [Line Items] |  |
Lease extension term | 5 years |
UNITED STATES | Maximum | Northern Virginia Office Space |  |
Operating Leased Assets [Line Items] |  |
Lease extension term | 10 years |
Non-US |  |
Operating Leased Assets [Line Items] |  |
Operating lease, right of use asset | $ 16,400 |
Operating lease, liability | $ 17,200 |

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- Definition Area of Office Space. + References No definition available. + Details
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- Definition Date which lease or group of leases is set to expire, in CCYY-MM-DD format. + References No definition available. + Details
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- Definition Description of terms and conditions of option to extend lessee's operating lease. Includes, but is not limited to, information about option recognized as part of right-of-use asset and lease liability. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Term of lessee's operating lease renewal, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (a)(3) -URI http://asc.fasb.org/extlink&oid=77888426&loc=SL77918673-209980 + Details
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- Definition Present value of lessee's discounted obligation for lease payments from operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Amount of lessee's right to use underlying asset under operating lease. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 842 -SubTopic 20 -Section 45 -Paragraph 1 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=77888419&loc=SL77918627-209977 + Details
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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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