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Summary of Significant Accounting Policies - Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Jan. 01, 2019
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New Accounting Pronouncement, Early Adoption |  |
Lease liability | $ 40,490 |
Right of use assets | $ 40,490 |
Accounting Standards Update 2016-02 | Minimum |  |
New Accounting Pronouncement, Early Adoption |  |
Lease liability |  | $ 42,800
Accounting Standards Update 2016-02 | Maximum |  |
New Accounting Pronouncement, Early Adoption |  |
Right of use assets |  | $ 42,800

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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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