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Recent Accounting Pronouncements (Details) - USD ($) $ in Thousands | Jan. 01, 2019 | Jan. 01, 2018 | Dec. 31, 2017
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New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect of Accounting Change (1) |  |  | $ 0
Accounting Standards Update 2016-01 [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Cumulative Effect of Accounting Change (1) |  | $ (2,229) |
Subsequent Event [Member] |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Operating Lease, Liability | $ 210,000 |  |

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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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