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Summary of Significant Accounting Policies, Balance Sheet (Details) - USD ($) $ in Thousands | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Balance Sheet [Abstract] |  |
Operating lease right-of-use assets | $ 36,020 | $ 0
Sundry payables and accrued expenses | 38,819 | 31,033
Noncurrent operating lease liabilities | $ 28,376 | 0
ASU 2016-02 [Member] |  |
Balance Sheet [Abstract] |  |
Operating lease right-of-use assets |  | 38,580
Sundry payables and accrued expenses |  | 38,265
Noncurrent operating lease liabilities |  | 31,348
ASU 2016-02 [Member] | Adjustments due to Adoption of ASU 2016-02 [Member] |  |
Balance Sheet [Abstract] |  |
Operating lease right-of-use assets |  | 38,580
Sundry payables and accrued expenses |  | 7,232
Noncurrent operating lease liabilities |  | $ 31,348

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- Definition Present value of lessee's discounted obligation for lease payments from operating lease, classified as noncurrent. + 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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