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Summary of Significant Accounting Policies (Details) - USD ($) $ in Thousands | Jun. 30, 2019 | Dec. 31, 2018
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New Accounting Pronouncements [Abstract] |  |
Renewal option period | 5 years |
Balance Sheet [Abstract] |  |
Operating lease right-of-use asset | $ 35,648 | $ 0
Sundry payables and accrued expenses |  | 31,033
Noncurrent operating lease liabilities | $ 28,613 | 0
ASU 2016-02 [Member] |  |
Balance Sheet [Abstract] |  |
Operating lease right-of-use asset |  | 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 asset |  | 38,580
Sundry payables and accrued expenses |  | 7,232
Noncurrent operating lease liabilities |  | $ 31,348

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