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Fair Value Measurements - Assets and Liabilities Measured at Fair Value on Recurring Basis (Details) - Derivative Instruments Liabilities [Member] - Recurring [Member] - USD ($) $ in Thousands | Sep. 30, 2019 | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | --- | ---
Liabilities [Abstract] |  |  |
Total Liabilities | $ 20,410 | $ 33 | $ 560
Level 3 [Member] |  |  |
Liabilities [Abstract] |  |  |
Total Liabilities | $ 20,410 | $ 33 | $ 560

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- Definition Fair value of financial and nonfinancial obligations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 820 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=117815213&loc=d3e19207-110258 + Details
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