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Fair Value Measurement - Quantitative Information Related to Significant Unobservable Inputs Utilized to Calculate Fair Value (Details) $ in Thousands | Jun. 30, 2019 USD ($) | Dec. 31, 2018 USD ($)
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Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Derivative liability | $ 0 | $ 10,677
Market Approach |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Equity securities - preferred stock investment | 11,116 |
Level 3 | Discounted Cash Flow |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Derivative liability | $ 0 |
Credit Risk | Level 3 | Discounted Cash Flow |  |
Fair Value Inputs, Liabilities, Quantitative Information [Line Items] |  |
Range/Input Value | 0.0362 |

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- Definition Fair value, after the effects of master netting arrangements, of a financial liability or contract with one or more underlyings, notional amount or payment provision or both, and the contract can be net settled by means outside the contract or delivery of an asset. Includes liabilities not subject to a master netting arrangement and not elected to be offset. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 50 -Paragraph 3 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=51824906&loc=SL20225862-175312 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 825 -SubTopic 10 -Section 50 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=118260190&loc=d3e13433-108611 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 20 -Section 55 -Paragraph 10 -URI http://asc.fasb.org/extlink&oid=99393222&loc=SL20226008-175313 + Details
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