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Stockholders' Equity and Noncontrolling Interests Warrants (Details) - $ / shares shares in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Class of Warrant or Right [Line Items] |  |
Outstanding warrants (in shares) | 15 | 22
Second Tranche of Warrants [Member] |  |
Class of Warrant or Right [Line Items] |  |
Exercise price (in dollars per share) | $ 18.33 |

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- Definition Exercise price per share or per unit of warrants or rights outstanding. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08.(i)(4)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
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