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Commitments and Contingencies (Class Action Litigation) (Details) - lawsuit | 1 Months Ended | 23 Months Ended
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Jan. 31, 2016 | Nov. 30, 2015 | Dec. 31, 2017
Lawsuits Filed in the United States District Court for the Southern District of Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 1 | 4 |
Derivative Lawsuit Against Officers and Directors |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 3 |  |
Derivative Lawsuit Filed in District Court of Harris County, Texas |  |  |
Loss Contingencies [Line Items] |  |  |
Number of lawsuits filed | 2 |  | 1

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- Definition The total number of new claims filed pertaining to a loss contingency during the period. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 450 -SubTopic 20 -Section 50 -Paragraph 4 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=82911808&loc=d3e14435-108349 + Details
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