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Commitments and Contingencies Commitments and Contingencies (Class Action Litigation) (Details) - lawsuit | 1 Months Ended
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Jan. 27, 2016 | Nov. 30, 2015
Lawsuits Filed in the United States District Court for the Southern District of Texas [Member] |  |
Loss Contingencies [Line Items] |  |
Number of lawsuits filed |  | 4
Subsequent Event [Member] | Derivative Lawsuit Against Officers and Directors [Member] |  |
Loss Contingencies [Line Items] |  |
Number of lawsuits filed | 3 |
Subsequent Event [Member] | Derivative Lawsuit Filed in District Court of Harris County, Texas [Member] |  |
Loss Contingencies [Line Items] |  |
Number of lawsuits filed | 2 |
Subsequent Event [Member] | Derivative Lawsuit Filed in the United States District Court for Southern District of Texas [Member] |  |
Loss Contingencies [Line Items] |  |
Number of lawsuits filed | 1 |

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- Definition Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table. + References No definition available. + Details
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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=25496072&loc=d3e14435-108349 + Details
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