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Discontinued Operations (Narrative) (Details) - Carrizo United Kingdom [Member] - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Feb. 22, 2013
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Percentage of non-operating working interest and overriding royalty interests     15.00%
Discontinued Operations, Sale Price     $ 184.0
Liabilities of disposal group, including discontinued operation $ 8.3 $ 12.8  
Huntington Field Development Project Credit Facility [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Line of Credit Facility, Amount Outstanding     $ 55.0