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Commitments and Contingencies (Details) - USD ($)
$ in Thousands
6 Months Ended 12 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2014
Commitments and Contingencies [Line Items]      
Payments for capital improvements $ 5,343 $ 5,403  
Byhalia Mississippi [Member]      
Commitments and Contingencies [Line Items]      
Payments for capital improvements     $ 15,300