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Additional Balance Sheet Details (Trade Accounts Receivable, net) (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Receivables [Abstract]    
Trade accounts receivable, net $ 43,291 $ 45,407
Commodity derivatives settlement receivables 38,896 59,755
Federal income tax receivable, net 0 37,652
Other receivables 16,670 14,141
Total $ 98,857 $ 156,955