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Accounts Receivable (Details) - USD ($)
$ in Thousands
Jun. 30, 2015
Dec. 31, 2014
Accounts Receivable, Net [Abstract]    
Trade customers $ 575,609 $ 525,546
Affiliates 0 437
Allowance for doubtful accounts (13,468) (13,468)
Receivables from trade customers and affiliates, net 562,141 512,515
Federal and state taxes 11,746 8,919
Other 26,835 39,232
Accounts receivable, net $ 600,722 $ 560,666