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Discontinued Operations (Summary of Assets and Liabilities) (Details) - USD ($)
$ in Thousands
Dec. 31, 2015
Dec. 31, 2014
Dec. 31, 2013
Carrying amount of assets included as part of discontinued operations:      
Cash and cash equivalents $ 0 $ 942 $ 0
Hereford Production Facility [Member] | Discontinued Operations, Held-for-sale [Member]      
Carrying amount of assets included as part of discontinued operations:      
Cash and cash equivalents   942  
Accounts receivable - trade   1,625  
Inventories, at lower of cost or market   25,868  
Prepaid expenses and other current assets   3,062  
Property, plant and equipment, net   5,043  
Other assets   515  
Deferred tax assets   19,273  
Total assets classified as held for sale in the condensed consolidated balance sheet   56,328  
Carrying amount of liabilities included as part of discontinued operations:      
Trade accounts payable and accrued liabilities   5,728  
Income taxes payable   7,238  
Deferred income taxes, net   (41)  
Total liabilities classified as held for sale in the condensed consolidated balance sheet   $ 12,925