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Financial Instruments (Changes in Level 3 Inputs) (Details) - USD ($)
$ in Thousands
3 Months Ended 12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Dec. 31, 2014
Fair Value, Inputs, Level 3 [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Fair Value, Concentration of Risk, Derivative Instruments, Assets $ 300    
Level 3 liability balance 2,554 $ 0 $ 0
Change in fair value, recognized in earnings      
Change in fair value, recognized in other comprehensive income (1,460) 3,852  
Fair Value, Inputs, Level 3 [Member] | Cost of products sold      
Change in fair value, recognized in earnings      
Change in fair value recognized in earnings (1,094) 0  
Fair Value, Inputs, Level 3 [Member] | Sales [Member]      
Change in fair value, recognized in earnings      
Settlement date fair value, recognized in earnings 0 $ (3,852)  
Osage Pipeline [Member] [Member]      
Fair Value, Liabilities Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]      
Assets, Fair Value Disclosure, Nonrecurring $ 44,400