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Financial Instruments and Risk Management (Narrative) (Details)
CAD in Billions
3 Months Ended 6 Months Ended
Jun. 30, 2016
USD ($)
Dec. 31, 2016
USD ($)
Jun. 30, 2016
USD ($)
Jun. 30, 2015
USD ($)
Jun. 30, 2016
CAD
item
Jun. 30, 2016
USD ($)
item
Dec. 31, 2015
USD ($)
item
May 31, 2012
USD ($)
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Deferred loss charged to income     $ 1,482,000          
Number of offsetting positions | item         0 0 0  
Impairment Expense     $ 95,088,000          
10-Year Notes [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Note term     10 years          
Face amount of notes               $ 350,000,000
Scenario, Forecast [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Deferred loss charged to income   $ 1,500,000            
Commodity Derivative Contracts [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Increase (decrease) of income before taxes due to the impact of marking to market of derivative contracts     $ (2,600,000) $ 7,400,000        
Interest Rate Swap [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Loss deferred for fair value of interest rate derivative contracts, net of tax           $ 11,300,000    
Income tax on deferred loss on fair value of interest rate derivative contracts           6,100,000    
Foreign Exchange Derivative Contracts [Member] | Currency, U.S. Dollar [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Short-term derivative instruments       $ 8,000,000   5,800,000    
Forward Sale Contracts [Member] | Currency, Canadian Dollar [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Gain charged to income $ 26,800,000              
Short-term derivative instruments | CAD         CAD 1.0      
Accounts Receivable [Member] | Nondesignated [Member] | Commodity Derivative Contracts [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Fair value of commodity derivative contracts           $ 1,709,000 $ 89,358,000  
Syncrude Canada Ltd. [Member]                
Derivative Instruments and Hedging Activities Disclosures [Line Items]                
Percentage of interest in oil and gas property sold during period 5.00%