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Derivative Financial Instruments (Narrative) (Details) (USD $)
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3 Months Ended | 6 Months Ended | 3 Months Ended | 12 Months Ended | 6 Months Ended | |||||||||||||
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Jun. 30, 2014
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Jun. 30, 2013
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Jun. 30, 2014
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Jun. 30, 2013
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Dec. 31, 2013
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Jun. 30, 2014
Cash Flow Hedging [Member]
Interest Rate Contract [Member]
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Mar. 31, 2014
Cash Flow Hedging [Member]
Interest Rate Contract [Member]
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Dec. 31, 2012
Cash Flow Hedging [Member]
Interest Rate Contract [Member]
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Jun. 30, 2014
Fair Value Hedging [Member]
bbl
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Jun. 30, 2014
Fair Value Hedging [Member]
NYMEX Commodity Contracts [Member]
bbl
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Jun. 30, 2014
Fair Value Hedging [Member]
NYMEX Commodity Contracts [Member]
Other Noncurrent Assets [Member]
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Jun. 30, 2014
Fair Value Hedging [Member]
NYMEX Commodity Contracts [Member]
Other Current Assets [Member]
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| Derivative [Line Items] | ||||||||||||||||||
| Derivative, Notional Amount | $ 200,000,000 | |||||||||||||||||
| Debt Instrument, Face Amount | 2,900,000,000.0 | 2,900,000,000.0 | 2,700,000,000.0 | 250,000,000 | ||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 5.15% | |||||||||||||||||
| Net loss on cash flow hedges(1) | 0 | [1] | 0 | [1] | (3,613,000) | [1] | (4,560,000) | [1] | (3,613,000) | 11,000,000 | ||||||||
| Derivative Instruments, Gain (Loss) Recognized in Income, Ineffective Portion and Amount Excluded from Effectiveness Testing, Net | 183,000 | |||||||||||||||||
| Energy commodity derivatives deposits | 29,070,000 | 29,070,000 | 14,782,000 | |||||||||||||||
| Derivative, Nonmonetary Notional Amount | 700,000 | 700,000 | ||||||||||||||||
| Unrealized Gain (Loss) From Fair Value Hedge Agreements | (14,900,000) | (14,700,000) | (200,000) | |||||||||||||||
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ (300,000) | |||||||||||||||||
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