|
Derivative Financial Instruments Derivative Financial Instruments (Narrative) (Details) (USD $)
|
12 Months Ended | 0 Months Ended | 1 Months Ended | 12 Months Ended | 0 Months Ended | 12 Months Ended | ||||||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Dec. 31, 2013
|
Dec. 31, 2012
|
Dec. 31, 2011
|
Dec. 31, 2013
Commodity Contract [Member]
|
Dec. 31, 2012
Commodity Contract [Member]
|
Dec. 31, 2013
Interest Rate Contract [Member]
|
Dec. 31, 2012
Interest Rate Contract [Member]
|
Oct. 03, 2013
Cash Flow Hedging [Member]
Interest Rate Contract [Member]
|
Nov. 15, 2012
Cash Flow Hedging [Member]
Interest Rate Contract [Member]
|
Dec. 31, 2013
Fair Value Hedging [Member]
bbl
|
Dec. 31, 2013
Fair Value Hedging [Member]
Commodity Contract [Member]
bbl
|
Dec. 31, 2012
Fair Value Hedging [Member]
Commodity Contract [Member]
bbl
|
Dec. 31, 2013
Fair Value Hedging [Member]
Commodity Contract [Member]
Other Noncurrent Assets [Member]
|
Dec. 31, 2012
Fair Value Hedging [Member]
Commodity Contract [Member]
Other Noncurrent Assets [Member]
|
Dec. 31, 2013
Fair Value Hedging [Member]
Commodity Contract [Member]
Other Current Assets [Member]
|
Dec. 31, 2012
Fair Value Hedging [Member]
Commodity Contract [Member]
Other Current Assets [Member]
|
Sep. 15, 2011
Fair Value Hedging [Member]
Interest Rate Swap [Member]
|
Dec. 31, 2013
Interest Expense [Member]
|
Dec. 31, 2013
6.45% Notes Due 2014 [Member]
Senior Notes [Member]
|
||||||||
| Derivative [Line Items] | ||||||||||||||||||||||||||
| Derivative, Notional Amount | $ 150,000,000 | $ 250,000,000 | $ 100,000,000 | |||||||||||||||||||||||
| Net gain (loss) on cash flow hedges(1) | (4,744,000) | [1],[2] | 13,889,000 | [1],[2] | 7,739,000 | [1],[2] | (4,560,000) | 2,912,000 | (184,000) | 10,977,000 | (200,000) | 11,000,000 | ||||||||||||||
| Unrealized Gain Loss From Fair Value Hedge Agreements | (8,700,000) | (5,700,000) | (8,900,000) | (5,500,000) | 200,000 | (200,000) | 5,900,000 | |||||||||||||||||||
| Debt Instrument, Face Amount | 2,700,000,000.0 | 2,400,000,000.0 | 250,000,000 | 250,000,000 | 250,000,000 | |||||||||||||||||||||
| Debt Instrument, Interest Rate, Stated Percentage | 6.45% | 6.40% | 6.45% | |||||||||||||||||||||||
| Energy commodity derivatives deposits | 14,782,000 | 18,304,000 | ||||||||||||||||||||||||
| Derivative, Nonmonetary Notional Amount | 700,000 | 700,000 | 700,000 | |||||||||||||||||||||||
| Cash Flow Hedge Gain (Loss) to be Reclassified within Twelve Months | $ 100,000 | |||||||||||||||||||||||||
|
||||||||||||||||||||||||||