|
Risk Management Activities (Details) (USD $)
|
3 Months Ended |
6 Months Ended |
|
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Jun. 30, 2013
|
Jun. 30, 2012
|
Dec. 31, 2012
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Derivatives Assets, Current |
$ 105,667,000 |
|
$ 105,667,000 |
|
$ 166,135,000 |
| Derivative Liabilities, Current |
5,482,000 |
|
5,482,000 |
|
7,617,000 |
| Foreign Currency Exchange Rate Derivative [Abstract] |
|
|
|
|
|
| After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From The Foreign Currency Swap |
(700,000) |
(900,000) |
1,000,000 |
700,000 |
|
| Interest Rate Derivative [Abstract] |
|
|
|
|
|
| Interest Rate Swap, Notional Amount |
350,000,000 |
|
350,000,000 |
|
|
| After-Tax Net Impact Other Comprehensive Income Increase (Decrease) From Interest Rate Swap |
400,000 |
100,000 |
800,000 |
(200,000) |
|
| Derivative Collateral [Abstract] |
|
|
|
|
|
| Collateral Held on Derivative |
5,000,000 |
|
5,000,000 |
|
6,000,000 |
|
Crude Oil and Natural Gas Derivative Contracts [Member] | Assets From Price Risk Management Activities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Derivatives Assets, Current |
106,000,000 |
|
106,000,000 |
|
166,000,000 |
| Derivative Assets, Current, Gross |
163,000,000 |
|
163,000,000 |
|
271,000,000 |
| Derivative Liabilities, Current, Gross |
57,000,000 |
|
57,000,000 |
|
105,000,000 |
|
Crude Oil and Natural Gas Derivative Contracts [Member] | Liabilities From Price Risk Management Activities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Derivative Liabilities, Current |
5,000,000 |
|
5,000,000 |
|
8,000,000 |
| Derivative Assets, Current, Gross |
57,000,000 |
|
57,000,000 |
|
105,000,000 |
| Derivative Assets, Noncurrent, Gross |
3,000,000 |
|
3,000,000 |
|
|
| Derivative Liabilities, Current, Gross |
62,000,000 |
|
62,000,000 |
|
113,000,000 |
| Derivative Liabilities, Noncurrent, Gross |
4,000,000 |
|
4,000,000 |
|
13,000,000 |
|
Crude Oil and Natural Gas Derivative Contracts [Member] | Other Assets [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Other Assets |
7,000,000 |
|
7,000,000 |
|
0 |
| Derivative Assets, Noncurrent, Gross |
10,000,000 |
|
10,000,000 |
|
|
| Derivative Liabilities, Noncurrent, Gross |
3,000,000 |
|
3,000,000 |
|
|
|
Crude Oil and Natural Gas Derivative Contracts [Member] | Other Liabilities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Other Liabilities |
1,000,000 |
|
1,000,000 |
|
13,000,000 |
|
Foreign Currency Swap [Member] | Other Current Liabilities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Derivative Liabilities, Current |
43,000,000 |
|
43,000,000 |
|
0 |
|
Foreign Currency Swap [Member] | Other Liabilities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Other Liabilities |
0 |
|
0 |
|
55,000,000 |
|
Interest Rate Swap [Member] | Other Current Liabilities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Derivative Liabilities, Current |
2,000,000 |
|
2,000,000 |
|
0 |
|
Interest Rate Swap [Member] | Other Liabilities [Member]
|
|
|
|
|
|
| Derivatives, Fair Value [Line Items] |
|
|
|
|
|
| Other Liabilities |
$ 0 |
|
$ 0 |
|
$ 4,000,000 |
|
Crude Oil Derivative Contracts January (closed) [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
101,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
99.29 |
|
|
|
Crude Oil Derivative Contracts February - April (closed) [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
109,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
99.17 |
|
|
|
Crude Oil Derivative Contracts May - June (closed) [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
101,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
99.29 |
|
|
|
Crude Oil Derivative Contracts July - September [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
111,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
98.25 |
|
|
|
Crude Oil Derivative Contracts October - December [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
103,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
98.26 |
|
|
| Volumes (Bbld) - Derivative Option Contracts |
|
|
8,000 |
|
|
| Average Price ($/Bbl) - Derivative Option Contracts |
|
|
98.11 |
|
|
|
Crude Oil Derivative Contracts Year Two January - March [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
85,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
96.24 |
|
|
|
Crude Oil Derivative Contracts Year Two January - June [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volumes (Bbld) - Derivative Option Contracts |
|
|
54,000 |
|
|
| Average Price ($/Bbl) - Derivative Option Contracts |
|
|
98.91 |
|
|
|
Crude Oil Derivative Contracts Year Two April - June [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (Bbld) |
|
|
75,000 |
|
|
| Derivative Weighted Average Price Crude Oil ($/Bbl) |
|
|
96.20 |
|
|
|
Crude Oil Derivative Contracts Year Two July - December [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volumes (Bbld) - Derivative Option Contracts |
|
|
75,000 |
|
|
| Average Price ($/Bbl) - Derivative Option Contracts |
|
|
96.20 |
|
|
|
Crude Oil Derivative Contracts Year Two April - December [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volumes (Bbld) - Derivative Option Contracts |
|
|
10,000 |
|
|
| Average Price ($/Bbl) - Derivative Option Contracts |
|
|
96.60 |
|
|
|
Natural Gas Derivative Contracts January - April (closed) [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (MMBtud) |
|
|
150,000 |
|
|
| Derivative Weighted Average Price Natural Gas ($/MMBtu) |
|
|
4.79 |
|
|
|
Natural Gas Derivative Contracts May - July (closed) [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (MMBtud) |
|
|
200,000 |
|
|
| Derivative Weighted Average Price Natural Gas ($/MMBtu) |
|
|
4.72 |
|
|
|
Natural Gas Derivative Contracts August - October [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (MMBtud) |
|
|
200,000 |
|
|
| Derivative Weighted Average Price Natural Gas ($/MMBtu) |
|
|
4.72 |
|
|
| Volumes (MMBtud) - Derivative Option Contracts |
|
|
200,000 |
|
|
| Average Price ($/MMBtu) - Derivative Option Contracts |
|
|
4.72 |
|
|
|
Natural Gas Derivative Contracts November - December [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (MMBtud) |
|
|
150,000 |
|
|
| Derivative Weighted Average Price Natural Gas ($/MMBtu) |
|
|
4.79 |
|
|
| Volumes (MMBtud) - Derivative Option Contracts |
|
|
150,000 |
|
|
| Average Price ($/MMBtu) - Derivative Option Contracts |
|
|
4.79 |
|
|
|
Natural Gas Derivative Contracts Year Two January - December [Member]
|
|
|
|
|
|
| Derivative [Line Items] |
|
|
|
|
|
| Volume (MMBtud) |
|
|
170,000 |
|
|
| Derivative Weighted Average Price Natural Gas ($/MMBtu) |
|
|
4.54 |
|
|
| Volumes (MMBtud) - Derivative Option Contracts |
|
|
320,000 |
|
|
| Average Price ($/MMBtu) - Derivative Option Contracts |
|
|
4.66 |
|
|