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Derivative Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Asset derivatives:
Derivative instruments, at fair value	$ 183,727	$ 304,237
Liability derivatives:
Derivative instruments, at fair value	92,107	75,562
Margin deposits received (remitted to) counterparties	(1,100)	(700)
Commodity derivatives
Asset derivatives:
Derivative instruments, at fair value	183,727	304,237
Derivative instruments subject to master netting agreements	(66,428)	(73,753)
Derivative instruments, net	117,299	230,484
Liability derivatives:
Derivative instruments, at fair value	92,107	75,562
Derivative instruments subject to master netting agreements	(66,428)	(73,753)
Margin deposits received (remitted to) counterparties	(1,125)	(736)
Derivative instruments, net	$ 24,554	$ 1,073

Fair value of liability associated with derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative liability, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details

- Definition

Fair value of derivative asset, presented on a gross basis even when the derivative instrument is subject to master netting arrangements and qualifies for net presentation in the statement of financial position.

+ References+ Details