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Derivative Instruments (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Asset derivatives:
Derivative instruments, at fair value	$ 230,139	$ 304,237
Liability derivatives:
Derivative instruments, at fair value	36,471	75,562
Margin deposits received (remitted to) counterparties	(700)	(700)
Commodity derivatives
Asset derivatives:
Derivative instruments, at fair value	230,139	304,237
Derivative instruments subject to master netting agreements	(35,437)	(73,753)
Derivative instruments, net	194,702	230,484
Liability derivatives:
Derivative instruments, at fair value	36,471	75,562
Derivative instruments subject to master netting agreements	(35,437)	(73,753)
Margin deposits received (remitted to) counterparties	(656)	(736)
Derivative instruments, net	$ 378	$ 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