XML 16 R33.htm IDEA: XBRL DOCUMENT

Disclosures about Derivative Instruments and Hedging Activities (Details 3) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Natural gas swaps
Liabilities:
Fair Value of liabilities	$ 4,265	$ 7,220
Interest rate options
Assets:
Fair value of assets	39,215	69,446
Total designated as hedges \| Natural gas swaps
Liabilities:
Fair Value of liabilities	4,265
Total not designated as hedges \| Interest rate options
Assets:
Fair value of assets	$ 39,215

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