Derivative Financial Instruments Textuals Abstract.

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Effect of derivative instruments on statement of operations.

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- Definition

Aggregate notional amount of derivative expressed in nonmonetary units. For example the number of barrels specified in a fuel oil forward purchase contract.

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- Definition

Description of the interest rate as being fixed or variable, and, if variable, identification of the index or rate on which the interest rate is based and the number of points or percentage added to that index or rate to set the rate, and other pertinent information, such as frequency of rate resets.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Section 02
-Paragraph 22
-Article 5

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 129
-Paragraph 2, 4

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The high end of the range of time remaining until maturity when a range is presented for a group of derivatives.

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- Definition

The portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments representing (a) the amount of the hedge ineffectiveness and (b) the amount, if any, excluded from the assessment of hedge effectiveness.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 205G

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 44C
-Subparagraph b

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The effective portion of gains and losses (net) on derivative instruments designated and qualifying as hedging instruments that was recognized in other comprehensive income during the current period.

+ References

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- Definition

Net gain (loss) included in earnings for the period from the net change in fair value of derivative instrument not designated as hedging instrument.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 133
-Paragraph 45
-Subparagraph b(1)(b)

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The low end of the range of time remaining until maturity when a range is presented for a group of derivatives.

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The number of derivative instruments of a particular group held by the entity.

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Derivative Financial Instruments (Details 1) (USD $) In Thousands, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Effect of derivative instruments on the statement of operations
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	$ 5,475	$ 4,511	$ 10,704	$ 5,505
Amount Reclassified from Accumulated OCI into Income	0	(89)	0	(89)
Interest rate swaps [Member]
Effect of derivative instruments on the statement of operations
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	5,531	4,334	10,698	5,598
Natural Gas Swaps [Member]
Effect of derivative instruments on the statement of operations
Amount of Gain (Loss) Recognized in OCI on Derivative (Effective Portion)	(56)	177	6	(93)
Derivative Financial Instruments (Textuals) [Abstract]
Fixed natural gas price swap contracts	18		18
Maturity period of fixed natural gas price swap contracts, Beginning	40725		40725
Maturity period of fixed natural gas price swap contracts, Ending	40878		40878
Aggregate notional amount of fixed natural gas price swap contracts	515,000		515,000
Natural Gas Swaps [Member] \| Other Gains (Losses) Net [Member]
Effect of derivative instruments on the statement of operations
Derivative Instruments Not Designated as Hedging Instruments, Gain (Loss), Net	0	202	0	202
Interest expense, net of amounts capitalized [Member]
Effect of derivative instruments on the statement of operations
Amount Reclassified from Accumulated OCI into Income	0		0
Other Gains (Losses) Net [Member]
Effect of derivative instruments on the statement of operations
Amount Reclassified from Accumulated OCI into Income	$ 0	$ (89)	$ 0	$ (89)
One Billion Credit Facility [Member]
Derivative Financial Instruments (Textuals) [Abstract]
Weighted average fixed rate			weighted average fixed rate of 3.94% plus the applicable margin on these borrowings during the term