Fair Value Measurement With Unobservable Inputs Reconciliation Recurring Basis Liabilities Value.

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from assets measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

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- Definition

This element represents purchases, sales, issuances, and settlements (net) which have taken place during the period in relation to assets measured at fair value on a recurring basis using unobservable inputs (Level 3).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

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- Definition

This element represents [net] transfers in to and out of assets measured at fair value on a recurring basis using unobservable inputs (Level 3) which have taken place during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

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- Definition

This element represents an asset measured at fair value using significant unobservable inputs (Level 3) which is required for reconciliation purposes of beginning and ending balances.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in earnings or resulted in a change in net asset value.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

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- Definition

This element represents total gains or losses for the period (realized and unrealized), arising from liabilities measured at fair value on a recurring basis using unobservable inputs (Level 3), which are included in other comprehensive income (a separate component of shareholders' equity.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 157

-Paragraph 32

-Subparagraph c(1)

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Fair Value Measurements (Details 1) (USD $) In Thousands	3 Months Ended													3 Months Ended
Fair Value Measurements (Details 1) (USD $) In Thousands	Sep. 30, 2011 Interest rate derivatives [Member]	Jun. 30, 2011 Interest rate derivatives [Member]	Mar. 31, 2011 Interest rate derivatives [Member]	Sep. 30, 2010 Interest rate derivatives [Member]	Jun. 30, 2010 Interest rate derivatives [Member]	Mar. 31, 2010 Interest rate derivatives [Member]	Jun. 30, 2010 Convertible preferred securities [Member]	Sep. 30, 2011 Convertible preferred securities [Member]	Jun. 30, 2011 Convertible preferred securities [Member]	Mar. 31, 2011 Convertible preferred securities [Member]	Dec. 31, 2010 Convertible preferred securities [Member]	Sep. 30, 2010 Convertible preferred securities [Member]	Dec. 31, 2009 Convertible preferred securities [Member]	Sep. 30, 2011 Commodity derivatives, net [Member]	Jun. 30, 2011 Commodity derivatives, net [Member]	Mar. 31, 2011 Commodity derivatives, net [Member]	Sep. 30, 2010 Commodity derivatives, net [Member]	Jun. 30, 2010 Commodity derivatives, net [Member]	Mar. 31, 2010 Commodity derivatives, net [Member]
Beginning and ending balances for the Company's fair value measurements using Level 3 inputs
Liability, Beginning Balance	$ (1,883)	$ (1,502)	$ (2,156)	$ (2,277)	$ (1,925)	$ (1,763)
Asset, Beginning Balance							0	15,790	15,790	15,790	15,790	13,100	0	8,794	14,983	12,406	7	22	1,948
Losses included in earnings	(234)	(310)	(2)	(54)	(99)	(72)
Gains included in earnings														(5,581)	(6,398)	77	589	(15)	(1,926)
Unrealized losses included in other comprehensive income	(165)	(120)	149	(284)	(253)	(126)
New contracts entered into	44	49	507			36	13,100
Transfers from level 2														70	209	2,500	626
Liability, Ending Balance	(2,238)	(1,883)	(1,502)	(2,615)	(2,277)	(1,925)
Asset, Ending Balance							$ 13,100	$ 15,790	$ 15,790	$ 15,790	$ 15,790	$ 13,100	$ 0	$ 3,283	$ 8,794	$ 14,983	$ 1,222	$ 7	$ 22