Fair Value Measurements (Details) (USD $) In Thousands	9 Months Ended
Sep. 30, 2011	Sep. 30, 2010
Fair value of assets and liabilities measured on a recurring basis
Fair Value, Beginning Balance	$ (2,746)	$ (1,596)
Purchases	51,534
Investment accretion (see Note 4)	939
Unrealized gains (losses) included in earnings	(36)	(35)
Realized gains (losses) included in earnings
Unrealized gains (losses) included in equity	(7,242)	(3,806)
Fair Value, Ending Balance	42,499	(5,437)
Available-for-sale Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis
Fair Value, Beginning Balance	0	0
Purchases	51,534
Investment accretion (see Note 4)	939
Realized gains (losses) included in earnings
Unrealized gains (losses) included in equity	(3,428)
Fair Value, Ending Balance	49,045	0
Interest Rate Swap [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis
Fair Value, Beginning Balance	(2,746)	(1,596)
Unrealized gains (losses) included in earnings	(36)	(35)
Realized gains (losses) included in earnings
Unrealized gains (losses) included in equity	(3,814)	(3,806)
Fair Value, Ending Balance	(6,596)	(5,437)
Total rate of return swaps [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis
Fair Value, Beginning Balance	(19,542)	(24,307)
Unrealized gains (losses) included in earnings	11,772	5,771
Realized gains (losses) included in earnings
Fair Value, Ending Balance	(7,770)	(18,536)
Total rate of return debt [Member] \| Fair Value, Inputs, Level 3 [Member]
Fair value of assets and liabilities measured on a recurring basis
Fair Value, Beginning Balance	19,452	24,307
Unrealized gains (losses) included in earnings	(11,772)	(5,771)
Realized gains (losses) included in earnings
Fair Value, Ending Balance	$ 7,770	$ 18,536

This element represents a certain statement of financial position asset or liability caption which represents a class of assets or liabilities, or which may include an individual asset or liability, measured at fair value on a recurring basis.

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- Definition

Fair Value, Assets and Liabilities Measured on Recurring Basis Fair value and input reconciliation.

+ Details

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- Definition

Fair Value Assets And Liabilities Measured On Recurring Basis Purchases.

+ Details

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- Definition

Fair Value Assets And Liabilities Measured On Recurring Basis Realized Gain Loss Included In Earnings.

+ Details

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- Definition

This item represents the amount of the total unrealized gains or losses for the period which are included in the statement of income; the fair value of which assets and liabilities was or is measured on a recurring basis using significant observable inputs (Level 2) or significant unobservable inputs (Level 3).

+ Details

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- Definition

This item represents the amount of the total unrealized gains or losses for the period which are reflected as an adjustment of equity; the fair value of which assets and liabilities was or is measured on a recurring basis using significant observable inputs (Level 2) or significant unobservable inputs (Level 3).

+ Details

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- Definition

Interest income on securities classified neither as held-to-maturity nor trading ("available-for-sale securities") includes: (a) interest and dividends earned on all securities and (b) amortization and accretion (as applicable) of discounts and premiums, if any.

+ References

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

-Publisher FASB

-Name Accounting Standards Codification

-Glossary Available-for-Sale Securities

-URI http://asc.fasb.org/extlink&oid=6505594

Reference 2: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 942

-SubTopic 225

-Section S99

-Paragraph 1

-Subparagraph (SX 210.9-04.2)

-URI http://asc.fasb.org/extlink&oid=6879574&loc=d3e536633-122882

Reference 3: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 12

-Subparagraph b

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 4: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Accounting Standards Codification

-Topic 320

-SubTopic 10

-Section 35

-Paragraph 4

-URI http://asc.fasb.org/extlink&oid=6956420&loc=d3e24721-111560

Reference 5: http://www.xbrl.org/2003/role/presentationRef

-Publisher FASB

-Name Statement of Financial Accounting Standard (FAS)

-Number 115

-Paragraph 14

-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.

Reference 6: http://www.xbrl.org/2003/role/presentationRef

-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 04

-Paragraph 2

-Article 9

+ Details

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