Basis of Presentation and Summary of Significant Accounting Policies (Details 3) (USD $) In Thousands	6 Months Ended
Jun. 30, 2011	Jun. 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)	269
Unrealized gains (losses) included in earnings	(24)	(23)
Realized gains (losses) included in earnings	0	0
Unrealized gains (losses) included in equity	746	(2,006)
Fair Value, Ending Balance	49,779	(3,625)
Available-for-sale Securities [Member] \| Fair Value, Inputs, Level 2 [Member]
Fair value of assets and liabilities measured on a recurring basis
Purchases	51,534
Investment accretion (see Note 4)	269
Realized gains (losses) included in earnings	0	0
Unrealized gains (losses) included in equity	1,573
Fair Value, Ending Balance	53,376
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	(24)	(23)
Realized gains (losses) included in earnings	0	0
Unrealized gains (losses) included in equity	(827)	(2,006)
Fair Value, Ending Balance	(3,597)	(3,625)
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	8,547	907
Realized gains (losses) included in earnings	0	0
Fair Value, Ending Balance	(10,995)	(23,400)
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	8,547	(907)
Realized gains (losses) included in earnings	0	0
Fair Value, Ending Balance	$ 10,995	$ 23,400

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 Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 12
-Subparagraph b

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Statement of Financial Accounting Standard (FAS)
-Number 115
-Paragraph 14

Reference 3: 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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