The amount of net gains or losses on a cash flow hedge reclassified in the period to earnings from accumulated other comprehensive income.

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Fixed interest rate related to the interest rate derivative.

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The net gain (loss) recognized in earnings during the period due to the ineffectiveness on interest rate fair value hedges.

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Fair value as of the balance sheet date of all derivative assets designated as interest rate fair value hedging instruments.

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Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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The cash outflow to repay long-term debt that is not secured by collateral. Excludes repayments of tax exempt unsecured debt.

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Derivative Financial Instruments (Narrative) (Details) (USD $)	12 Months Ended			0 Months Ended					12 Months Ended		0 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Oct. 04, 2011 Bank Of America [Member]	Oct. 04, 2011 Union Bank [Member]	Dec. 31, 2011 Loans [Member] Interest Rate Swaps Agreements [Member]	Dec. 31, 2010 Loans [Member] Interest Rate Swaps Agreements [Member]	Mar. 03, 2008 Loans [Member] Interest Rate Swaps Agreements [Member]	Dec. 31, 2011 Senior Notes [Member]	Jan. 02, 2002 Senior Notes [Member] Interest Rate Swaps Agreements [Member]	Feb. 06, 2009 Credit Facility [Member] Interest Rate Swaps Agreements [Member]
Derivative [Line Items]
Secured notes								$ 18,000,000			$ 120,000,000
Unsecured note										125,000,000
Fixed rate								4.25%			1.93%
Senior notes retired	125,000,000	0	0						125,000,000
Maturity date of senior notes									August 15, 2011		January 3, 2012
Unsecured senior notes interest rate									7.25%
Loan maximum borrowing capacity				18,000,000	20,000,000
Basis spread on variable rate				50.00%	40.00%					107.00%
Loan expiration date				March 1, 2013	January 2, 2015
Fair market value of the interest rate swap						700,000	1,100,000
Amount of ineffectiveness recorded in earnings	0
Gains or losses on derivative instruments designated as cash flow hedges reclassified from accumulated other comprehensive income into earnings	$ 1,000,000	$ 0	$ 0