Borrowings Under Line of Credit Arrangement and Related Items (Tables)

6 Months Ended

Jun. 30, 2011

Borrowings Under Line of Credit Arrangement and Related Items (Tables) [Abstract]

Aggregate borrowings under the unsecured line of credit arrangement

	Three Months Ended June 30,					Six Months Ended June 30,
	2011		2010			2011			2010
Balance outstanding at quarter end	$	—	$	206,000		$	—		$	206,000
Maximum amount outstanding at any month end	$	20,000	$	431,000		$	495,000		$	431,000
Average amount outstanding (total of daily principal balances divided by days in period)	$	253	$	293,505		$	158,856		$	288,337
Weighted average interest rate (actual interest expense divided by average borrowings outstanding)		n/a		1.63	%		2.17	%		1.55	%