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

3 Months Ended

Sep. 30, 2012

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

Aggregate borrowings under the unsecured line of credit arrangements

		Three Months Ended September 30,				Nine Months Ended September 30,
		2012		2011		2012		2011
Balance outstanding at quarter end		$	0	$	390,000	$	0	$	390,000
Maximum amount outstanding at any month end		$	145,000	$	390,000	$	897,000	$	495,000
Average amount outstanding (total of daily
	principal balances divided by days in period)	$	165,000	$	140,978	$	255,639	$	152,832
Weighted average interest rate (actual interest
	expense divided by average borrowings outstanding)		2.30%		1.61%		1.79%		1.12%