Borrowings Under Credit Facilities and Related Items (Tables)

9 Months Ended

Sep. 30, 2017

Borrowings Under Credit Facilities and Related Items (Tables) [Abstract]

Aggregate borrowings under the unsecured line of credit arrangements

		Three Months Ended September 30,				Nine Months Ended September 30,
		2017		2016		2017		2016
Balance outstanding at quarter end(1)		$	420,000	$	1,350,000	$	420,000	$	1,350,000
Maximum amount outstanding at any month end		$	645,000	$	1,560,000	$	1,010,000	$	1,560,000
Average amount outstanding (total of daily
	principal balances divided by days in period)	$	450,130	$	1,050,217	$	601,436	$	782,427
Weighted average interest rate (actual interest
	expense divided by average borrowings outstanding)		2.19%		1.44%		1.95%		1.35%
(1) As of September 30, 2017, letters of credit in the aggregate amount of $25,576,000 have been issued, which reduces the borrowing capacity on the unsecured revolving credit facility.