Borrowings Under Credit Facilities and Related Items (Tables)

6 Months Ended

Jun. 30, 2016

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

Aggregate borrowings under the unsecured line of credit arrangements

		Three Months Ended June 30,				Six Months Ended June 30,
		2016		2015		2016		2015
Balance outstanding at quarter end(1)		$	745,000	$	350,000	$	745,000	$	350,000
Maximum amount outstanding at any month end		$	745,000	$	535,000	$	945,000	$	535,000
Average amount outstanding (total of daily
	principal balances divided by days in period)	$	623,077	$	501,758	$	647,060	$	455,608
Weighted average interest rate (actual interest
	expense divided by average borrowings outstanding)		1.26%		1.13%		1.28%		1.17%
(1) As of June 30, 2016, letters of credit in the aggregate amount of $48,930,000 have been issued, which reduces the borrowing capacity on the unsecured revolving credit facility.