Borrowings Under Credit Facilities and Commercial Paper Program (Tables)

6 Months Ended

Jun. 30, 2019

Debt Disclosure [Abstract]

Aggregate Borrowings Under Unsecured Revolving Credit Facility and Commercial Paper

The following information relates to aggregate borrowings under the unsecured revolving credit facility and Commercial Paper Program for the periods presented (dollars in thousands): 

	Three Months Ended						Six Months Ended
	June 30,						June 30,
	2019			2018			2019			2018
Balance outstanding at quarter end	$	1,870,000		$	540,000		$	1,870,000		$	540,000
Maximum amount outstanding at any month end	$	2,880,000		$	685,000		$	2,880,000		$	865,000
Average amount outstanding (total of daily
principal balances divided by days in period)	$	1,807,631		$	562,747		$	1,301,883		$	463,978
Weighted average interest rate (actual interest
expense divided by average borrowings outstanding)	3.08		%	3.04		%	3.11		%	2.91		%