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Borrowings Under Lines of Credit Arrangements and Related Items (Tables)
 12 Months Ended
Dec. 31, 2014
Borrowings Under Line of Credit Arrangement and Related Items (Tables) [Abstract]  
Aggregate borrowings under the unsecured lines of credit arrangements

The following information relates to aggregate borrowings under our primary unsecured credit facility for the periods presented (dollars in thousands):

Year Ended December 31,
201420132012
Balance outstanding at year end(1)$-$130,000$-
Maximum amount outstanding at any month end$637,000$1,019,050$897,000
Average amount outstanding (total of daily
principal balances divided by days in period)$207,452$488,842$191,378
Weighted-average interest rate (actual interest
expense divided by average borrowings outstanding)1.50%1.45%1.80%
(1) As of December 31, 2014, letters of credit in the aggregate amount of $71,276,000 have been issued which reduce the available borrowing capacity on the primary unsecured credit facility.