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Borrowings Under Lines of Credit Facilities and Related Items (Tables)
 12 Months Ended
Dec. 31, 2018
Line of Credit Facility [Abstract]  
Aggregate borrowings under the unsecured lines of credit arrangements The following information relates to aggregate borrowings under the primary unsecured revolving credit facility for the periods presented (dollars in thousands):
 
 
Year Ended December 31,
 
 
2018
 
2017
 
2016
Balance outstanding at year end
 
$
1,147,000

 
$
719,000

 
$
645,000

Maximum amount outstanding at any month end
 
$
2,148,000

 
$
1,010,000

 
$
1,560,000

Average amount outstanding (total of daily principal balances
 
 
 
 
 
 
divided by days in period)
 
$
950,581

 
$
597,422

 
$
762,896

Weighted-average interest rate (actual interest expense divided
 
 
 
 
 
 
by average borrowings outstanding)
 
3.07
%
 
2.02
%
 
1.39
%