Notes Payable (Tables)

12 Months Ended

Dec. 31, 2018

Debt Disclosure [Abstract]

Components of Notes Payable

Notes payable consists of the following:

(in thousands)	December 31,
	2018			2017
Unsecured revolving lines of credit	$	198,603		$	183,473
4.03% Series A senior notes due in 2018		—			20,000
3.68% Series B senior notes due in 2021		40,000			40,000
3.84% Series C senior notes due in 2022		60,000			60,000
		298,603			303,473
Unamortized debt issuance cost		(39	)		(59	)
	$	298,564		$	303,414

Schedule of Future Minimum Payments under Unsecured Revolving Lines of Credit and 4.03% Senior Notes, 3.68% Senior Notes and 3.84% Senior Notes

As of December 31, 2018, the future minimum payments under the unsecured revolving lines of credit, 3.68% Series B senior notes due in 2021 and 3.84% Series C senior notes due in 2022 are as follows:

(in thousands)
Year Ended December 31,
2019	$	—
2020		—
2021		238,603
2022		60,000
	$	298,603

Schedule of Information Related to Lines of Credit

The following information relates to the lines of credit for each of the following periods:

(dollar amounts in thousands)	Year Ended December 31,
	2018			2017
Maximum amount outstanding	$	228,500		$	215,732
Average amount outstanding	$	204,534		$	199,499
Weighted average interest rate, during the period		3.36	%		2.64	%
Prime interest rate, end of period		5.50	%		4.50	%