Indebtedness (Tables)

12 Months Ended

Dec. 31, 2017

Debt Disclosure [Abstract]

Schedule of Outstanding Indebtedness

At December 31, 2017 and 2016, our outstanding indebtedness included the following (in thousands):

					December 31,
	Interest Rate at December 31, 2017			Maturity Date	2017			2016
Unsecured revolving credit facility, at LIBOR plus a premium	2.61	%		1/28/2019	$	—		$	—
5-year unsecured term loan, at LIBOR plus a premium	2.71	%		1/28/2020	200,000			200,000
7-year unsecured term loan, at LIBOR plus a premium	3.11	%		1/28/2022	200,000			200,000
Unsecured floating rate debt	2.91	%	(1)		$	400,000		$	400,000
6.65% Senior Unsecured Notes due 2018	—	%		—	$	—		$	250,000
5.875% Senior Unsecured Notes due 2020	5.875	%		9/15/2020	250,000			250,000
5.75% Senior Unsecured Notes due 2042(2)	5.75	%		8/1/2042	175,000			175,000
Unsecured fixed rate debt	5.82	%	(1)		$	425,000		$	675,000
Parkshore Plaza	—	%		—	$	—		$	41,275
206 East 9th Street	5.69	%		1/5/2021	26,536			27,041
33 Stiles Lane	—	%		—	—			2,415
97 Newberry Road	5.71	%		3/1/2026	5,404			5,903
Secured fixed rate debt	5.69	%	(1)		$	31,940		$	76,634
					$	856,940		$	1,151,634
Unamortized net premiums, discounts and deferred financing fees					(8,362		)	(9,967		)
					$	848,578		$	1,141,667

(1) Represents weighted average interest rate at December 31, 2017.

(2) On January 30, 2018, we delivered notice of our intent to redeem at par our $175 million5.75% senior unsecured notes due 2042 on March 7, 2018. The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.

Schedule of Required Principal Payments on Outstanding Debt

The required principal payments due during the next five years and thereafter under all of our outstanding debt at December 31, 2017 are as follows (in thousands):

2018	$	1,063
2019	1,126
2020	451,189
2021	25,463
2022	200,663
Thereafter(1)	177,436
	$	856,940

(1) On January 30, 2018, we delivered notice of our intent to redeem at par our $175 million5.75% senior unsecured notes due 2042 on March 7, 2018. The notes will be redeemed for cash at a price equal to 100% of the principal amount of the notes plus any accrued and unpaid interest up to, but excluding, the redemption date.