Indebtedness (Tables)

12 Months Ended

Dec. 31, 2016

Debt Disclosure [Abstract]

Schedule of additional outstanding debt

At December 31, 2016 and 2015, our outstanding senior unsecured notes and secured debt consisted of the following:

				December 31, 2016				December 31, 2015
Senior Unsecured Notes	Coupon		Maturity	Face Amount		Unamortized Discount		Face Amount		Unamortized Discount
Senior unsecured notes	3.250	%	2019	$	400,000	$	138	$	400,000	$	197
Senior unsecured notes	6.750	%	2020	200,000		703		200,000		918
Senior unsecured notes	6.750	%	2021	300,000		2,627		300,000		3,161
Senior unsecured notes	4.750	%	2024	250,000		579		250,000		658
Senior unsecured notes	5.625	%	2042	350,000		—		350,000		—
Senior unsecured notes	6.250	%	2046	250,000		—		—		—
Total senior unsecured notes				$	1,750,000	$	4,047	$	1,500,000	$	4,934

Schedule of secured and other debt

	Principal Balance as of							Number of Properties as Collateral	Net Book Value of Collateral as of
	December 31,								December 31,
Secured and Other Debt	2016(1)		2015(1)		Interest Rate		Maturity	At December 31, 2016	2016		2015
Mortgage(2)	$	—	$	6,115	5.97	%	Apr 16	—	$	—	$	9,291
Mortgage(2)	—		18,000		4.65	%	Jul 16	—	—		36,783
Mortgages(2)	—		82,070		5.92	%	Nov 16	—	—		146,236
Mortgage(2)	—		11,989		6.25	%	Nov 16	—	—		20,700
Mortgage(2)	—		5,524		5.86	%	Mar 17	—	—		10,710
Mortgages(2)	—		43,549		6.54	%	May 17	—	—		52,561
Mortgage	10,653		10,861		6.15	%	Aug 17	1	14,162		14,487
Mortgage	8,686		8,948		6.73	%	Apr 18	1	10,656		10,891
Mortgages	12,772		12,976		6.31	%	Oct 18	1	16,827		17,184
Mortgage	12,061		12,250		6.24	%	Oct 18	1	15,453		15,798
Mortgages	69,953		72,062		4.47	%	Oct 18	10	180,933		185,666
Mortgage	6,565		6,692		4.69	%	Jan 19	1	9,687		9,952
Mortgages	44,462		45,327		3.79	%	Jul 19	4	64,154		65,551
Mortgage	279,505		284,138		6.71	%	Sep 19	17	235,068		238,488
Mortgages	3,128		3,616		7.49	%	Jan 22	1	15,360		15,775
Mortgage	14,300		14,825		6.28	%	Jul 22	1	24,834		25,371
Mortgage	11,594		11,787		4.85	%	Oct 22	1	21,529		21,992
Mortgages(3)	620,000		—		3.53	%	Aug 26	1	785,805		—
Mortgage	2,819		3,246		6.25	%	Feb 33	1	4,267		4,374
Mortgage	8,882		9,047		5.95	%	Aug 37	1	8,656		8,650
Mortgage	4,427		4,512		4.38	%	Sep 43	1	7,202		7,305
Capital Leases	11,466		12,156		7.70	%	Apr 26	2	18,968		19,400
Total secured and other debt	$	1,121,273	$	679,690				45	$	1,433,561	$	937,165

(1) The principal balances are the amounts stated in the contracts. In accordance with GAAP, our carrying values and recorded interest expense may be different because of market conditions at the time we assumed certain of these debts. As of December 31, 2016 and 2015, the unamortized net premiums and debt issuance costs on certain of these mortgages were $3,624 and $395, respectively.

(2) In 2016, we repaid these debts.

(3) In July 2016, we entered into loan agreements and obtained an aggregate $620,000 secured debt financing that matures in August 2026. These loans are secured by one MOB (two buildings).

Schedule of required principal payments on outstanding debt

Required principal payments on our outstanding debt as of December 31, 2016, are as follows:

2017	$	22,085
2018	$	436,768
2019	$	720,919
2020	$	553,080
2021	$	303,327
Thereafter	$	1,712,094