CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) shares in Thousands, $ in Thousands	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
REVENUES:
Rental income	$ 97,860	$ 80,478
Tenant reimbursements and other income	19,372	13,937
Total revenues	117,232	94,415
EXPENSES:
Real estate taxes	10,288	8,357
Other operating expenses	12,958	9,007
Depreciation and amortization	33,469	24,719
Acquisition related costs	58	20,539
General and administrative	6,976	6,792
Total expenses	63,749	69,414
Operating income	53,483	25,001
Interest expense (including net amortization of debt premiums and discounts and debt issuance costs of $1,374 and $1,171, respectively)	(20,609)	(14,179)
Loss on early extinguishment of debt		(6,845)
Income before income tax expense and equity in earnings of an investee	32,874	3,977
Income tax expense	(139)	(31)
Equity in earnings of an investee	77	72
Net income	32,812	4,018
Net income allocated to noncontrolling interest	(33)	(41)
Net income attributed to SIR	32,779	3,977
Other comprehensive income (loss):
Unrealized gain on investment in available for sale securities	16,821
Unrealized (loss) gain on interest rate swap	(902)	218
Equity in unrealized gain of an investee	52	45
Other comprehensive income	15,971	263
Comprehensive income	48,783	4,281
Comprehensive income allocated to noncontrolling interest	(33)	(41)
Comprehensive income attributed to SIR	$ 48,750	$ 4,240
Weighted average common shares outstanding, basic (in shares)	89,286	79,489
Weighted average common shares outstanding, diluted (in shares)	89,295	79,498
Basic and diluted net income attributed to SIR per common share (in dollars per share)	$ 0.37	$ 0.05