Consolidated Statements of Operations (Unaudited) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Revenues
Rental income	$ 83,487	$ 74,394	$ 162,373	$ 144,347
Other operating income	7,239	6,050	13,761	11,555
Total operating revenues	90,726	80,444	176,134	155,902
Expenses
Property operations and maintenance	19,486	17,993	40,046	36,478
Real estate taxes	9,145	8,055	18,064	16,121
General and administrative	9,686	8,864	19,092	17,400
Acquisition costs	788	1,938	1,369	4,716
Operating leases of storage facilities		1,997	683	3,994
Depreciation and amortization	14,584	12,481	28,766	24,423
Total operating expenses	53,689	51,328	108,020	103,132
Income from operations	37,037	29,116	68,114	52,770
Other income (expenses)
Interest expense	(9,216)	(8,872)	(18,377)	(16,216)
Interest income	2	24	4	31
Loss on sale of storage facility			(7)
Equity in income of joint ventures	853	433	1,499	892
Net income	28,676	20,701	51,233	37,477
Net income attributable to noncontrolling interest	(144)	(125)	(250)	(228)
Net income attributable to common shareholders	$ 28,532	$ 20,576	$ 50,983	$ 37,249
Earnings per common share attributable to common shareholders - basic	$ 0.81	$ 0.63	$ 1.46	$ 1.14
Earnings per common share attributable to common shareholders - diluted	$ 0.80	$ 0.62	$ 1.45	$ 1.14
Common shares used in basic earnings per share calculation	35,377,694	32,799,837	34,853,731	32,591,917
Common shares used in diluted earnings per share calculation	35,603,020	32,979,708	35,078,946	32,759,069
Dividends declared per common share	$ 0.75	$ 0.68	$ 1.50	$ 1.36