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Subsequent Events (Details) (USD $) In Millions, except Per Share data, unless otherwise specified				0 Months Ended	3 Months Ended				0 Months Ended				3 Months Ended			3 Months Ended	0 Months Ended	3 Months Ended	0 Months Ended			3 Months Ended		0 Months Ended
	May 12, 2014 property sqft	Apr. 22, 2014 sqft property	Mar. 31, 2014 sqft property	May 08, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Revolving Credit Facility [Member]	Mar. 31, 2014 Maximum [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 Minimum [Member] Revolving Credit Facility [Member]	Mar. 31, 2014 2014 Acquisition [Member] item sqft	May 08, 2014 Subsequent Event [Member] Revolving Credit Facility [Member]	May 08, 2014 Subsequent Event [Member] Maximum [Member] Revolving Credit Facility [Member]	May 08, 2014 Subsequent Event [Member] Minimum [Member] Revolving Credit Facility [Member]	Apr. 22, 2014 Subsequent Event [Member] 2014 Acquisition [Member]	Mar. 31, 2014 Common Stock [Member]	Mar. 31, 2014 Common Stock [Member] Subsequent Event [Member]	May 09, 2014 Common Stock [Member] Subsequent Event [Member]	Mar. 31, 2014 Preferred Stock [Member]	May 09, 2014 Preferred Stock [Member] Subsequent Event [Member]	Mar. 31, 2014 Preferred Stock [Member] Subsequent Event [Member]	May 08, 2014 Seven-Year $50.0 Million Term Loan [Member] Subsequent Event [Member]	May 08, 2014 Seven-Year $50.0 Million Term Loan [Member] Subsequent Event [Member] Maximum [Member]	May 08, 2014 Seven-Year $50.0 Million Term Loan [Member] Subsequent Event [Member] Minimum [Member]	Mar. 31, 2014 Five-Year $50.0 Million Term Loan [Member]	Mar. 31, 2014 Five-Year $50.0 Million Term Loan [Member] Revolving Credit Facility [Member]	May 08, 2014 Five-Year $50.0 Million Term Loan [Member] Subsequent Event [Member]	May 08, 2014 Five-Year $50.0 Million Term Loan [Member] Subsequent Event [Member] Maximum [Member] Revolving Credit Facility [Member]	May 08, 2014 Five-Year $50.0 Million Term Loan [Member] Subsequent Event [Member] Minimum [Member] Revolving Credit Facility [Member]
Subsequent Event [Line Items]
Number of buildings	5	1	99					3
Area of real estate property	494,726	19,326	7,100,000					318,822
Purchase price								$ 33.9				$ 3.5
Credit facility term loan																			7 years			5 years
Credit facility					100.0														50.0			50.0	150.0
Maturity date, line of credit					Jan. 01, 2016				May 07, 2018										May 07, 2021			Jan. 16, 2018		May 07, 2019
Extension option on maturity date			12 months						12 months
Maximum possible increase					$ 300.0				$ 500.0
Value of unencumbered properties				60.00%	60.00%
LIBOR margin					1.00%	2.65%	1.65%		1.25%											2.30%	1.75%				2.05%	1.50%
Effective rate					0.50%				0.50%
Unused facility fee rate						0.35%	0.25%			0.25%	0.20%
Declaration Date													Feb. 19, 2014	May 09, 2014		Feb. 19, 2014		May 09, 2014
Cash dividend declared, Common stock per share															$ 0.14
Cash dividend declared, Preferred stock series A																$ 0.484375	$ 0.484375
Date Paid													Apr. 21, 2014	Jul. 21, 2014		Mar. 31, 2014		Jun. 30, 2014
Record Date													Apr. 07, 2014	Jul. 07, 2014		Mar. 10, 2014		Jun. 11, 2014

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Amount of current borrowing capacity under the credit facility considering any current restrictions on the amount that could be borrowed (for example, borrowings may be limited by the amount of current assets), but without considering any amounts currently outstanding under the facility.

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