Acquisitions (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended					6 Months Ended	12 Months Ended
	Jun. 30, 2013 Number sqft acre		Mar. 31, 2013 sqft acre Number		Dec. 31, 2012 Number acre sqft	Jun. 30, 2013 Number acre sqft	Dec. 31, 2012 sqft acre Number
Business Acquisition Number Of Buildings	14		3		2	17	2
Area Of Land Acquired	664,800		981,000		539,000	1,645,800	539,000
Number of Acres acquired	301		79		34	380	34
Business Acquisition Purchase Price	$ 111,220		$ 47,000		$ 27,125	$ 158,220	$ 27,125
Business Acquisition Lease Expiration Date							Jul. 31, 2024
Warehouse [Member]
Business Acquisition Location			Olive Branch Mississippi	[1]
Business Acquisition Metropolitan Statistical Area			Memphis Tennessee	[1]
Business Acquisition, Effective Date of Acquisition			Mar. 11, 2013	[1]
Business Acquisition Number Of Buildings			1	[1]
Area Of Land Acquired			605,000	[1]
Number of Acres acquired			43	[1]
Business Acquisition Purchase Price			24,650	[1]
Business Acquisition Lease Expiration Date			Dec. 01, 2022	[1]
Industrial Property [Member]
Business Acquisition Location			Garland Texas	[1]	Mt. Comfort Indiana
Business Acquisition Metropolitan Statistical Area			Dallas Texas	[1]	Indianapolis Indiana
Business Acquisition, Effective Date of Acquisition			Mar. 19, 2013	[1]	Nov. 20, 2012
Business Acquisition Number Of Buildings			1	[1]	1
Area Of Land Acquired			342,000	[1]	294,000
Number of Acres acquired			20	[1]			13
Business Acquisition Purchase Price			10,700	[1]	12,035
Business Acquisition Lease Expiration Date			Oct. 01, 2032	[1]			Sep. 30, 2021
Cross Dock Truck Terminal One [Member]
Business Acquisition Location			East Brunswick New Jersey	[1]
Business Acquisition Metropolitan Statistical Area			New York New York	[1]
Business Acquisition, Effective Date of Acquisition			Mar. 28, 2013	[1]
Business Acquisition Number Of Buildings			1	[1]
Area Of Land Acquired			34,000	[1]
Number of Acres acquired			16	[1]
Business Acquisition Purchase Price			11,650	[1]
Business Acquisition Lease Expiration Date			Jan. 01, 2019	[1]
Cross Dock Truck Terminal Two [Member]
Business Acquisition Location	Atlanta Georgia	[1]
Business Acquisition Metropolitan Statistical Area	Atlanta Georgia	[1]
Business Acquisition, Effective Date of Acquisition	May 06, 2013	[1]
Business Acquisition Number Of Buildings	1	[1]
Area Of Land Acquired	130,000	[1]
Number of Acres acquired	38	[1]
Business Acquisition Purchase Price	7,850	[1]
Business Acquisition Lease Expiration Date	May 01, 2020	[1]
Cross Dock Truck Terminal Three [Member]
Business Acquisition Location	Deer Park New York	[2]
Business Acquisition Metropolitan Statistical Area	New York New York	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 18, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	18,000	[2]
Number of Acres acquired	5	[2]
Business Acquisition Purchase Price	3,900	[2]
Business Acquisition Lease Expiration Date	Dec. 01, 2019	[2]
Industrial Property One [Member]
Business Acquisition Location	Bellmawr New Jersey	[1]			Greenwood Indiana
Business Acquisition Metropolitan Statistical Area	Philadelphia Pennsylvania	[1]			Indianapolis Indiana
Business Acquisition, Effective Date of Acquisition	May 30, 2013	[1]			Nov. 20, 2012
Business Acquisition Number Of Buildings	1	[1]			1
Area Of Land Acquired	62,000	[1]			245,000
Number of Acres acquired	4	[1]					21
Business Acquisition Purchase Price	4,175	[1]			15,090
Business Acquisition Lease Expiration Date	Oct. 01, 2020	[1]					Dec. 31, 2018
Bank Branch One [Member]
Business Acquisition Location	Emmaus Pennsylvania	[2]
Business Acquisition Metropolitan Statistical Area	Allentown Pennsylvania	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 06, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	4,800	[2]
Number of Acres acquired	0	[2]
Business Acquisition Purchase Price	1,610	[2]
Business Acquisition Lease Expiration Date	Feb. 01, 2019	[2]
Bank Branch Two [Member]
Business Acquisition Location	Calabash North Carolina	[2]
Business Acquisition Metropolitan Statistical Area	Wilmington North Carolina	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 06, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	2,000	[2]
Number of Acres acquired	0	[2]
Business Acquisition Purchase Price	610	[2]
Business Acquisition Lease Expiration Date	Dec. 01, 2018	[2]
Cross Dock Truck Terminal Four [Member]
Business Acquisition Location	Elkridge Maryland	[2]
Business Acquisition Metropolitan Statistical Area	Baltimore Maryland	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 19, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	34,000	[2]
Number of Acres acquired	11	[2]
Business Acquisition Purchase Price	5,900	[2]
Business Acquisition Lease Expiration Date	May 01, 2019	[2]
Cross Dock Truck Terminal Five [Member]
Business Acquisition Location	Houston Texas	[2]
Business Acquisition Metropolitan Statistical Area	Houston Texas	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 26, 2013	[2]
Business Acquisition Number Of Buildings	3	[2]
Area Of Land Acquired	102,000	[2]
Number of Acres acquired	33	[2]
Business Acquisition Purchase Price	6,914	[2]
Business Acquisition Lease Expiration Date	May 01, 2019	[2]
Cross Dock Truck Terminal Six [Member]
Business Acquisition Location	Orlando Florida	[2]
Business Acquisition Metropolitan Statistical Area	Orlando Florida	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 26, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	46,000	[2]
Number of Acres acquired	15	[2]
Business Acquisition Purchase Price	5,036	[2]
Business Acquisition Lease Expiration Date	Jan. 01, 2019	[2]
Specialty Asset Type [Member]
Business Acquisition Location	Hutchins Texas	[2],[3]
Business Acquisition Metropolitan Statistical Area	Dallas Texas	[2],[3]
Business Acquisition, Effective Date of Acquisition	Jun. 27, 2013	[2],[3]
Business Acquisition Number Of Buildings	3	[2],[3]
Area Of Land Acquired	196,000	[2],[3]
Number of Acres acquired	175	[2],[3]
Business Acquisition Purchase Price	58,500	[2],[3]
Business Acquisition Lease Expiration Date	Jul. 01, 2029	[2],[3]
Warehouse One [Member]
Business Acquisition Location	Logan Twp. New Jersey	[2]
Business Acquisition Metropolitan Statistical Area	Philadelphia Pennsylvania	[2]
Business Acquisition, Effective Date of Acquisition	Jun. 28, 2013	[2]
Business Acquisition Number Of Buildings	1	[2]
Area Of Land Acquired	70,000	[2]
Number of Acres acquired	11	[2]
Business Acquisition Purchase Price	11,725	[2]
Business Acquisition Lease Expiration Date	May 01, 2028	[2]
Build To Suit [Member]
Business Acquisition Location	Hialeah Gardens Florida	[1],[4]
Business Acquisition Metropolitan Statistical Area	Miami Florida	[1],[4]
Business Acquisition, Effective Date of Acquisition	May 30, 2013	[1],[4]
Business Acquisition Number Of Buildings	0	[1],[4]
Area Of Land Acquired	0	[1],[4]
Number of Acres acquired	9	[1],[4]
Business Acquisition Purchase Price	$ 5,000	[1],[4]

[1] The Company analyzed the fair value of the leases and real estate assets of these investments; and, accordingly, the purchase price allocation is finalized. The current allocation of the assets includes $50,272 of net real estate assets, $9,730 of intangible assets and $3,679 of intangible liabilities. The Company had measurement period adjustments for the acquisitions that were completed in first quarter of 2013, but where the purchase price allocation was completed in the second quarter, resulting in a reallocation of $4,207 in net intangible assets and liabilities from real estate assets.

[2] The Company is currently analyzing the fair value of the lease and real estate assets; and accordingly, the purchase price allocation is preliminary and subject to change. The initial recording of the assets included $97,200 of real estate assets.

[3] The Specialty Asset located in Hutchins, Texas is an auto auction facility encumbered with a mortgage of $26,322, with a fair value of $29,385, and capitalized loan assumption costs of $263.

[4] The build-to-suit property located in Hialeah Gardens, Florida is a commitment to construct a 120,000 square foot cold storage facility which will be 100% leased for an initial term of 25 years when completed in the second quarter of 2014. The Company acquired the land for the property with a $4,990 zero-coupon mortgage note payable to the seller. Total costs are expected to be approximately $25,000, of which the unfunded amounts were estimated to be $23,158 at June 30, 2013.