Equity Investments in Real Estate (Details 1) (USD $) In Thousands, unless otherwise specified	Jun. 30, 2013	Dec. 31, 2012
Ownership interest in equity investments:
Equity investments in real estate	$ 320,355	$ 275,133
C1000 Logistiek Vastgooed B.V
Ownership interest in equity investments:
Ownership interest, percentage	85.00%
Equity investments in real estate	79,784	81,516
Uhaul Moving Partners Inc And Mercury Partners LP
Ownership interest in equity investments:
Ownership interest, percentage	12.00%
Equity investments in real estate	27,581	28,019
Berry Plastics Corporation
Ownership interest in equity investments:
Ownership interest, percentage	50.00%
Equity investments in real estate	18,084	18,529
Tesco plc
Ownership interest in equity investments:
Ownership interest, percentage	49.00%
Equity investments in real estate	16,981	17,487
Hellweg Die Profi Baumarkt Gmbh And Co KG
Ownership interest in equity investments:
Ownership interest, percentage	33.00%
Equity investments in real estate	21,399	22,827
Eroski Sociedad Cooperativa Mallorca
Ownership interest in equity investments:
Ownership interest, percentage	30.00%
Equity investments in real estate	9,237	9,336
Dicks Sporting Goods Inc
Ownership interest in equity investments:
Ownership interest, percentage	45.00%
Equity investments in real estate	4,815	5,010
BPS Partners, LLC
Ownership interest in equity investments:
Ownership interest, percentage	15.00%
Equity investments in real estate	26,600	26,253
Madison Self Storage
Ownership interest in equity investments:
Ownership interest, percentage	85.00%
Equity investments in real estate	23,067	0
Shelborne
Ownership interest in equity investments:
Equity investments in real estate	86,931	63,896
I-Drive Live
Ownership interest in equity investments:
Equity investments in real estate	$ 5,876	$ 2,260