Disclosure about Fair Value of Financial Instruments (Details 1) - USD ($) $ in Thousands		Mar. 31, 2018	Dec. 31, 2017
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments		$ 14,443	$ 7,269
Foreign currency forward contracts	[1]	(29,477)
Redeemable OP unitholder interests		97,476
Totals		82,442
Level 1 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments		14,443
Foreign currency forward contracts	[1]	0
Redeemable OP unitholder interests		0
Totals		14,443
Level 2 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments		0
Foreign currency forward contracts	[1]	(29,477)
Redeemable OP unitholder interests		97,476
Totals		67,999
Level 3 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments		0
Foreign currency forward contracts	[1]	0
Redeemable OP unitholder interests		0
Totals		$ 0

[1] Please see Note 11 for additional information.