Disclosure about Fair Value of Financial Instruments (Details 1) - USD ($) $ in Thousands		Mar. 31, 2017		Dec. 31, 2016
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments		$ 17,330	[1]	$ 27,899
Foreign currency forward contracts	[2]	100,599
Redeemable OP unitholder interests		116,917
Totals		234,846
Level 1 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Available-for-sale equity investments	[1]	17,330
Totals		17,330
Level 2 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Foreign currency forward contracts	[2]	100,599
Redeemable OP unitholder interests		116,917
Totals		$ 217,516

[1] Unrealized gains or losses on equity investments are recorded in accumulated other comprehensive income (loss) at each measurement date.

[2] Please see Note 11 for additional information.