Disclosure about Fair Value of Financial Instruments (Details 1) (USD $)	Dec. 31, 2014		Dec. 31, 2013
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Foreign currency forward contract	$ 55,592,000	[1]	$ 11,637,000
Interest Rate Derivative Liabilities, at Fair Value	0		0
Interest rate swap agreements, Carrying Amount	0		0
Redeemable OP Unit holder Interests	46,722,000
Total	102,314,000
Level 1 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Foreign currency forward contract	0
Interest rate swap agreements, Carrying Amount	0
Total	0
Level 2 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Foreign currency forward contract	55,592,000	[1]
Redeemable OP Unit holder Interests	46,722,000
Total	102,314,000
Level 3 [Member]
The Market approach utilized to measure fair value of financial assets and liabilities on recurring basis
Foreign currency forward contract	0
Interest rate swap agreements, Carrying Amount	0
Total	$ 0

[1] (1) Please see Note 11 for additional information.