Risk Management and Use of Derivative Financial Instruments (Details 6) (Cash Flow Hedging) In Thousands, unless otherwise specified	Jun. 30, 2014 USD ($)	Jun. 30, 2014 Forward contracts Euro USD ($) instrument	Jun. 30, 2014 Forward contracts Euro EUR (€)	Jun. 30, 2014 Forward contracts GBP USD ($) instrument	Jun. 30, 2014 Forward contracts GBP GBP (£)
Derivative Disclosure
Derivative number of instruments		76	76	18	18
Notional Amount			€ 170,435		£ 9,630
Fair value, foreign currency derivatives	$ (12,506)	$ (11,376)		$ (1,130)