Risk Management and Use of Derivative Financial Instruments (Details 6) (Cash Flow Hedging) In Thousands, unless otherwise specified	Mar. 31, 2014 USD ($)	Mar. 31, 2014 Forward contracts Euro USD ($) instrument	Mar. 31, 2014 Forward contracts Euro EUR (€)	Mar. 31, 2014 Forward contracts GBP USD ($) instrument	Mar. 31, 2014 Forward contracts GBP GBP (£)
Derivative Disclosure
Derivative number of instruments		79	79	19	19
Notional Amount			€ 171,204		£ 10,773
Fair value, foreign currency derivatives	$ (12,893)	$ (12,008)		$ (885)