Risk Management and Use of Derivative Financial Instruments (Details 6) (Cash Flow Hedging) In Thousands, unless otherwise specified	Sep. 30, 2014 USD ($)	Sep. 30, 2014 Forward contracts Euro USD ($) instrument	Sep. 30, 2014 Forward contracts Euro EUR (€)	Sep. 30, 2014 Forward contracts GBP USD ($) instrument	Sep. 30, 2014 Forward contracts GBP GBP (£)
Derivative Disclosure
Derivative number of instruments		72	72	17	17
Face Amount			€ 163,500		£ 9,100
Fair value, foreign currency derivatives	$ 3,178	$ 3,589		$ (411)