Risk Management and Use of Derivative Financial Instruments (Details 7) In Thousands, unless otherwise specified	Dec. 31, 2013 USD ($)	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency collars Euro USD ($) instrument	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency collars Euro EUR (€)	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency contract Euro USD ($) instrument	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency contract Euro EUR (€)	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency contract Yen USD ($) instrument	Dec. 31, 2013 Designated as hedging Cash Flow Hedging Foreign currency contract Yen JPY (¥)	Dec. 31, 2013 Designated as hedging Net Investment Hedging Foreign currency contract Euro USD ($) instrument	Dec. 31, 2013 Designated as hedging Net Investment Hedging Foreign currency contract Euro EUR (€)	Dec. 31, 2013 Not designated Foreign currency contract Yen USD ($) instrument	Dec. 31, 2013 Not designated Foreign currency contract Yen JPY (¥)
Derivative Instrument Detail
Derivative number of instruments		3	3	77	77	16	16	1	1	1	1
Derivative notional amount			€ 14,946		€ 169,417		¥ 746,411		€ 45,000		¥ 610,129
Fair value, foreign currency derivatives	$ (7,976)	$ 429		$ (9,610)		$ 2,002		$ (2,318)		$ 1,521