Risk Management and Use of Derivative Financial Instruments (Details 5) In Thousands, unless otherwise specified	3 Months Ended												3 Months Ended								3 Months Ended
	Mar. 31, 2013 Interest rate swap 6-Month Euribor USD ($)	Mar. 31, 2013 Interest rate swap 6-Month Euribor EUR (€)	Mar. 31, 2013 Interest rate swap 3-Month Euribor February USD ($)	Mar. 31, 2013 Interest rate swap 3-Month Euribor February EUR (€)	Mar. 31, 2013 Interest rate swap 3-Month Euribor March USD ($)	Mar. 31, 2013 Interest rate swap 3-Month Euribor March EUR (€)	Mar. 31, 2013 Interest rate swap 3-Month Euribor June USD ($)	Mar. 31, 2013 Interest rate swap 3-Month Euribor June EUR (€)	Mar. 31, 2013 Interest rate swap 3-Month Euribor July USD ($)	Mar. 31, 2013 Interest rate swap 3-Month Euribor July EUR (€)	Mar. 31, 2013 Interest rate swap 3-Month LIBOR January USD ($)	Mar. 31, 2013 Interest rate swap 3-Month LIBOR August USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR January USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR February USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR March USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR June USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR October USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR December 1 USD ($)	Mar. 31, 2013 Interest rate swap 1-Month LIBOR December 2 USD ($)	Mar. 31, 2013 Interest rate cap	Mar. 31, 2013 Interest rate cap 3-Month LIBOR August USD ($)
Derivative Instrument Detail
Notional Amount		€ 164,250		€ 9,990		€ 12,750		€ 3,836		€ 5,814	$ 25,689		$ 4,097	$ 92,400	$ 9,000	$ 4,429	$ 4,270	$ 19,941	$ 1,593		$ 118,374
Effective Interest Rate	4.20%	4.20%	4.40%	4.40%	8.50%	8.50%	4.30%	4.30%	5.80%	5.80%	6.60%		6.00%	3.90%	5.00%	4.60%	4.80%	4.80%	4.80%
Effective Date	Sep. 01, 2011	Sep. 01, 2011	Feb. 01, 2013	Feb. 01, 2013	Mar. 01, 2013	Mar. 01, 2013	Jun. 01, 2012	Jun. 01, 2012	Jul. 01, 2010	Jul. 01, 2010	Jan. 01, 2010		Jan. 01, 2011	Feb. 01, 2012	Mar. 01, 2012	Jun. 01, 2012	Oct. 01, 2012	Dec. 01, 2012	Dec. 01, 2011		Aug. 01, 2009
Expiration Date	Sep. 01, 2016	Sep. 01, 2016	Feb. 01, 2018	Feb. 01, 2018	Mar. 01, 2020	Mar. 01, 2020	May 01, 2017	May 01, 2017	Nov. 01, 2017	Nov. 01, 2017	Dec. 01, 2019		Jan. 01, 2021	Feb. 01, 2017	Mar. 01, 2022	Jul. 01, 2022	Nov. 01, 2022	Dec. 01, 2022	Dec. 01, 2021		Aug. 01, 2014
Fair Value	$ (9,416)		$ (236)		$ (212)		$ (153)		$ (572)		$ (3,563)	$ 0	$ (507)	$ (2,466)	$ (341)	$ (70)	$ (54)	$ (182)	$ (68)
Cap rate																				4.00%
Debt, interest rate at period end																				2.80%