Risk Management and Use of Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	$ 287	$ (177)	$ 53	$ 341
Stock warrants | Not designated | Other income and (expense)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	165	0	66	66
Swaption | Not designated | Other income and (expense)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	(20)	(212)	(251)	(177)
Embedded credit derivatives | Not designated | Other income and (expense)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	0	(26)	0	235
Foreign currency forward contracts | Not designated | Other income and (expense)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	0	0	0	(16)
Interest rate swaps | Designated as hedging | Interest expense
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	147	61	243	233
Foreign currency collars | Designated as hedging | Other income and (expense)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	$ (5)	$ 0	$ (5)	$ 0