Risk Management and Use of Derivative Financial Instruments (Details 4) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2016	Jun. 30, 2015
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	$ (93)	$ 459	$ (234)	$ 519
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	(99)	231	(99)	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	(70)	127	(231)	35
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	25	0	262
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	(12)	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	72	88	96	172
Foreign currency collars | Designated as hedging | Interest expense
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of gain (loss) recognized income on derivatives	$ 4	$ 0	$ 0	$ 0