Risk Management and Use of Derivative Financial Instruments - Derivative Gain Loss Recognized in Income (Details) - USD ($) $ in Thousands	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Amount of Gain (Loss) on Derivatives Recognized in Income
Gain (Loss) on Derivative Instruments, Net, Pretax	$ 1,295	$ (428)
Derivatives Not Designated as Hedging Instruments | Foreign currency collars | Other gains and (losses)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of Gain (Loss) on Derivatives Recognized in Income	639	41
Derivatives Not Designated as Hedging Instruments | Foreign currency forward contracts | Other gains and (losses)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of Gain (Loss) on Derivatives Recognized in Income	224	(230)
Derivatives Not Designated as Hedging Instruments | Stock warrants | Other gains and (losses)
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of Gain (Loss) on Derivatives Recognized in Income	100	0
Derivatives Not Designated as Hedging Instruments | Interest rate swaps | Interest expense
Amount of Gain (Loss) on Derivatives Recognized in Income
Amount of Gain (Loss) on Derivatives Recognized in Income	15	0
Derivatives in Cash Flow Hedging Relationships | Foreign currency collars | Other gains and (losses)
Amount of Gain (Loss) on Derivatives Recognized in Income
Gain (Loss) on Hedging Activity	0	7
Derivatives in Cash Flow Hedging Relationships | Foreign currency forward contracts | Other gains and (losses)
Amount of Gain (Loss) on Derivatives Recognized in Income
Gain (Loss) on Hedging Activity	0	(132)
Derivatives in Cash Flow Hedging Relationships | Interest rate swaps | Interest expense
Amount of Gain (Loss) on Derivatives Recognized in Income
Gain (Loss) on Hedging Activity	$ 317	$ (114)