Derivatives and Hedging Activities - Income Statement Effect (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts of interest expense presented in the consolidated statements of operations	$ (554)	$ (328)	$ (950)	$ (731)
Total amounts of gain (loss) on foreign currency transactions presented in the consolidated statements of operations	3	(2)	(4)	(68)
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income or loss	(813)	(232)	(216)	544
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts of interest expense presented in the consolidated statements of operations	(554)	(328)	(950)	(731)
Amount of loss related to changes in fair values of interest rate derivatives not designated as a hedging instrument	(94)	0	(263)	0
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income or loss	118	231	243	486
Amount of loss reclassified from accumulated other comprehensive loss into income or loss as a result of a forecasted transaction being no longer probable of occurring	(352)		(369)
Foreign Currency Transactions
Derivative Instruments, Gain (Loss) [Line Items]
Total amounts of gain (loss) on foreign currency transactions presented in the consolidated statements of operations	3	(2)	(4)	(68)
Amount of (loss) gain reclassified from accumulated other comprehensive loss into income or loss	$ (806)	(569)	$ (44)	298
Amount of loss reclassified from accumulated other comprehensive loss into income or loss as a result of a forecasted transaction being no longer probable of occurring		$ 0		$ 0