Derivatives and Hedge Accounting - Effect of Net Investment Hedges on AOCI (Details) - USD ($) $ in Thousands	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative Instruments, Gain (Loss) [Line Items]
Effect of net investment hedges on accumulated other comprehensive loss	$ (580)	$ 0	$ (580)	$ 0
Foreign currency exchange contracts
Derivative Instruments, Gain (Loss) [Line Items]
Effect of net investment hedges on accumulated other comprehensive loss	$ (580)	$ 0	$ (580)	$ 0