Derivatives (Gains (Losses) in Foreign Currency Translation Adjustment and Foreign Exchange Income) (Details) - Derivative instruments designated as hedging instruments - Net investment hedges - Foreign exchange swap contracts - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
(Losses) gains recognized in AOCI	$ (471)	$ 6,072	$ (648)
Gains (losses) recognized in foreign exchange income	$ 0	$ 0	$ (1,953)