Derivatives ((Losses) in Foreign Currency Translation Adjustment) (Details) - USD ($) $ in Thousands	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Derivative instruments designated as hedging instruments \| Net investment hedges \| Foreign exchange contracts
Derivative [Line Items]
(Losses) gains recognized in AOCI	$ (598)	$ 4,938	$ (2,603)	$ 3,785

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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