Income Taxes (Schedule of Unrecognized Tax Benefits) (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward]
Unrecognized tax benefits, beginning of year	$ 25,910	$ 19,262
Increases - tax positions taken in prior period	725	4,426
Decreases - tax positions taken in prior period	(107)	(124)
Increases - tax positions taken in current period	2,644	2,346
Settlement and lapse of statute of limitations	(4,944)
Currency translation adjustment	(1,644)
Unrecognized tax benefits, end of year	$ 22,584	$ 25,910