Operating Segments and Geographic Information (Information Related To Reportable Operating Business Segments) (Details) - USD ($) $ in Thousands	3 Months Ended	9 Months Ended
Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Segment Reporting Information [Line Items]
Total consolidated revenues	$ 261,064	$ 243,273	$ 872,216	$ 824,401
Income (loss) from operations	13,895	2,685	76,881	47,713
Foreign currency gains, net	233	(257)	1,587	181
Interest income	422	269	847	576
Interest expense	(126)	(167)	(371)	(539)
Other income, net	160	54	229	187
Income before income taxes	14,584	2,584	79,173	48,118
Total consolidated depreciation and amortization	6,661	7,886	21,535	24,701
Americas [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	136,957		398,549
Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	75,163		288,645
Europe [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	47,419		182,889
Reportable Operating Segments [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	259,539	243,019	870,083	823,856
Income (loss) from operations	71,511	43,383	239,273	187,194
Total consolidated depreciation and amortization	1,821	2,620	6,248	7,923
Reportable Operating Segments [Member] \| Americas [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	136,957	120,459	398,549	374,336
Income (loss) from operations	42,586	24,398	110,814	81,132
Total consolidated depreciation and amortization	1,098	1,383	3,613	4,075
Reportable Operating Segments [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	75,163	75,320	288,645	278,656
Income (loss) from operations	16,861	14,115	74,640	70,880
Total consolidated depreciation and amortization	422	863	1,655	2,710
Reportable Operating Segments [Member] \| Europe [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	47,419	47,240	182,889	170,864
Income (loss) from operations	12,064	4,870	53,819	35,182
Total consolidated depreciation and amortization	301	374	980	1,138
Reportable Operating Segments [Member] \| Other businesses [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues	1,525	254	2,133	545
Income (loss) from operations	(14,092)	(6,233)	(41,557)	(16,883)
Total consolidated depreciation and amortization	1,213	1,618	4,168	5,106
Unallocated corporate and other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations	(43,524)	(34,465)	(120,835)	(122,598)
Total consolidated depreciation and amortization	$ 3,627	3,648	$ 11,119	11,672
Change in Segment Composition [Member] \| Adjustments for revised presentation [Member] \| Reportable Operating Segments [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues		(4,719)		(24,372)
Income (loss) from operations		527		(6,203)
Change in Segment Composition [Member] \| Adjustments for revised presentation [Member] \| Reportable Operating Segments [Member] \| Europe [Member]
Segment Reporting Information [Line Items]
Total consolidated revenues		4,719		24,372
Income (loss) from operations		(527)		6,203
Marketing Expense Realignment [Member] \| Adjustments for revised presentation [Member] \| Reportable Operating Segments [Member] \| Americas [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		297		9,823
Marketing Expense Realignment [Member] \| Adjustments for revised presentation [Member] \| Reportable Operating Segments [Member] \| Asia Pacific [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		323		3,789
Marketing Expense Realignment [Member] \| Adjustments for revised presentation [Member] \| Reportable Operating Segments [Member] \| Europe [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		(19)		1,258
Marketing Expense Realignment [Member] \| Adjustments for revised presentation [Member] \| Unallocated corporate and other [Member]
Segment Reporting Information [Line Items]
Income (loss) from operations		$ (601)		$ (14,870)

The aggregate expense recognized in the current period that allocates the cost of tangible assets, intangible assets, or depleting assets to periods that benefit from use of the assets.

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