Operating Segments and Geographic Information (Schedule Of Segment Balance Sheet) (Details) - USD ($) $ in Thousands	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Segment Reporting Information [Line Items]
Income tax receivable	$ 2,995	$ 10,233
Other receivables	14,642	14,233
Restricted cash - current	2,534	2,554
Prepaid expenses and other current assets	32,413	23,780
Total current assets	425,475	445,949
Property and equipment, net	44,090	49,490
Intangible assets, net	72,700	82,297
Goodwill	1,480	1,973	$ 2,044
Deferred tax assets, net	6,825	6,608
Restricted cash	2,547	3,551
Other assets	13,273	18,152
Total assets	566,390	608,020
Supply Chain [Member]
Segment Reporting Information [Line Items]
Total current assets	12,343	14,778
Operating Segments [Member]
Segment Reporting Information [Line Items]
Total current assets	341,414	364,106
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Total current assets	128,071	148,104
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Total current assets	144,037	169,865
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Total current assets	69,306	46,137
Corporate [Member]
Segment Reporting Information [Line Items]
Total current assets	$ 19,134	$ 16,265