Property and Equipment, Net (Schedule of Property Impairments) (Details) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) stores	Dec. 31, 2016 USD ($) stores	Dec. 31, 2015 USD ($) stores
Property, Plant and Equipment [Line Items]
Retail store asset impairment | $			$ 15,271
Number of retail stores impaired | stores	4	42	84
Americas [Member]
Property, Plant and Equipment [Line Items]
Retail store asset impairment | $	$ 455	$ 1,703	$ 7,237
Number of retail stores impaired | stores	3	12	27
Asia Pacific [Member]
Property, Plant and Equipment [Line Items]
Retail store asset impairment | $	$ 0	$ 672	$ 6,450
Number of retail stores impaired | stores	0	21	36
Europe [Member]
Property, Plant and Equipment [Line Items]
Retail store asset impairment | $	$ 75	$ 338	$ 1,584
Number of retail stores impaired | stores	1	9	21