Operating Segments and Geographic Information (Narrative) (Details) $ in Thousands	3 Months Ended								12 Months Ended
	Dec. 31, 2017 USD ($)	Sep. 30, 2017 USD ($)	Jun. 30, 2017 USD ($)	Mar. 31, 2017 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2016 USD ($)	Jun. 30, 2016 USD ($)	Mar. 31, 2016 USD ($)	Dec. 31, 2017 USD ($) stores segments	Dec. 31, 2016 USD ($) stores	Dec. 31, 2015 USD ($) stores
Segment Reporting Information [Line Items]
Number of operating segments | segments									3
Impairment of discontinued project										$ 0	$ 0
Asset impairments									$ 5,284	3,144	15,306
Goodwill impairment										431
Revenues	$ 199,112	$ 243,273	$ 313,221	$ 267,907	$ 187,417	$ 245,888	$ 323,828	$ 279,140	1,023,513	1,036,273	1,090,630
Operating Segments [Member]
Segment Reporting Information [Line Items]
Revenues									1,022,643	1,035,528	1,089,534
Operating Segments [Member] | Americas [Member]
Segment Reporting Information [Line Items]
Asset impairments									$ 500	$ 1,700	$ 7,200
Number of retail stores with impairment charges | stores									3	12	27
Operating Segments [Member] | Asia Pacific [Member]
Segment Reporting Information [Line Items]
Asset impairments									$ 0	$ 700	$ 700
Number of retail stores with impairment charges | stores									0	21	27
Revenues									$ 369,667	$ 395,078	$ 424,491
Operating Segments [Member] | Europe [Member]
Segment Reporting Information [Line Items]
Asset impairments									$ 100	$ 300	$ 1,600
Number of retail stores with impairment charges | stores									1	9	21
Goodwill impairment										$ 400
Revenues									$ 172,830	173,444	$ 188,833
Non-US [Member]
Segment Reporting Information [Line Items]
Revenues									$ 634,666	$ 651,334	$ 698,167
Geographic Concentration Risk [Member] | Sales Revenue, Net [Member] | Japan [Member]
Segment Reporting Information [Line Items]
Percentage of consolidated revenues (percent)									10.60%