Revenues - Disaggregated Revenues (Details) - USD ($) $ in Thousands	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Disaggregation of Revenue [Line Items]
Revenues	$ 261,064	$ 243,273	$ 872,216	$ 824,401
Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	116,719		475,912
Retail [Member]
Disaggregation of Revenue [Line Items]
Revenues	98,534		257,517
e-Commerce [Member]
Disaggregation of Revenue [Line Items]
Revenues	45,811		138,787
Americas [Member]
Disaggregation of Revenue [Line Items]
Revenues	136,957		398,549
Americas [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	44,883		171,477
Americas [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenues	65,247		156,557
Americas [Member] | e-Commerce [Member]
Disaggregation of Revenue [Line Items]
Revenues	26,827		70,515
Asia Pacific [Member]
Disaggregation of Revenue [Line Items]
Revenues	75,163		288,645
Asia Pacific [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	40,938		172,152
Asia Pacific [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenues	22,942		71,359
Asia Pacific [Member] | e-Commerce [Member]
Disaggregation of Revenue [Line Items]
Revenues	11,283		45,134
Europe [Member]
Disaggregation of Revenue [Line Items]
Revenues	47,419		182,889
Europe [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	29,373		130,150
Europe [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenues	10,345		29,601
Europe [Member] | e-Commerce [Member]
Disaggregation of Revenue [Line Items]
Revenues	7,701		23,138
Other Businesses [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,525		2,133
Other Businesses [Member] | Wholesale [Member]
Disaggregation of Revenue [Line Items]
Revenues	1,525		2,133
Other Businesses [Member] | Retail [Member]
Disaggregation of Revenue [Line Items]
Revenues	0		0
Other Businesses [Member] | e-Commerce [Member]
Disaggregation of Revenue [Line Items]
Revenues	$ 0		$ 0