Concentrations and Risks (Details) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014
Revenues earned in geographic areas
Total	$ 421,389	$ 460,141
Total wholesale business [Member]
Revenues earned in geographic areas
Total	196,589	215,472
Retail business [Member]
Revenues earned in geographic areas
Total	224,800	244,669
The People's Republic of China [Member]
Revenues earned in geographic areas
Total	106,694	98,082
Germany [Member]
Revenues earned in geographic areas
Total	13,425	27,077
United Kingdom [Member]
Revenues earned in geographic areas
Total	16,098	22,109
Europe-Other [Member]
Revenues earned in geographic areas
Total	29,556	33,264
Japan [Member]
Revenues earned in geographic areas
Total	13,039	17,877
United States [Member]
Revenues earned in geographic areas
Total	$ 17,777	$ 17,063