Accrued Compensation (Details) - USD ($) $ in Thousands	Mar. 31, 2018	Dec. 31, 2017
Components of Accrued Compensation
Accrued social insurance	$ 18,279	$ 17,727
Accrued salary/wages	8,240	7,910
Accrued vacation/holiday	3,256	2,769
Accrued bonus	1,563	2,329
Accrued commission	704	1,089
Accrued medical insurance claims	286	286
Other accrued compensation	995	2,389
Total accrued compensation	33,323	34,499
Salaries accrued for thirteenth month	$ 500	$ 700