Accrued Expenses and Other Liabilities - Obligation (Details) - USD ($)	3 Months Ended
	Mar. 31, 2017	Dec. 31, 2016
Collective bargaining arrangement, Chemical industry
Principle actuarial assumptions used in calculation of the company's obligations for jubilee payments
Discount rate	1.30%
Annual salary increase rate	3.00%
Collective bargaining arrangement, Chemical industry | Minimum
Principle actuarial assumptions used in calculation of the company's obligations for jubilee payments
Retirement age for men (in years)	61 years 6 months
Retirement age for women (in years)	56 years 6 months
Collective bargaining arrangement, Chemical industry | Maximum
Principle actuarial assumptions used in calculation of the company's obligations for jubilee payments
Retirement age for men (in years)	65 years
Retirement age for women (in years)	65 years
Other non-current liabilities
Other non-current liabilities
Provision for jubilee payments obligation	$ 113,000	$ 107,000