Restructuring Charges (Details 2) - USD ($) $ in Thousands	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	$ 1,530	$ 6,539
Restructuring Charges	800	6,700	$ 3,500
Restructuring Costs	774	6,676
Restructuring Reserve, Current	423	6,539	1,369
Payments for Restructuring	(5,869)	(1,506)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	134
Restructuring Reserve, Accrual Adjustment	(48)
Employee Severance [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	53	2,505	1,358
Restructuring Charges		600
Restructuring Costs	25	2,582
Payments for Restructuring	(2,683)	(1,435)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	77
Restructuring Reserve, Accrual Adjustment	129
government incentive repayment [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	1,884	0
Restructuring Costs	0	1,884
Payments for Restructuring	(1,769)	0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	57
Restructuring Reserve, Accrual Adjustment	(172)
Special Termination Benefits [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	1,477	1,845	0
Restructuring Costs	0
Buy-out agreement		1,905
Payments for Restructuring	(368)	(60)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	0
Restructuring Reserve, Accrual Adjustment	0
Other Restructuring [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	305	11
Restructuring Costs	168	305
Payments for Restructuring	(468)	(11)
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	0
Restructuring Reserve, Accrual Adjustment	(5)
Business Restructuring Reserves [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Charges		4,200
Facility Closing [Member]
Restructuring Cost and Reserve [Line Items]
Restructuring Reserve	0	0	$ 0
Restructuring Charges	581	0
Payments for Restructuring	(581)	$ 0
Restructuring Reserve, Foreign Currency Translation Gain (Loss)	0
Restructuring Reserve, Accrual Adjustment	$ 0