Summary of Significant Accounting Policies and Practices (Details) (USD $) In Thousands, unless otherwise specified	3 Months Ended	12 Months Ended
	Mar. 31, 2011	Dec. 31, 2012
Summary of the effects of deconsolidation of Eltmann
Cash		$ (979)
Accounts receivable		(3,388)
Inventory		(2,407)
Other assets		(193)
Property, plant and equipment		(1,343)
Reduction of total assets		(8,310)
Accounts payable		(1,738)
Accrued salaries		(1,500)
Accrued pension		(5,623)
Accumulated other comprehensive income		551
Reduction of total liabilities and stockholders' equity		(8,310)
Net impact from deconsolidation of bankrupt subsidiary	$ 209	$ 0