Income Taxes (Details) (USD $)	12 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Pre-tax income (loss) from continuing operations for domestic and foreign sources
Domestic	$ (950,000)	$ (4,142,000)	$ (3,483,000)
Foreign	6,882,000	23,483,000	19,842,000
Income from continuing operations before income taxes	5,932,000	19,341,000	16,359,000
Current:
Federal and state	(2,000)
Foreign	1,929,000	4,736,000	5,086,000
Total current	1,927,000	4,736,000	5,086,000
Deferred:
Federal and state	(410,000)	(2,720,000)
Foreign	20,000	(530,000)	(713,000)
Total deferred	(390,000)	(3,250,000)	(713,000)
Income tax expense	1,537,000	1,486,000	4,373,000
Reconciliation of income tax expense computed at the United States statutory rate to amounts shown in the Consolidated Statements of Operations:
Federal income taxes at statutory rate (as a percent)	35.00%	35.00%	35.00%
Taxes on foreign income which differ from the U.S. statutory rate (as a percent)	(2.10%)	(18.10%)	(19.80%)
Effect of change in the enacted rate (as a percent)	3.10%	(1.30%)	(0.50%)
Change in valuation allowance (as a percent)	(63.40%)	(46.00%)	10.60%
U.S. taxation of international operations (as a percent)	12.00%	37.30%
Change in estimated liabilities (as a percent)	0.10%	0.40%	1.30%
Non-Deductible Items (as a percent)	41.30%
Other (as a percent)	(0.10%)	0.40%	0.10%
Total (as a percent)	25.90%	7.70%	26.70%
Deferred tax assets:
Federal, state, and foreign net operating losses	26,622,000	31,568,000
State tax credit carryforwards	6,933,000	6,915,000
Postretirement benefits	649,000	862,000
Deferred employee benefits	1,937,000	2,214,000
Accrued pension	7,411,000	15,097,000
Inventory valuation	3,037,000	2,281,000
Foreign tax credit carryforwards	4,502,000	2,677,000
Other	3,262,000	3,608,000
Deferred tax assets, gross	54,353,000	65,222,000
Less valuation allowance	(49,297,000)	(57,698,000)
Total deferred tax assets	5,056,000	7,524,000
Deferred tax liabilities:
Tax over book depreciation	(4,499,000)	(4,428,000)
Inventory valuation	(2,291,000)	(2,323,000)
Intangible assets	(1,831,000)	(3,069,000)
Other	(1,059,000)	(1,367,000)
Total deferred tax liabilities	(9,680,000)	(11,187,000)
Net deferred tax liabilities	(4,624,000)	(3,663,000)
Current deferred tax assets	2,100,000	2,200,000
Non-current deferred tax assets	800,000	600,000
Increase (decrease) in valuation allowance	(8,400,000)	(5,000,000)
Decrease in valuation allowance due to operational results and decrease in minimum pension liabilities in the U.S.	9,500,000
Increase (decrease) in valuation allowance due to acquisition	1,100,000	(2,700,000)
Increase (decrease) in valuation allowance due to operational results		(2,300,000)
Increase in valuation allowance due to the net increase in minimum pension liabilities in the U.S. and the U.K		2,300,000
Net operating loss carryforwards
Undistributed earnings of foreign subsidiaries	121,300,000
Tax rate for Chinese subsidiary (as a percent)			24.00%
Entity's income tax rate in China	25.00%	25.00%
Reconciliation of the beginning and ending amount of unrecognized tax benefits
Balance at beginning of period	2,514,000	2,333,000	2,127,000
Additions for acquired subsidiaries	267,000
Additions for tax positions related to the current year			592,000
Additions for tax positions of prior years	150,000	235,000	170,000
Reductions for tax positions of prior years			(83,000)
Reductions for tax positions related to the current year	(57,000)
Reductions due to lapse of applicable statute of limitations	(131,000)	(54,000)	(23,000)
Settlements			(450,000)
Balance at end of period	2,743,000	2,514,000	2,333,000
Minimum estimated change in uncertain tax positions	400,000
Maximum estimated change in uncertain tax positions	1,100,000
Accrued interest related to the uncertain tax positions	800,000	700,000
Accrued penalties related to uncertain tax positions	200,000	200,000
U.S.
Net operating loss carryforwards
Operating loss carryforwards	44,100,000
Net operating loss carryforward for which a benefit will be recorded in additional paid in capital when realized	2,200,000
State
Net operating loss carryforwards
Operating loss carryforwards	36,300,000
Foreign
Net operating loss carryforwards
Operating loss carryforwards	40,300,000
Foreign | 2018 through 2033
Net operating loss carryforwards
Operating loss carryforwards	6,400,000
Foreign | No expiration date
Net operating loss carryforwards
Operating loss carryforwards	$ 33,800,000