INCOME TAXES - Reconciliation of Income Tax Provision (Details) (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2011
Reconciliation of income tax provision
Federal statutory income tax rate (as a percent)	35.00%	35.00%	35.00%
Federal income tax at statutory rate	$ 3,652	$ 5,793	$ 5,900
State and local tax items not included below, net	815	431	209
Effect of difference between U.S. Federal and foreign tax rates	(1,655)	(1,459)	(554)
Permanent differences, foreign interest expense	(434)	(859)	(784)
Permanent differences, U.S. manufacturing tax deduction	(224)	(356)	(414)
Permanent differences, German tax audit settlement	812	0	0
Permanent differences, deemed repatriation of foreign earnings	(914)	914	0
Permanent differences, intercompany distributions	1,250	0	0
Permanent differences, foreign equity compensation	228	247	196
Permanent differences, other	165	79	83
Current year tax credits	(649)	(29)	(142)
Impact of statutory tax rate change	(6)	198	(31)
Other	(99)	(101)	(94)
Provision for income taxes	$ 2,941	$ 4,858	$ 4,369

Effective Income Tax Rate Reconciliation, Intercompany Distributions

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The portion of the difference between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations attributable to foreign interest expenses.

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Percentage of domestic federal statutory tax rate applicable to pretax income (loss).

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Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations, attributable to increase (decrease) in the income tax rates.

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Amount of the difference between reported income tax expense (benefit) and the expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to deduction for qualified production activity.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to nondeductible equity-based compensation costs.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit).

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to tax credits. Including, but not limited to, research credit, foreign tax credit, investment tax credit, and other tax credits.

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Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to income tax settlements. Including, but not limited to, domestic tax settlement, foreign tax settlement, state and local tax settlement, and other tax settlements.

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