CONSOLIDATED STATEMENTS OF CASH FLOWS (USD $) In Thousands, unless otherwise specified	12 Months Ended
Dec. 31, 2014	Dec. 31, 2013	Dec. 31, 2012
Cash provided by operating activities:
Net income	$ 32,534us-gaap_NetIncomeLoss	$ 22,963us-gaap_NetIncomeLoss	$ 16,553us-gaap_NetIncomeLoss
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	18,244	18,363	17,613
Provision for doubtful accounts	249us-gaap_ProvisionForDoubtfulAccounts	190us-gaap_ProvisionForDoubtfulAccounts	73us-gaap_ProvisionForDoubtfulAccounts
Provision for inventory write-downs	3,473us-gaap_InventoryWriteDown	3,680us-gaap_InventoryWriteDown	2,994us-gaap_InventoryWriteDown
Deferred income taxes	(538)	(1,617)	2,536
Tax benefit from exercise of stock options and vested restricted stock	0	874	(83)
Excess tax benefit from stock-based compensation	0	(1,274)	(111)
Shares issued for employee benefit plan	847ueic_SharesIssuedForEmployeeBenefitPlan	747ueic_SharesIssuedForEmployeeBenefitPlan	749ueic_SharesIssuedForEmployeeBenefitPlan
Stock-based compensation	6,444us-gaap_ShareBasedCompensation	5,342us-gaap_ShareBasedCompensation	4,575us-gaap_ShareBasedCompensation
Changes in operating assets and liabilities:
Accounts receivable	(7,966)us-gaap_IncreaseDecreaseInReceivables	(4,509)us-gaap_IncreaseDecreaseInReceivables	(8,998)us-gaap_IncreaseDecreaseInReceivables
Inventories	(8,161)us-gaap_IncreaseDecreaseInInventories	(15,353)us-gaap_IncreaseDecreaseInInventories	2,987us-gaap_IncreaseDecreaseInInventories
Prepaid expenses and other assets	(2,803)	(633)	(588)
Accounts payable and accrued expenses	19,964	2,285	8,186
Accrued income taxes	1,186	(364)	(2,943)
Net cash provided by operating activities	63,473	30,694	43,543
Cash used for investing activities:
Acquisition of property, plant, and equipment	(16,566)	(10,355)	(10,463)
Acquisition of intangible assets	(1,853)	(1,319)	(1,140)
Net cash used for investing activities	(18,419)	(11,674)	(11,603)
Cash (used for) provided by financing activities:
Issuance of debt	0us-gaap_ProceedsFromShortTermDebt	19,500us-gaap_ProceedsFromShortTermDebt	30,800us-gaap_ProceedsFromShortTermDebt
Payment of debt	0us-gaap_RepaymentsOfShortTermDebt	(19,500)us-gaap_RepaymentsOfShortTermDebt	(47,200)us-gaap_RepaymentsOfShortTermDebt
Debt issuance costs	0us-gaap_PaymentsOfDebtIssuanceCosts	0us-gaap_PaymentsOfDebtIssuanceCosts	(42)us-gaap_PaymentsOfDebtIssuanceCosts
Proceeds from stock options exercised	8,122	12,371	2,204
Treasury stock purchased	(16,168)	(3,607)	(3,451)
Excess tax benefit from stock-based compensation	0	1,274	111
Net cash (used for) provided by financing activities	(8,046)	10,038	(17,578)
Effect of exchange rate changes on cash	(661)	2,523	859
Net increase (decrease) in cash and cash equivalents	36,347	31,581	15,221
Cash and cash equivalents at beginning of year	76,174	44,593	29,372
Cash and cash equivalents at end of period	112,521	76,174	44,593
Supplemental Cash Flow Information:
Income taxes paid	7,178us-gaap_IncomeTaxesPaid	6,068us-gaap_IncomeTaxesPaid	10,445us-gaap_IncomeTaxesPaid
Interest paid	$ 0us-gaap_InterestPaid	$ 44us-gaap_InterestPaid	$ 304us-gaap_InterestPaid

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-Name Accounting Standards Codification

-Glossary Financing Activities

-URI http://asc.fasb.org/extlink&oid=6513228

+ Details

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- Definition

The aggregate amount of noncash, equity-based employee remuneration. This may include the value of stock or unit options, amortization of restricted stock or units, and adjustment for officers' compensation. As noncash, this element is an add back when calculating net cash generated by operating activities using the indirect method.

+ References

+ Details

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Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Details

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