Business Combination (Details) (USD $)	3 Months Ended	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2013	Sep. 30, 2012	Jun. 30, 2013	Mar. 31, 2013
Business Acquisition, Cost of Acquired Entity, Purchase Price [Abstract]
Purchase price (cost of shares)		$ 154,735,000
Acquisition related costs (included in selling, general and administrative expenses)		2,075,000
Total purchase price		156,810,000
Business Acquisition, Pro Forma Information [Abstract]
Net revenues	204,639,000	636,954,000	576,406,000
Net income	8,768,000	21,039,000	13,714,000
Net income per common share-Basic	$ 0.19	$ 0.45	$ 0.30
Net income per common share-Diluted	$ 0.19	$ 0.44	$ 0.29
Business Acquisition, Pro Forma Information, Description		The following unaudited pro forma consolidated results of operations for the quarters ended September 30, 2013 and 2012 have been prepared as if the acquisition of BCD had occurred at January 1, 2012, for each year The unaudited pro forma consolidated results of operations do not purport to be indicative of the results that would have been obtained if the above acquisition had actually occurred as of the dates indicated or of those results that may be obtained in the future. These unaudited pro forma consolidated results of operations were derived, in part, from the historical consolidated financial statements of BCD and other available information and assumptions believed to be reasonable under the circumstances.
Business Combinations [Abstract]
Business Acquisition, Name of Acquired Entity		BCD Semiconductor Manufacturing Limited (“BCD”)
Business Acquisition, Effective Date of Acquisition		Mar. 05, 2013
Business Acquisition, Cost of Acquired Entity, Description of Purchase Price Components		the Company completed the acquisition of all the outstanding ordinary shares, par value $0.001 per share, of BCD (the “Shares”), including Shares represented by American Depository Shares (“ADSs”), which were cancelled in exchange for the right to receive $1.33-1/3 in cash per Share, without interest. Each ADS represented six Shares and was converted into the right to receive $8.00 in cash, without interest. The aggregate consideration was approximately $155 million, excluding acquisition costs, fees and expenses. In addition, a $5 million retention plan for employees of BCD, payable at the 12, 18 and 24 month anniversaries of the acquisition, has been established.
Employee Retention Payable		5,000,000
Business Acquisition, Period Results Included in Combined Entity		214 days
Business Combination, Pro Forma Information, Revenue of Acquiree since Acquisition Date, Actual		110,000,000
Business Combination, Pro Forma Information, Earnings or Loss of Acquiree since Acquisition Date, Actual		3,000,000
Business Combination, Reason for Business Combination		The Company’s purpose in making this acquisition is to further its strategy of expanding its market and growth opportunities through select strategic acquisitions. This acquisition is expected to enhance the Company’s analog product portfolio by expanding its standard linear and power management offerings, including AC/DC and DC/DC solutions for power adapters and chargers, as well as other electronic products. BCD’s established presence in Asia, with a particularly strong local market position in China, offers the Company even greater penetration of the consumer, computing and communications markets. Likewise, the Company believes it can achieve increased market penetration for BCD’s products by leveraging the Company’s own global customer base and sales channels. In addition, BCD has in-house manufacturing capabilities in China, as well as a cost-effective development team that can be deployed across multiple product families. The Company also believes it will be able to apply its packaging capabilities and expertise to BCD’s products in order to improve cost efficiencies, utilization and product mix.
Business Acquisition, Purchase Price Allocation, Methodology		The fair value of the significant identified intangible assets was estimated by using the market approach, income approach and cost approach valuation methodologies. Inputs used in the methodologies primarily included projected future cash flows, discounted at a rate commensurate with the risk involved.
Acquired Finite-lived Intangible Asset, Amount		17,000,000
Acquired Finite-lived Intangible Asset, Residual Value		0
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life		6 years
Business Acquisition, Purchase Price Allocation, Goodwill, Expected Tax Deductible Amount, Description		In addition, it is not anticipated that goodwill will be deductible for income tax purposes.
Acquired Inventory Reasonable Profit Allowance		The Company evaluated and adjusted the acquired inventory for a reasonable profit allowance, which is intended to permit the Company to report only the profits normally associated with its activities following the acquisition as it relates to the work-in-progress and finished goods inventory. As such, the Company increased the inventory acquired from BCD by approximately $5 million, and recorded that increase into cost of goods sold, of which approximately $2 million was recorded in the first quarter of 2013 and $3 million was recorded in the second quarter of 2013 as the acquired work-in-progress and finished goods inventory was sold.
Acquired Inventory Adjustments		5,000,000
Acquired Inventory Expenses To Cost Of Goods Sold				3,000,000	2,000,000
Business Combination, Acquired Receivables, Description		The Company estimated the fair value of acquired receivables to be $21 million with a gross contractual amount of $21million. The Company expects to collect substantially all of the acquired receivables.
Business Combination, Acquired Receivables, Fair Value		21,000,000
Business Combination, Acquired Receivables, Gross Contractual Amount		21,000,000
Business Combination, Acquired Receivables, Estimated Uncollectible		0
Business Combination, Step Acquisition, Equity Interest in Acquiree, Description		The step acquisition guidelines also require that the Company remeasure its preexisting investment in BCD at fair value, and recognize any gains or losses from such remeasurement. The fair value of the Company’s interest immediately before the closing date was $7 million, which resulted in the Company recognizing a non-cash gain of approximately $4 million within other income (expense) for the nine months ended September 31, 2013. The shares of BCD common stock were valued under the fair value hierarchy as a Level 1 Input.
Business Combination, Step Acquisition, Equity Interest in Acquiree, Fair Value		7,000,000
Business Combination, Step Acquisition, Equity Interest in Acquiree, Valuation Techniques		The shares of BCD common stock were valued under the fair value hierarchy as a Level 1 Input.
Business Combination, Step Acquisition, Equity Interest in Acquiree, Remeasurement Gain		4,000,000
Initial Purchase Price Allocation [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Cash and cash equivalents		29,819,000
Accounts receivable, net		20,862,000
Inventory		42,909,000
Prepaid expenses and other current assets		27,205,000
Property, plant and equipment, net		99,716,000
Deferred tax assets		1,612,000
Other long-term assets		5,497,000
Other intangible assets		17,200,000
Goodwill		2,192,000
Total assets acquired		247,012,000
Lines of credit		17,336,000
Accounts payable		34,758,000
Accrued liabilites and other		16,703,000
Deferred tax liability		5,055,000
Other liabilities		18,425,000
Total liabilities assumed		92,277,000
Total net assets acquired, net of cash acquired		154,735,000
Purchase Price Allocation Adjustments [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Property, plant and equipment, net		(326,000)
Goodwill		326,000
Purchase Price Allocation [Member]
Business Acquisition, Purchase Price Allocation [Abstract]
Cash and cash equivalents		29,819,000
Accounts receivable, net		20,862,000
Inventory		42,909,000
Prepaid expenses and other current assets		27,205,000
Property, plant and equipment, net		99,390,000
Deferred tax assets		1,612,000
Other long-term assets		5,497,000
Other intangible assets		17,200,000
Goodwill		2,518,000
Total assets acquired		247,012,000
Lines of credit		17,336,000
Accounts payable		34,758,000
Accrued liabilites and other		16,703,000
Deferred tax liability		5,055,000
Other liabilities		18,425,000
Total liabilities assumed		92,277,000
Total net assets acquired, net of cash acquired		$ 154,735,000