Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Schedule of Income before Income Tax, Domestic and Foreign [Table Text Block]

The following is a geographical breakdown of income before the provision for income taxes (in thousands):



	Years Ended December 31,
	2012		2011			2010
Domestic	$	25,794	$	16,177		$	9,551
Foreign	1,281		(88		)	406
Total income before provision for income taxes	$	27,075	$	16,089		$	9,957

Schedule of Components of Income Tax Expense (Benefit) [Table Text Block]

The provision for income taxes consists of the following (in thousands):



	Years Ended December 31,
	2012			2011			2010
Current:
Federal	$	7,181		$	4,285		$	196
State	1,006			896			207
Foreign	154			(70		)	368
Total current	8,341			5,111			771
Deferred:
Federal	2,169			1,116			3,757
State	651			(527		)	473
Foreign	(264		)	—			64
Total deferred	2,556			589			4,294
Total provision for income taxes	$	10,897		$	5,700		$	5,065

Schedule of Effective Income Tax Rate Reconciliation [Table Text Block]

The provision for income taxes differs from the amount computed by applying the statutory federal tax rate as follows (in thousands):



	Years Ended December 31,
	2012			2011			2010
U.S. federal tax provision at statutory rate	$	9,476		$	5,631		$	3,485
State taxes	1,077			240			543
Non-deductible expenses	530			481			350
Acquisition costs	431			—			—
Share-based compensation expense	403			443			244
Research tax credits	—			(755		)	(137		)
Repatriation of foreign earnings	—			(77		)	560
Domestic production deduction	(601		)	(271		)	—
Other	(419		)	8			20
Total	$	10,897		$	5,700		$	5,065

Schedule of Deferred Tax Assets and Liabilities [Table Text Block]

Significant components of our deferred tax assets (liabilities) are as follows (in thousands):



	December 31,
	2012			2011
Deferred tax assets (liabilities):
Tax credit carry forwards	$	2,990		$	3,066
Inventory related items	2,900			3,032
Deferred revenue	11,497			11,979
Stock compensation	9,331			9,187
Loss carry forwards	53			—
Other, net	69			82
Subtotal	26,840			27,346
Less: valuation allowance	(39		)	—
Total net deferred tax assets	26,801			27,346

Reserves and accruals	(573		)	(1,277		)
Depreciation and amortization	(39,840		)	(4,040		)
Total deferred tax assets (liabilities)	(40,413		)	(5,317		)

Net deferred tax assets (liabilities)	$	(13,612	)	$	22,029

Schedule of Unrecognized Tax Benefits Roll Forward [Table Text Block]

The aggregate changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the three years ended December 31, 2012 is as follows (in thousands):



Balance as of December 31, 2009	$	4,295
Increases related to tax positions taken during a prior period	795
Decreases related to tax positions taken during the prior period	(80		)
Increases related to tax positions taken during the current period	421
Balance as of December 31, 2010	5,431
Increases related to tax positions taken during a prior period	—
Decreases related to tax positions taken during the prior period	(88		)
Increases related to tax positions taken during the current period	453
Balance as of December 31, 2011	5,796
Increases related to tax positions taken during a prior period	43
Increases related to tax positions related to MTS	1,066
Decreases related to tax positions taken during the prior period	—
Increases related to tax positions taken during the current period	422
Decreases related to settlements	(33		)
Decreases related to expiration of statute of limitations	(379		)
Balance as of December 31, 2012	$	6,915