Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

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,
	2013		2012		2011
Domestic	$	34,678	$	25,794	$	16,177
Foreign	351		1,281		(88		)
Total income before provision for income taxes	$	35,029	$	27,075	$	16,089

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,
	2013			2012			2011
Current:
Federal	$	8,218		$	7,181		$	4,285
State	1,621			1,006			896
Foreign	447			154			(70		)
Total current	10,286			8,341			5,111
Deferred:
Federal	1,287			2,169			1,116
State	(263		)	651			(527		)
Foreign	(260		)	(264		)	—
Total deferred	764			2,556			589
Total provision for income taxes	$	11,050		$	10,897		$	5,700

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,
	2013			2012			2011
U.S. federal tax provision at statutory rate	$	12,260		$	9,476		$	5,631
State taxes	883			1,077			240
Non-deductible expenses	297			530			481
Acquisition costs	—			431			—
Share-based compensation expense	407			403			443
Research tax credits	(1,430		)	—			(755		)
Domestic production deduction	(816		)	(601		)	(271		)
Other	(551		)	(419		)	(69		)
Total	$	11,050		$	10,897		$	5,700

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,
	2013			2012
Deferred tax assets (liabilities):
Tax credit carry forwards	$	3,160		$	2,990
Inventory related items	2,947			2,900
Deferred revenue	11,074			11,497
Stock compensation	7,447			9,331
Loss carry forwards	64			53
Other, net	5			69
Subtotal	24,697			26,840
Less: valuation allowance	(39		)	(39		)
Total net deferred tax assets	24,658			26,801

Reserves and accruals	(353		)	(573		)
Depreciation and amortization	(38,681		)	(39,840		)
Total deferred tax liabilities	(39,034		)	(40,413		)

Net deferred tax liabilities	$	(14,376	)	$	(13,612	)

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

he aggregate changes in the balance of gross unrecognized tax benefits, which excludes interest and penalties, for the three years ended December 31, 2013 is as follows (in thousands):



Balance as of December 31, 2010	$	5,431
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
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
Increases related to tax positions taken during a prior period	406
Decreases related to tax positions taken during the prior period	(79		)
Increases related to tax positions taken during the current period	764
Decreases related to expiration of statute of limitations	(32		)
Balance as of December 31, 2013	$	7,974