Taxes (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Constituents of Provision for Income Taxes

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

	Year Ended December 31,
	2014			2013		2012
Current:
Federal	$	23,484		$	8,720	$	11,284
State	973			721		789
Foreign	4,854			3,167		5,790
	29,311			12,608		17,863
Deferred:
Federal	(2,569		)	1,580		428
State	7			119		36
Foreign	(837		)	6		205
	(3,399		)	1,705		669
	$	25,912		$	14,313	$	18,532

Reconciliation of the United States Federal Statutory Corporate Tax Rate to the Company's Effective Tax Rate or Income Tax Provision

A reconciliation of the United States federal statutory corporate tax rate to the Company’s effective tax rate was as follows:

	Year Ended December 31,
	2014		2013		2012
Income tax provision at federal statutory rate	35	%	35	%	35	%
State income taxes, net of federal benefit	1		1		1
Foreign tax rate differential	(17	)	(17	)	(14	)
Tax credit	—		(1	)	—
Discrete tax events	(1	)	(3	)	—
Other	—		1		(1	)
Income tax provision	18	%	16	%	21	%

Changes in the Reserve for Income Taxes, Excluding Interest and Penalties

The changes in the reserve for income taxes, excluding gross interest and penalties, were as follows (in thousands):

Balance of reserve for income taxes as of December 31, 2012	$	4,024
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in prior periods	438
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period	1,048
Gross amounts of decreases in unrecognized tax benefits relating to settlements with taxing authorities	—
Gross amounts of decreases in unrecognized tax benefits as a result of the expiration of the applicable statutes of limitations	(1,102		)
Balance of reserve for income taxes as of December 31, 2013	4,408
Gross amounts of decreases in unrecognized tax benefits as a result of tax positions taken in prior periods	(226		)
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period	1,095
Gross amounts of decreases in unrecognized tax benefits relating to settlements with taxing authorities	(15		)
Gross amounts of decreases in unrecognized tax benefits as a result of the expiration of the applicable statutes of limitations	(135		)
Balance of reserve for income taxes as of December 31, 2014	$	5,127

Constituents of Deferred Tax Assets

Deferred tax assets consisted of the following (in thousands):

	December 31,
	2014			2013
Current deferred tax assets:
Inventory and revenue related	$	4,911		$	5,614
Bonuses, commissions, and other compensation	2,280			1,377
Other	1,794			1,292
Gross current deferred tax assets	8,985			8,283
Valuation allowance	—			(672		)
Net current deferred tax assets	$	8,985		$	7,611
Noncurrent deferred tax assets:
Stock-based compensation expense	$	10,290		$	7,488
Federal and state tax credit carryforwards	4,547			5,418
Depreciation	1,945			1,831
Acquired completed technologies and other intangible assets	450			835
Unrealized investment gains and losses	355			601
Correlative tax relief and deferred interest related to reserves	342			252
Other	1,436			1,178
Gross noncurrent deferred tax assets	19,365			17,603
Noncurrent deferred tax liabilities:
Nondeductible intangible assets	(2,430		)	(3,662		)
Other	—			(548		)
Gross noncurrent deferred tax liabilities	(2,430		)	(4,210		)
Valuation allowance	(2,483		)	(1,086		)
Net noncurrent deferred tax assets	$	14,452		$	12,307