Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

Constituents of Provision for Income Taxes

Income tax expense on continuing operations consisted of the following (in thousands):

	Year Ended December 31,
	2016			2015			2014
Current:
Federal	$	14,459		$	16,430		$	18,852
State	(617		)	378			608
Foreign	8,149			4,946			4,854
	21,991			21,754			24,314
Deferred:
Federal	(3,031		)	(2,541		)	(2,569		)
State	1,066			(165		)	7
Foreign	(1,058		)	250			(837		)
	(3,023		)	(2,456		)	(3,399		)
	$	18,968		$	19,298		$	20,915

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 U.S. federal statutory corporate tax rate to the Company’s income tax expense on continuing operations, or effective tax rate, was as follows:

	Year Ended December 31,
	2016		2015		2014
Income tax provision at federal statutory corporate tax rate	35	%	35	%	35	%
State income taxes, net of federal benefit	1		—		—
Foreign tax rate differential	(17	)	(19	)	(19	)
Tax credit	(1	)	—		—
Discrete tax benefit related to employee stock option exercises	(7	)	—		—
Other discrete tax events	—		(2	)	(1	)
Other	—		1		1
Income tax provision on continuing operations	11	%	15	%	16	%

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, 2014	$	5,127
Gross amounts of decreases in unrecognized tax benefits as a result of tax positions taken in prior periods	(56		)
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period	1,291
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	(1,066		)
Balance of reserve for income taxes as of December 31, 2015	5,296
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in prior periods	11
Gross amounts of increases in unrecognized tax benefits as a result of tax positions taken in the current period	1,235
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	(823		)
Balance of reserve for income taxes as of December 31, 2016	$	5,719

Constituents of Deferred Tax Assets

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

	December 31,
	2016			2015
Non-current deferred tax assets:
Stock-based compensation expense	$	15,365		$	13,895
Federal and state tax credit carryforwards	5,154			5,091
Inventory and revenue related	2,919			2,985
Depreciation	2,882			2,328
Bonuses, commissions, and other compensation	2,483			2,500
Other	3,714			4,175
Gross non-current deferred tax assets	32,517			30,974
Non-current deferred tax liabilities:
Nondeductible intangible assets	(379		)	(1,198		)
Gross non-current deferred tax liabilities	(379		)	(1,198		)
Valuation allowance	(4,116		)	(3,259		)
Net non-current deferred tax assets	$	28,022		$	26,517
Non-current deferred tax liabilities:
Other	$	—		$	(319	)
Net non-current deferred tax liabilities	$	—		$	(319	)