Income Taxes Income tax disclosure (Tables)

12 Months Ended

Dec. 31, 2016

Income Tax Disclosure [Abstract]

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

Income from continuing operations before taxes consisted of the following (in thousands): 

	Year Ended December 31,
	2016		2015			2014
United States	$	80,714	$	74,288		$	33,508
Foreign	4,450		(4,589		)	6,284
	$	85,164	$	69,699		$	39,792

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

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

	Year Ended December 31,
	2016			2015			2014
Current:
Federal	$	21,123		$	18,601		$	13,860
State	2,347			745			(1,305		)
Foreign	1,118			1,426			2,100
	24,588			20,772			14,655
Deferred:
Federal	$	(2,045	)	$	4,524		$	(2,325	)
State	(767		)	(960		)	988
Foreign	304			378			139
	(2,508		)	3,942			(1,198		)
	$	22,080		$	24,714		$	13,457

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

econciliation of the provision for income taxes at the statutory rate to our effective tax rate is as follows (dollars in thousands):

	Year Ended December 31,
	2016					2015					2014
	Amount			Percent		Amount			Percent		Amount			Percent
Federal tax at the expected statutory rate	$	29,807		35.0	%	$	24,395		35.0	%	$	13,927		35.0	%
State income tax, net of federal effect	1,795			2.1	%	2,661			3.9	%	981			2.5	%
Tax credits	(1,014		)	(1.2	)%	(5,861		)	(8.4	)%	(1,591		)	(4.0	)%
Domestic production activities/other	(653		)	(0.8	)%	107			0.1	%	101			0.2	%
Foreign income tax	(135		)	(0.1	)%	3,412			4.9	%	39			0.1	%
Stock compensation - ASU 2016-09	(7,720		)	(9.1	)%	—			—	%	—			—	%
	$	22,080		25.9	%	$	24,714		35.5	%	$	13,457		33.8	%

Deferred tax provision table text block [Table Text Block]

The components of our deferred income tax provision are as follows (in thousands): 

	Year Ended December 31,
	2016			2015			2014
Allowance for doubtful accounts	$	—		$	—		$	4
Inventory reserves	(162		)	284			(488		)
Accruals	(2,599		)	(2,977		)	(1,326		)
State income taxes	61			502			(4		)
Acquired future tax deductions	1,520			3,139			96
Depreciation and amortization	(2,544		)	1,080			(780		)
Net operating loss	(2,256		)	195			62
Tax credits	(873		)	(635		)	1,238
Valuation allowance	4,345			2,354			—
	$	(2,508	)	$	3,942		$	(1,198	)

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

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

	December 31,
	2016			2015
Deferred tax asset:
State income taxes	$	(1,708	)	$	(1,647	)
Foreign	1,223			3,881
Accruals/other	857			1,432
Depreciation and amortization	(10,027		)	(11,735		)
Acquired future tax deductions	6,473			5,778
Stock-based compensation	11,089			8,864
Foreign currency translation adjustments	5,175			5,360
Tax credits state	6,764			5,887
Inventory reserves	1,938			1,633
Allowance for doubtful accounts	151			—
Valuation allowance	—			(2,354		)
	$	21,935		17,099
Deferred tax liability:
Foreign	$	1,370		$	1,372
	$	1,370		$	1,372

Summary of Positions for which Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Table Text Block]

The following table summarizes our cumulative gross unrecognized tax benefits (in thousands): 

	Year Ended December 31,
	2016			2015			2014
Beginning balance	$	1,772		$	4,115		$	5,544
Increases to prior year tax positions	77			25			217
Increases to current year tax positions	345			345			661
Decreases to prior year tax positions	(46		)	(2,399		)	—
Decrease related to settlements	—			(314		)	(2,113		)
Decrease related to lapse of statute of limitations	(148		)	—			(194		)
Ending balance	$	2,000		$	1,772		$	4,115