Note 13 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2016

Notes Tables

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

	Year Ended December 31,
	2016			2015			2014
Current:
Federal	$	11,717		$	13,614		$	38,161
State		2,047			1,966			1,645
Foreign		4,460			3,588			5,701
		18,224			19,168			45,507
Deferred:
Federal		41,264			31,869			42,474
State		3,029			1,387			(3,134	)
Foreign		(5,585	)		(7,326	)		(1,462	)
		38,708			25,930			37,878
Change in valuation allowance		638			138			364
Provision for income taxes	$	57,570		$	45,236		$	83,749

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

	December 31,
	2016			2015
Deferred tax assets:
Accrued expenses	$	22,758		$	18,982
Deferred revenue		10,645			9,389
Inventories		10,159			9,772
Pension obligations		7,512			7,684
Stock-based compensation		7,291			7,974
Operating loss and credit carryforwards		20,927			15,677
Other		2,822			2,842
Valuation allowance		(4,362	)		(1,523	)
Total deferred tax assets		77,752			70,797
Deferred tax liabilitites:
Goodwill and intangible assets		58,133			12,455
Depreciation		25,194			19,507
Debt refinancing costs		7,193			7,732
Prepaid expenses		1,173			1,241
Total deferred tax liabilities		91,693			40,935
Net deferred tax assets (liabilities)	$	(13,941	)	$	29,862

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

	December 31,
	2016		2015
Unrecognized tax benefit, beginning of period	$	7,239	$	6,394
Increase in unrecognized tax benefit for positions taken in current period		704		845
Unrecognized tax benefit, end of period	$	7,943	$	7,239

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

	Year Ended December 31,
	2016			2015			2014
U.S. statutory rate		35.0	%		35.0	%		35.0	%
State taxes		4.1			4.1			3.1
Research and development credits		(1.0	)		(2.3	)		(5.0	)
Other		(1.3	)		-			(0.7	)
Effective tax rate		36.8	%		36.8	%		32.4	%