Note 15 - Income Taxes (Tables)

12 Months Ended

Dec. 31, 2019

Notes Tables

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

	Year Ended December 31,
	2019			2018			2017
Current:
Federal	$	41,686		$	32,072		$	15,753
State		4,211			9,639			1,775
Foreign		2,660			4,546			4,585
		48,557			46,257			22,113
Deferred:
Federal		19,393			22,225			18,213
State		1,390			1,910			4,139
Foreign		(1,263	)		479			(2,777	)
		19,520			24,614			19,575
Change in valuation allowance		(778	)		(1,015	)		2,454
Provision for income taxes	$	67,299		$	69,856		$	44,142

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

	December 31,
	2019			2018
Deferred tax assets:
Accrued expenses	$	21,053		$	16,745
Deferred revenue		14,697			12,418
Inventories		9,879			8,500
Pension obligations		-			1,062
Stock-based compensation		7,490			5,960
Operating loss and credit carryforwards		28,356			25,585
Bad debt		1,094			1,363
Other		4,275			2,516
Valuation allowance		(5,024	)		(5,802	)
Total deferred tax assets		81,820			68,347
Deferred tax liabilities:
Goodwill and intangible assets		142,159			108,899
Depreciation		27,864			25,429
Debt refinancing costs		4,119			4,206
Prepaid expenses		1,073			950
Total deferred tax liabilities		175,215			139,484
Net deferred tax liabilities	$	(93,395	)	$	(71,137	)

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

	December 31,
	2019			2018
Unrecognized tax benefit, beginning of period	$	5,635		$	7,122
Increase in unrecognized tax benefit for positions taken in prior period		633			-
Increase in unrecognized tax benefit for positions taken in current period		495			580
Statute of limitation expirations		(43	)		(1,818	)
Settlements		-			(249	)
Unrecognized tax benefit, end of period	$	6,720		$	5,635

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

	Year Ended December 31,
	2019			2018			2017
U.S. statutory rate		21.0	%		21.0	%		35.0	%
State taxes		4.3			4.7			4.1
State tax rate differential		(1.0	)		-			-
Research and development credits		(0.8	)		(1.3	)		(1.4	)
State credits		(1.0	)		(1.0	)		(0.2	)
Share-based compensation (1)		(0.6	)		(0.5	)		(1.4	)
Tax Act impact (2)		-			(0.2	)		(13.9	)
Other		(0.8	)		(0.2	)		(0.9	)
Effective tax rate		21.1	%		22.5	%		21.3	%