Income Taxes (Tables)

12 Months Ended

Dec. 31, 2018

Income Tax Disclosure [Abstract]

Schedule of income tax expense (benefit)

The income tax expense (benefit) consisted of the following (in thousands):

	Years Ended December 31,
	2018			2017			2016
Current:
Federal	$	(1,136	)	$	2,162		$	—
State	1,469			5,358			4,169
Total current	$	333		$	7,520		$	4,169
Deferred:
Federal	$	42,886		$	(172,048	)	$	11,208
State	(3,565		)	(10,726		)	(2,206		)
Total deferred	$	39,321		$	(182,774	)	$	9,002
Total income tax expense (benefit)	$	39,654		$	(175,254	)	$	13,171

Schedule of reconciliation of the statutory U.S. federal income tax rate to the entity's effective income tax rate

The reconciliation of the statutory U.S. federal income tax rate to our effective income tax rate from continuing operations was as follows:

	Years Ended December 31,
	2018		2017		2016
Statutory U.S. federal tax rate	21.0	%	35.0	%	35.0	%
State taxes, net of federal benefit	4.7		3.3		5.4
Impact of 2017 tax reform on deferred tax balance	—		4.6		—
Equity-based compensation expense	(1.5	)	(0.8	)	16.2
Contingent consideration	7.2		4.4		41.5
Other permanent items, net	(1.4	)	(0.5	)	11.9
Tax credits	6.2		0.7		(19.2	)
Write-down of acquired state net operating losses	—		—		67.7
Valuation allowance	(67.4	)	(0.8	)	(68.3	)
Other, net	0.6		0.2		(3.9	)
Effective tax rate	(30.6	)%	46.1	%	86.3	%

Schedule of components of the entity's deferred tax assets and liabilities

The components of our deferred tax assets and liabilities were as follows (in thousands):

	December 31,
	2018			2017
Assets
Net operating loss carryforwards	$	46,888		$	60,308
Tax credit carryforwards	24,290			15,577
Capital loss carryforwards	20,896			—
Interest expense carryforwards	4,318			—
Equity-based compensation expense	5,931			5,873
Capitalized research & development	4,635			7,872
Intangible assets	12,565			—
Reserves	2,683			3,342
Contingent consideration	87			1,406
Other	5,389			5,971
Valuation allowance	(113,278		)	(4,740		)
Liabilities
Property, plant and equipment depreciation	(614		)	(198		)
Intangible assets and inventory	—			(32,406		)
Debt instruments	(12,489		)	(15,744		)
Other	(41		)	(141		)
Net deferred tax assets	$	1,260		$	47,120

Summary of income tax contingencies

A reconciliation of our changes in unrecognized tax benefits is as follows (in thousands):

	Years Ended December 31,
	2018		2017			2016
Unrecognized tax benefits at the beginning of the year	$	10,560	$	13,020		$	12,695
Additions based on tax positions related to the current year	12		574			300
Additions for tax positions from prior years	608		340			69
Subtractions for federal tax reform	—		(3,296		)	—
Subtractions for tax positions from prior years	—		(78		)	(44		)
Unrecognized tax benefits at the end of the year	$	11,180	$	10,560		$	13,020