Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Summary of Provision for Income Tax Expense (Benefit)

The provision for income tax expense (benefit) consisted of the following:

	(In thousands) Years Ended December 31,
	2015			2014			2013
Current tax (benefit) expense
Federal	$	(1,511	)	$	5,258		$	(3,806	)
State	(418		)	244			432
	(1,929		)	5,502			(3,374		)
Deferred tax (benefit) expense
Federal	(29,475		)	1,186			1,173
State	(1,904		)	(315		)	208
	(31,379		)	871			1,381
Income tax (benefit) expense	$	(33,308	)	$	6,373		$	(1,993	)

Summary of Deferred Tax Assets (Liabilities)

Deferred tax (liabilities) assets were comprised of the following:

	(In thousands) December 31,
	2015			2014
Deferred tax assets:
Accrued expenses	$	1,363		$	1,669
Allowance for doubtful accounts	134			94
Contract overrun reserves	4,412			1,766
Deferred compensation	491			464
Employment-related accruals	2,463			5,375
Environmental reserves	772			778
Federal tax credit carryforwards	7,031			2,696
Inventory reserves	2,703			3,873
Investment in common stock	297			300
Pension obligation	3,299			3,959
State net operating loss carryforwards	1,402			1,065
State tax credit carryforwards	5,937			5,382
Stock-based compensation	2,165			2,082
Workers’ compensation	133			121
Other	1,595			1,072
Total gross deferred tax assets	34,197			30,696
Valuation allowance	(7,477		)	(6,882		)
Total gross deferred tax assets, net of valuation allowance	26,720			23,814
Deferred tax liabilities:
Depreciation	(11,802		)	(12,485		)
Goodwill	(2,035		)	(12,105		)
Intangibles	(37,891		)	(51,755		)
Prepaid insurance	(514		)	(685		)
Section 48(a) adjustment	(682		)	(1,334		)
Unbilled receivables	—			(1,115		)
Total gross deferred tax liabilities	(52,924		)	(79,479		)
Net deferred tax liabilities	$	(26,204	)	$	(55,665	)

Principle Reasons for Variation Between Expected and Effective Tax Rate

The principal reasons for the variation between the statutory and effective tax rates were as follows:

	Years Ended December 31,
	2015	2014	2013
Statutory federal income tax (benefit) rate	(35.0)%	35.0%	35.0%
State income taxes (net of federal benefit)	(1.3)	0.9	2.0
Qualified domestic production activities	0.5	(2.3)	(8.9)
Research and development tax credits	(2.9)	(11.3)	(48.9)
Goodwill impairment	6.7	—	—
Increase in valuation allowance	0.6	8.5	0.9
Non deductible book expenses	0.2	0.9	1.8
Changes in deferred tax assets	0.1	(5.0)	(1.5)
Remeasurement of deferred taxes for changes in state tax law	—	(1.9)	—
Changes in tax reserves	0.1	(0.7)	(0.5)
Other	(0.2)	0.2	(1.1)
Effective income tax (benefit) rate	(31.2)%	24.3%	(21.2)%

Reconciliation of Unrecognized Tax Benefits

A reconciliation of the beginning and ending amount of unrecognized tax benefits was as follows:

	(In thousands) Years Ended December 31,
	2015			2014			2013
Balance at January 1,	$	2,803		$	2,297		$	1,356
Additions based on tax positions related to the current year	702			668			668
Additions for tax positions for prior years	—			31			538
Reductions for tax positions for prior years	(48		)	(22		)	—
Reduction to unrecognized tax benefits as a result of a lapse of the applicable statute of limitations	(494		)	(171		)	(265		)
Balance at December 31,	$	2,963		$	2,803		$	2,297