Income Tax (Tables)

12 Months Ended

Dec. 31, 2014

Income Tax Disclosure [Abstract]

Income Tax Provision (Benefit) on Income from Operations

The income tax provision (benefit) on income from operations consists of the following:

	Years ended December 31,
	2014			2013			2012
Current:
Federal	$	34,504		$	25,625		$	19,113
State		4,827			2,590			1,976
		39,331			28,215			21,089
Deferred		(3,804	)		(1,497	)		(215	)
	$	35,527		$	26,718		$	20,874

Reconciliation of U.S. Statutory Income Tax Rate to Effective Income Tax Expense Rate

Reconciliation of the U.S. statutory income tax rate to our effective income tax expense rate for operations follows:

	Years ended December 31,
	2014			2013		2012
Federal income tax expense at statutory rate	$	33,064		$	23,037	$	18,854
State income tax, net of federal income tax benefit		2,867			2,371		1,365
Non-deductible business expenses		1,485			1,110		1,087
Qualified manufacturing activities		(1,720	)		—		(717	)
Other, net		(169	)		200		285
	$	35,527		$	26,718	$	20,874

Schedule of Deferred Tax Assets and Liabilities

The tax effects of the major items recorded as deferred tax assets and liabilities as of December 31 are:

	2014			2013
Deferred income tax assets:
Operating expenses not currently deductible	$	9,093		$	7,360
Stock option and other employee benefit plans		9,815			7,089
Capital loss and credit carryforward		177			185
Property and equipment		46			149
Total deferred income tax assets		19,131			14,783
Deferred income tax liabilities:
Intangible assets		(13,424	)		(12,910	)
Other		(203	)		(173	)
Total deferred income tax liabilities		(13,627	)		(13,083	)
Net deferred income tax asset	$	5,504		$	1,700