Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Taxes

Schedule of components of income tax expense (benefit)

        Components of income tax expense (benefit) consist of the following (in thousands):

	Year Ended December 31,
	2015			2014			2013
Current:
Federal	$	320,726		$	137,993		$	120,030
State		33,978			19,051			20,099
Foreign		806			1,252			2,164
Total current		355,510			158,296			142,293
Deferred
Federal		(2,846	)		(2,945	)		(37,713	)
State		7,279			463			(9,059	)
Foreign		194			(225	)		(1,055	)
Total deferred		4,627			(2,707	)		(47,827	)
Other non-current
Federal		29,678			27,115			7,797
State		2,990			2,383			1,907
Foreign		(7	)		19			173
Total other		32,661			29,517			9,877
Total income tax expense	$	392,798		$	185,106		$	104,343

Schedule of reconciliation of income taxes computed at the statutory federal tax rate to income tax expense

        Presented below is a reconciliation of income taxes computed at the statutory federal tax rate to income tax expense as reported (in thousands):

	Year Ended December 31,
	2015			2014			2013
Federal tax provision computed at 35%	$	365,476		$	183,813		$	97,616
State tax provision, net of federal tax provision		28,760			12,865			8,320
General business credits		(6,904	)		(12,195	)		(13,346	)
Incentive stock option expense		—			(181	)		(304	)
Section 199 deduction		(21,774	)		(11,735	)		(10,861	)
Nondeductible compensation expense		29,280			13,000			22,813
Nondeductible expenses		(2,040	)		(461	)		105
Total income tax expense	$	392,798		$	185,106		$	104,343

Schedule of components of net deferred tax asset

        Components of the net deferred tax asset are as follows (in thousands):

	As of December 31,
	2015			2014
Deferred tax assets:
General business credits	$	—		$	2,186
Impairment losses on investments		294			291
License fees capitalized for tax purposes		53,439			61,770
Nonqualified stock options		37,424			42,697
SERP		17,141			17,478
STAP awards		95,152			86,414
Other		27,074			29,086
Total deferred tax assets		230,524			239,922
Deferred tax liabilities:
Plant and equipment principally due to differences in depreciation		(26,461	)		(30,758	)
Other		(7,995	)		(7,854	)
Net deferred tax asset before valuation allowance		196,068			201,310
Valuation allowance		(3,392	)		(2,981	)
Net deferred tax assets	$	192,676		$	198,329

Schedule of reconciliation of beginning and ending balances of unrecognized tax benefit

        A reconciliation of the beginning and ending balances of unrecognized tax benefits for the years indicated is as follows (in thousands):

Unrecognized tax benefits at January 1, 2013	$	1,511
Gross increases—tax positions in prior period		1,325
Unrecognized tax benefits at December 31, 2013	$	2,836
Unrecognized tax benefits at January 1, 2014	$	2,836
Gross increases—tax positions in prior period		28
Gross decreases—tax positions in prior period		(1,419	)
Unrecognized tax benefits at December 31, 2014	$	1,445
Unrecognized tax benefits at January 1, 2015	$	1,445
Lapse of statute of limitations		(945	)
Unrecognized tax benefits at December 31, 2015	$	500