Income Taxes (Tables)

12 Months Ended

Dec. 31, 2015

Income Tax Disclosure [Abstract]

Schedule of Components of Income Tax Expense (Benefit)

The amounts provided for income taxes are as follows:

	Year Ended December 31,
	2015			2014		2013
Current:
U.S. Federal	$	40,542		$	8,809	$	20,808
State	13,886			2,416		3,521
	$	54,428		$	11,225	$	24,329
Deferred:
U.S. Federal	$	(9,943	)	$	16,484	$	(372	)
State	(3,252		)	5,456		(285		)
	(13,195		)	21,940		(657		)
Total	$	41,233		$	33,165	$	23,672

Schedule of Deferred Tax Assets and Liabilities

The tax effect of temporary differences which give rise to a significant portion of deferred tax assets and liabilities are as follows:

	December 31, 2015			December 31, 2014
Deferred tax assets:
Employee benefit accruals	$	16,201		$	11,678
Impairment of investments	4,332			—
Impact of timing of settlement payments	39,840			33,485
Various U.S. state tax loss carryforwards	6,713			8,339
Other	—			—
	67,086			53,502
Less: Valuation allowance	(3,900		)	(4,933		)
Net deferred tax assets	$	63,186		$	48,569
Deferred tax liabilities:
Excess of tax basis over book-basis non-consolidated entities	$	(7,292	)	$	(6,190	)
Book/tax differences on fixed and Intangible assets	(52,598		)	(52,972		)
Capitalized interest expense	(4,080		)	—
Book/tax differences on inventory	(16,891		)	(20,062		)
Book/tax differences on long-term investments	(29,701		)	(32,756		)
Impact of accounting on convertible debt	(30,494		)	(31,033		)
Other	(1,559		)	(1,460		)
	$	(142,615	)	$	(144,473	)
Net deferred tax liabilities	$	(79,429	)	$	(95,904	)

Schedule of Effective Income Tax Rate Reconciliation

Differences between the amounts provided for income taxes and amounts computed at the federal statutory tax rate are summarized as follows:

	Year Ended December 31,
	2015			2014			2013
Income before income taxes	$	107,705		$	82,279		$	60,720
Federal income tax expense at statutory rate	37,697			28,798			21,252
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	6,862			4,804			2,050
Impact of non-controlling interest	(2,516		)	(4,290		)	88
Non-deductible expenses	2,941			2,581			2,698
Impact of domestic production deduction	(3,436		)	(248		)	(1,889		)
Tax credits	(265		)	(275		)	(433		)
Other	152			—			—
Inclusion of tax liabilities from unincorporated entities	831			1,374			—
Changes in valuation allowance, net of equity and tax audit adjustments	(1,033		)	421			(94		)
Income tax expense	$	41,233		$	33,165		$	23,672

Summary of Income Tax Contingencies

The following table summarizes the activity related to the unrecognized tax benefits:

Balance at January 1, 2013	$	6,269
Additions based on tax positions related to prior years	179
Settlements	(250		)
Expirations of the statute of limitations	(3,076		)
Balance at December 31, 2013	3,122
Additions based on tax positions related to prior years	318
Settlements	(442		)
Expirations of the statute of limitations	(1,254		)
Balance at December 31, 2014	1,744
Additions based on tax positions related to prior years	265
Settlements	(132		)
Expirations of the statute of limitations	(354		)
Balance at December 31, 2015	$	1,523