Income Taxes (Tables)

12 Months Ended

Dec. 31, 2014

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,
	2014		2013			2012
Current:
U.S. Federal	$	8,809	$	20,808		$	24,246
State	2,416		3,521			6,185
	$	11,225	$	24,329		$	30,431
Deferred:
U.S. Federal	$	16,557	$	596		$	(5,779	)
State	5,469		(130		)	(1,557		)
	22,026		466			(7,336		)
Total	$	33,251	$	24,795		$	23,095

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, 2014					December 31, 2013
	Deferred Tax Assets			Deferred Tax Liabilities		Deferred Tax Assets			Deferred Tax Liabilities
Excess of tax basis over book-basis non-consolidated entities	$	6,721		$	12,911	$	4,434		$	3,582
Employee benefit accruals	20,768			9,090		19,539			9,378
Book/tax differences on fixed and Intangible assets	—			52,972		—			48,086
Book/tax differences on inventory	—			20,062		—			19,213
Book/tax differences on long-term investments	—			32,756		—			30,898
Impact of accounting on convertible debt	5,360			36,393		9,202			44,823
Impact of timing of settlement payments	33,485			—		56,551			—
Various U.S. state tax loss carryforwards	8,339			—		10,010			—
Other	10,581			39,126		8,231			27,404
Valuation allowance	(4,933		)	—		(6,014		)	—
	$	80,321		$	203,310	$	101,953		$	183,384

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,
	2014			2013			2012
Income before income taxes	$	82,487		$	63,487		$	53,717
Federal income tax expense at statutory rate	28,871			22,221			18,801
Increases (decreases) resulting from:
State income taxes, net of federal income tax benefits	4,817			2,204			3,009
Impact of non-controlling interest	(4,290		)	88			—
Non-deductible expenses	2,581			2,698			3,311
Impact of domestic production deduction	(248		)	(1,889		)	(2,026		)
Tax credits	(275		)	(433		)	—
Inclusion of tax liabilities from unincorporated entities	1,374			—			—
Changes in valuation allowance, net of equity and tax audit adjustments	421			(94		)	—
Income tax expense	$	33,251		$	24,795		$	23,095

Summary of Income Tax Contingencies

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

Balance at January 1, 2012	$	6,597
Additions based on tax positions related to prior years	588
Expirations of the statute of limitations	(916		)
Balance at December 31, 2012	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