Income Taxes (Tables)

12 Months Ended

Dec. 31, 2013

Income Tax Disclosure [Abstract]

Schedule Of Income Tax Expense

(Dollars in thousands)	Years ended December 31,
	2013			2012			2011
Current provision (benefit)
Federal	$	(6,137	)	$	3,872		$	3,804
State and local	2,145			34			4,156
Foreign	873			2,566			2,228
Total current provision (benefit)	(3,119		)	6,472			10,188
Deferred provision (benefit)
Federal	41,832			45,920			85,106
Federal net operating loss	14,369			11,166			(40,057		)
State and local	5,608			5,270			4,544
Foreign	(3,478		)	(2,420		)	(152		)
Total deferred provision	58,331			59,936			49,441
Income tax provision	$	55,212		$	66,408		$	59,629

Schedule of Income before Income Tax, Domestic and Foreign

(Dollars in thousands)	Years ended December 31,
	2013			2012		2011
U.S. sources	$	157,074		$	164,619	$	139,978
Non-U.S. sources	(2,709		)	6,335		8,094
Income before income tax provision	$	154,365		$	170,954	$	148,072

Schedule Of Income Taxes Calculated On Income Before Income Taxes And Provision For Income Taxes

	Years ended December 31,
	2013		2012		2011
Federal statutory tax rate of 35%	35.0	%	35.0	%	35.0	%
State income tax, net of federal income tax benefit	4.7		3.1		5.0
Foreign taxes less than U.S. statutory rate	(1.1	)	(1.2	)	(0.5	)
Non-deductible operating expenses and tax-exempt income	0.7		—		0.1
Foreign taxes eligible for US foreign tax credit	0.5		0.5		0.6
Write-down of an acquisition-related receivable and
purchase-price adjustment	—		—		(1.6	)
Fuel tax credit	(4.5	)	(0.1	)	(2.5	)
IRS audit	(0.4	)	1.5		4.0
Other, net	0.9		—		0.2
Effective income tax rate	35.8	%	38.8	%	40.3	%

Schedule Of Deferred Tax Assets And Liabilities

(Dollars in thousands)	December 31,
	2013			2012
Deferred tax assets
Employee benefits	$	91,474		$	231,386
Self-insurance accruals	23,042			32,336
Domestic operating-loss carryforwards	22,461			37,818
Foreign operating-loss carryforwards	16,832			11,307
Tax-credit carryforwards	10,019			9,138
Share-based compensation	16,551			15,558
Other	11,471			13,242
Valuation allowance	(25,358		)	(19,120		)
Total deferred tax assets	166,492			331,665
Deferred tax liabilities
Property, plant and equipment	348,728			331,325
Prepaid expenses	24,401			27,626
Revenue	9,013			6,808
Other	6,967			8,798
Total deferred tax liabilities	389,109			374,557
Net deferred tax asset (liability)	$	(222,617	)	$	(42,892	)

Schedule Of Unrecognized Tax Benefits

(Dollars in thousands)
Balance at December 31, 2011	$	10,677
Gross increases — prior-period tax positions	2,676
Gross increases — current-period tax positions	1,039
Settlements	(1,102		)
Lapse of statute of limitations	(3,562		)
Balance at December 31, 2012	9,728
Gross increases — prior-period tax positions	14
Gross increases — current-period tax positions	1,376
Gross decreases — prior-period tax positions	(602		)
Lapse of statute of limitations	(2,128		)
Balance at December 31, 2013	$	8,388