Income Taxes (Tables)

12 Months Ended

Dec. 31, 2012

Income Tax Disclosure [Abstract]

Schedule Of Income Tax Expense

(Dollars in thousands)	Years ended December 31,
	2012			2011			2010
Current provision (benefit)
Federal	$	3,872		$	3,804		$	(52,792	)
State and local	34			4,156			179
Foreign	2,566			2,228			1,589
	6,472			10,188			(51,024		)
Deferred provision (benefit)
Federal	45,920			85,106			63,509
Federal net operating loss	11,166			(40,057		)	—
State and local	5,270			4,544			2,533
Foreign	(2,420		)	(152		)	(2,446		)
	59,936			49,441			63,596
	$	66,408		$	59,629		$	12,572

Schedule of Income before Income Tax, Domestic and Foreign

(Dollars in thousands)	Years ended December 31,
	2012		2011		2010
U.S. sources	$	164,619	$	139,978	$	30,706
Non-U.S. sources	6,335		8,094		(14,149		)
	$	170,954	$	148,072	$	16,557

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

	Years ended December 31,
	2012		2011		2010
Federal statutory tax rate of 35%	35.0		35.0		35.0
State income tax, net of federal income tax benefit	3.1		5.0		15.7
Foreign taxes in excess of (less than) U.S. statutory rate	(1.2	)	(0.5	)	(9.7	)
Non-deductible operating expenses and tax-exempt income	—		0.1		5.3
Creditable foreign tax, net of foreign tax credits	0.5		0.6		3.8
Non-deductible goodwill impairment, write-down of an
acquisition-related receivable and purchase-price adjustment	—		(1.6	)	34.7
Fuel tax credit	(0.1	)	(2.5	)	(24.5	)
IRS audit settlement	—		4.0		—
Other, net	1.5		0.2		15.6
Effective income tax rate	38.8		40.3		75.9

Schedule Of Deferred Tax Assets And Liabilities

(Dollars in thousands)	December 31,
	2012			2011
Deferred tax assets
Employee benefits	$	231,386		$	248,481
Self-insurance accruals	32,336			37,426
Capital-loss carryforwards	—			695
Operating-loss carryforwards	49,125			57,635
Tax-credit carryforwards	9,138			6,877
Share-based compensation	15,558			13,724
Other	13,242			14,350
Valuation allowance	(19,120		)	(17,515		)
	331,665			361,673
Deferred tax liabilities
Property, plant and equipment	331,325			313,041
Prepaid expenses	27,626			25,056
Revenue	6,808			6,939
Other	8,798			8,269
	374,557			353,305
Net deferred tax asset (liability)	$	(42,892	)	$	8,368

Schedule Of Unrecognized Tax Benefits

(Dollars in thousands)
Balance at December 31, 2010	$	9,803
Gross increases — prior-period tax positions	2,770
Gross increases — current-period tax positions	1,014
Settlements	(1,758		)
Lapse of statute of limitations	(1,152		)
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