Income Taxes (Tables)

12 Months Ended

Dec. 31, 2010

Income Tax [Abstract]

Income tax expense

Year Ended December 31,		2010			2009		2008
(Dollars in thousands)
Current
	Federal	$	19,290		$	69,942	$	76,305
	State		(11,059	)		648		10,089
Deferred
	Federal		57,759			41,884		(49,428	)
	State		15,968			5,376		(27,899	)
		$	81,958		$	117,850	$	9,067

Income tax reconciliation

Year Ended December 31,		2010					2009					2008
		Amount			Rate		Amount			Rate		Amount			Rate
(Dollars in millions)
Statutory federal income tax expense and rate		$	84.4		35.0	%	$	122.2		35.0	%	$	24.4		35.0	%
State income taxes, net of federal benefit			5.0		2.1			0.1		0.1			(10.5	)	(15.1	)
Effect of noncontrolling interests			(4.6	)	(1.9	)		(4.8	)	(1.4	)		(4.5	)	(6.4	)
Effect of gains (losses) on investments,
	sales of assets and impairment of assets		—		—			—		—			1.3		1.8
Other differences, net			(2.8	)	(1.2	)		0.4		0.1			(1.6	)	(2.3	)
Effective income tax expense and rate		$	82.0		34.0	%	$	117.9		33.8	%	$	9.1		13.0	%

Temporary income tax differences

December 31,		2010			2009
(Dollars in thousands)
Noncurrent deferred tax assets
	Net operating loss ("NOL") carryforwards	$	33,724		$	26,884
	Stock-based compensation		17,204			15,526
	Other		38,998			35,584
			89,926			77,994
	Less valuation allowance		(28,252	)		(17,977	)
	Total noncurrent deferred tax assets		61,674			60,017
Noncurrent deferred tax liabilities
	Licenses/intangibles		246,599			221,754
	Property, plant and equipment		323,334			288,094
	Partnership investments		71,566			61,272
	Other		3,619			4,217
	Total noncurrent deferred tax liabilities		645,118			575,337
Net noncurrent deferred income tax liability		$	583,444		$	515,320

Income tax unrecognized benefits summary

		2010			2009			2008
(Dollars in thousands)
Balance at January 1,		$	34,442		$	27,786		$	33,890
	Additions for tax positions of current year		5,119			4,966			4,858
	Additions for tax positions of prior years		550			3,114			692
	Reductions for tax positions of prior years		(1,560	)		(1,399	)		(5,320	)
	Reductions for settlements of tax positions		(5,938	)		—			(3,177	)
	Reductions for lapses in statutes of limitations		(66	)		(25	)		(3,157	)
Balance at December 31,		$	32,547		$	34,442		$	27,786