Principal Accounting Policies (Tables)

12 Months Ended

Dec. 31, 2011

Principal Accounting Policies [Abstract]

Schedule Of Allowance For Uncollectible Accounts

(Dollars in thousands)			Additions
	Balance at beginning of period		Charged to expense		Charged to other accounts		Write-offs net of recoveries			Balance at end of period
2011	$	6,209	$	6,761	$	--	$	(6,019	)	$	6,951
2010	$	3,456	$	7,319	$	--	$	(4,566	)	$	6,209
2009	$	5,248	$	8,007	$	--	$	(9,799	)	$	3,456

Schedule Of Allowance For Revenue Adjustments

(Dollars in thousands)			Additions
	Balance at beginning of period		Charged to expense		Charged to other accounts - Revenue		Write-offs			Balance at end of period
2011	$	14,291	$	--	$	86,853	$	(84,224	)	$	16,920
2010	$	14,454	$	--	$	85,272	$	(85,435	)	$	14,291
2009	$	13,758	$	--	$	83,122	$	(82,426	)	$	14,454

Calculation Of Numerator And Denominator In Earnings Per Share

(Dollars in thousands except per share data)	Years ended December 31,
	2011		2010		2009
Numerator:
Net income (loss) applicable to common      shareholders, as reported	$	88,443	$	3,985	$	(110,936	)
Denominator:
Weighted-average common shares outstanding		55,388,297		52,507,320		47,525,862
Stock options and nonvested stock		713,606		661,979		--
		56,101,903		53,169,299		47,525,862
Diluted Earnings (Loss) per Share:	$	1.58	$	0.07	$	(2.33	)
Antidilutive securities excluded from the computation
of diluted EPS		1,878,191		1,582,355		5,025,354