Consolidated Statements of Cash Flows (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2012		Dec. 31, 2011		Dec. 31, 2010
Cash Flows from Operating Activities:
Net income	$ 76,335	[1]	$ 6,794	[1]	$ 8,630
Depreciation and amortization	106,317		105,922		109,070
Amortization of debt issuance costs, discounts and premium	5,485		6,290		10,203
Loss on early retirement of debt	0		85,311		0
Stock-based compensation expense	18,253		24,345		14,324
Impairment of goodwill	0		0		21,438
Impairment of other intangible assets	0		0		34,791
Impairment of fixed assets	9,563		245		224
Net loss (gain) on disposition of assets	408		(45)		255
Net change in deferred income taxes	9,230		32,987		2,894
Excess tax benefit from stock option exercises	(75)		0		0
Net change in fair value of swap agreements	0		0		1,015
Net change in deferred compensation liability	2,493		39		1,938
Changes in operating assets and liabilities:
Accounts receivable, net	580		1,990		657
Income tax refunds receivable	(4,495)		1,577		14,109
Inventories	683		581		577
Prepaid expenses	309		191		645
Accounts payable	(10,316)		9,937		(6,636)
Income taxes payable	75		0		0
Accrued liabilities	9,125		(22,815)		4,193
Net cash provided by operating activities	223,970		253,349		218,327
Cash Flows from Investing Activities:
Capital expenditures	(133,137)		(82,629)		(58,396)
Net cash paid for Louisiana acquisition	(33,218)		0		0
Net change in construction contracts payable	12,947		926		(6,489)
Proceeds from sale of assets	523		309		405
(Increase) decrease in restricted cash	(29,670)		0		500
Decrease (increase) in deposits and other non-current assets	1,731		29,111		(5,526)
Net cash used in investing activities	(180,824)		(52,283)		(69,506)
Cash Flows from Financing Activities:
Proceeds from issuance of long-term debt and other borrowings	290,200		2,074,250		12,000
Principal payments of debt	(298,416)		(1,753,835)		(161,794)
Debt issuance and amendment costs	(4,988)		(30,799)		(133)
Cash dividends paid	(16,448)		(16,419)		(24,389)
Proceeds from stock option exercises and restricted share issuances	4,689		7,274		2,238
Purchases of treasury stock	(14,585)		(467,002)		(1,638)
Tax effect from stock-based arrangements	75		(2)		(412)
Net cash used in financing activities	(39,473)		(186,533)		(174,128)
Net Increase (Decrease) in Cash and Cash Equivalents	3,673		14,533		(25,307)
Cash and Cash Equivalents - Beginning of Year	85,719		71,186		96,493
Cash and Cash Equivalents - End of Year	89,392		85,719		71,186
Supplemental Cash Flow Disclosures:
Cash paid for interest, net of amounts capitalized	101,162		97,482		118,149
Cash paid (received) for federal and state income taxes (net of refunds received)	$ 23,071		$ (6,522)		$ (3,144)

[1] The sum of the amounts for the four quarters does not equal the total for the year due to rounding.