Condensed Consolidating Financial Information (Schedule Of Condensed Consolidating Balance Sheet) (Details) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
Current assets	$ 212,636	$ 206,823
Current assets held for sale	0	1,882
Assets of discontinued operations	18,500	0
Property and equipment, net	1,671,725	1,487,674
Investments in subsidiaries	0	0
LONG-TERM ASSETS HELD FOR SALE	0	132,626
Other assets	34,311	54,991
TOTAL ASSETS	1,937,172	1,883,996
Current liabilities	306,620	250,255
Current liabilities associated with assets held for sale	0	48,663
Liabilities of discontinued operations	14,928	0
Long-term liabilities	983,225	976,515
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE	0	23,547
LIABILITIES OF DISCONTINUED OPERATIONS	15,600	0
Shareholders’ equity (deficit)	616,799	585,016
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	1,937,172	1,883,996
Parent Company [Member]
Current assets	1,767,668	1,689,430
Current assets held for sale		0
Assets of discontinued operations	18,500
Property and equipment, net	18,200	23,041
Investments in subsidiaries	(16,979)	14,588
LONG-TERM ASSETS HELD FOR SALE		12,670
Other assets	37,692	46,913
TOTAL ASSETS	1,825,081	1,786,642
Current liabilities	214,747	179,221
Current liabilities associated with assets held for sale		9,880
Liabilities of discontinued operations	14,928
Long-term liabilities	975,519	973,003
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE		0
LIABILITIES OF DISCONTINUED OPERATIONS	15,600
Shareholders’ equity (deficit)	604,287	624,538
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	1,825,081	1,786,642
Combined Guarantor Subsidiaries [Member]
Current assets	144,291	130,487
Current assets held for sale		0
Assets of discontinued operations	0
Property and equipment, net	1,632,186	1,443,064
Investments in subsidiaries	0	0
LONG-TERM ASSETS HELD FOR SALE		0
Other assets	1,883	16,928
TOTAL ASSETS	1,778,360	1,590,479
Current liabilities	1,791,196	1,631,887
Current liabilities associated with assets held for sale		0
Liabilities of discontinued operations	0
Long-term liabilities	4,143	3,512
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE		0
LIABILITIES OF DISCONTINUED OPERATIONS	0
Shareholders’ equity (deficit)	(16,979)	(44,920)
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	1,778,360	1,590,479
Combined Non-Guarantor Subsidiaries [Member]
Current assets	0	0
Current assets held for sale		1,882
Assets of discontinued operations	0
Property and equipment, net	0	0
Investments in subsidiaries	0	0
LONG-TERM ASSETS HELD FOR SALE		119,956
Other assets	0	0
TOTAL ASSETS	0	121,838
Current liabilities	0	0
Current liabilities associated with assets held for sale		38,783
Liabilities of discontinued operations	0
Long-term liabilities	0	0
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE		23,547
LIABILITIES OF DISCONTINUED OPERATIONS	0
Shareholders’ equity (deficit)	0	59,508
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	0	121,838
Eliminations [Member]
Current assets	(1,699,323)	(1,613,094)
Current assets held for sale		0
Assets of discontinued operations	0
Property and equipment, net	21,339	21,569
Investments in subsidiaries	16,979	(14,588)
LONG-TERM ASSETS HELD FOR SALE		0
Other assets	(5,264)	(8,850)
TOTAL ASSETS	(1,666,269)	(1,614,963)
Current liabilities	(1,699,323)	(1,560,853)
Current liabilities associated with assets held for sale		0
Liabilities of discontinued operations	0
Long-term liabilities	3,563	0
LONG-TERM LIABILITIES ASSOCIATED WITH ASSETS HELD FOR SALE		0
LIABILITIES OF DISCONTINUED OPERATIONS	0
Shareholders’ equity (deficit)	29,491	(54,110)
TOTAL LIABILITIES AND SHAREHOLDERS’ EQUITY	$ (1,666,269)	$ (1,614,963)