Information Concerning Guarantor and Non-Guarantor Subsidiaries (Details 1) (USD $) In Thousands, unless otherwise specified	Mar. 31, 2012	Dec. 31, 2011	Mar. 31, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents - unrestricted	$ 19,862	$ 44,388	$ 86,968	$ 124,398
Cash and cash equivalents - restricted	1,150	1,150
Trade receivables, net	62,975	41,939
Deferred income taxes	6,444	8,641
Other current assets	40,901	48,538
Total current assets	131,332	144,656
Property and equipment, net of accumulated depreciation	2,205,661	2,209,127
Notes receivable, net of current portion	143,849	142,567
Long-term deferred financing costs	14,758	15,947
Other long-term assets	52,693	50,713
Long-term assets of discontinued operations	376	390
Total assets	2,548,669	2,563,400
Current liabilities:
Current portion of long-term debt and capital lease obligations	763	755
Accounts payable and accrued liabilities	153,244	168,975
Current liabilities of discontinued operations	165	186
Total current liabilities	154,172	169,916
Long-term debt and capital lease obligations, net of current portion	1,061,182	1,073,070
Deferred income taxes	110,345	108,219
Other long-term liabilities	169,668	166,209
Long-term liabilities of discontinued operations	451	451
Commitments and Contingencies
Stockholders' equity:
Preferred stock
Common stock	489	484
Additional paid-in capital	931,213	929,904
Treasury stock of 385 shares, at cost	(4,599)	(4,599)
Retained earnings	161,805	155,777
Accumulated other comprehensive loss	(36,057)	(36,031)
Total stockholders' equity	1,052,851	1,045,535
Total liabilities and stockholders' equity	2,548,669	2,563,400
Issuer [Member]
Current assets:
Cash and cash equivalents - unrestricted	16,100	37,562	83,117	117,913
Cash and cash equivalents - restricted	1,150	1,150
Deferred income taxes	164	1,195
Other current assets	(2,970)	2,710
Intercompany receivables, net	1,760,398	1,745,197
Total current assets	1,774,842	1,787,814
Property and equipment, net of accumulated depreciation	46,993	43,733
Long-term deferred financing costs	14,758	15,947
Other long-term assets	663,781	658,167
Total assets	2,500,374	2,505,661
Current liabilities:
Accounts payable and accrued liabilities	13,304	17,934
Total current liabilities	13,304	17,934
Long-term debt and capital lease obligations, net of current portion	1,059,732	1,071,426
Deferred income taxes	(35,216)	(36,586)
Other long-term liabilities	84,709	82,358
Commitments and Contingencies
Stockholders' equity:
Preferred stock
Common stock	489	484
Additional paid-in capital	931,213	929,904
Treasury stock of 385 shares, at cost	(4,599)	(4,599)
Retained earnings	486,799	480,771
Accumulated other comprehensive loss	(36,057)	(36,031)
Total stockholders' equity	1,377,845	1,370,529
Total liabilities and stockholders' equity	2,500,374	2,505,661
Guarantor [Member]
Current assets:
Cash and cash equivalents - unrestricted	3,762	6,826	3,851	6,485
Trade receivables, net	62,975	41,939
Deferred income taxes	6,257	7,423
Other current assets	43,997	45,954
Total current assets	116,991	102,142
Property and equipment, net of accumulated depreciation	2,158,668	2,165,394
Notes receivable, net of current portion	143,849	142,567
Other long-term assets	358,996	359,297
Total assets	2,778,504	2,769,400
Current liabilities:
Current portion of long-term debt and capital lease obligations	763	755
Accounts payable and accrued liabilities	140,357	151,458
Intercompany payables, net	1,976,173	1,958,653
Total current liabilities	2,117,293	2,110,866
Long-term debt and capital lease obligations, net of current portion	1,450	1,644
Deferred income taxes	145,642	144,886
Other long-term liabilities	84,668	83,560
Commitments and Contingencies
Stockholders' equity:
Preferred stock
Common stock	2,388	2,388
Additional paid-in capital	1,081,067	1,081,063
Retained earnings	(654,004)	(655,007)
Total stockholders' equity	429,451	428,444
Total liabilities and stockholders' equity	2,778,504	2,769,400
Non-Guarantor [Member]
Current assets:
Deferred income taxes	23	23
Intercompany receivables, net	306,358	302,368
Total current assets	306,381	302,391
Long-term assets of discontinued operations	376	390
Total assets	306,757	302,781
Current liabilities:
Intercompany payables, net	90,583	88,912
Current liabilities of discontinued operations	165	186
Total current liabilities	90,748	89,098
Deferred income taxes	(81)	(81)
Long-term liabilities of discontinued operations	451	451
Commitments and Contingencies
Stockholders' equity:
Preferred stock
Common stock	1	1
Additional paid-in capital	(40,129)	(40,127)
Retained earnings	255,767	253,439
Total stockholders' equity	215,639	213,313
Total liabilities and stockholders' equity	306,757	302,781
Eliminations [Member]
Current assets:
Other current assets	(126)	(126)
Intercompany receivables, net	(2,066,756)	(2,047,565)
Total current assets	(2,066,882)	(2,047,691)
Other long-term assets	(970,084)	(966,751)
Total assets	(3,036,966)	(3,014,442)
Current liabilities:
Accounts payable and accrued liabilities	(417)	(417)
Intercompany payables, net	(2,066,756)	(2,047,565)
Total current liabilities	(2,067,173)	(2,047,982)
Other long-term liabilities	291	291
Commitments and Contingencies
Stockholders' equity:
Preferred stock
Common stock	(2,389)	(2,389)
Additional paid-in capital	(1,040,938)	(1,040,936)
Retained earnings	73,243	76,574
Total stockholders' equity	(970,084)	(966,751)
Total liabilities and stockholders' equity	$ (3,036,966)	$ (3,014,442)