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Information Concerning Guarantor and Non Guarantor Subsidiaries (Details 1) (USD $)
In Thousands
9 Months Ended12 Months Ended
Sep. 30, 2011
Sep. 30, 2010
Dec. 31, 2010
Dec. 31, 2009
Current assets:    
Cash and cash equivalents - unrestricted$ 12,122$ 135,946$ 124,398$ 180,029
Cash and cash equivalents - restricted1,150 1,150 
Trade receivables, net49,871 31,793 
Estimated fair value of derivative assets0 22 
Deferred income taxes5,544 6,495 
Other current assets59,123 48,992 
Intercompany receivables, net0 0 
Total current assets127,810 212,850 
Property and equipment, net of accumulated depreciation2,200,192 2,201,445 
Notes receivable, net of current portion141,742 142,651 
Long-term deferred financing costs17,169 12,521 
Other long-term assets51,428 51,065 
Long-term assets of discontinued operations401 401 
Total assets2,538,742 2,620,933 
Current liabilities:    
Current portion of long-term debt and capital lease obligations746 58,574 
Accounts payable and accrued liabilities161,355 175,343 
Estimated fair value of derivative liabilities345 12,475 
Intercompany payables, net0 0 
Current liabilities of discontinued operations281 357 
Total current liabilities162,727 246,749 
Long-term debt and capital lease obligations, net of current portion1,069,956 1,100,641 
Deferred income taxes110,902 101,140 
Other long-term liabilities141,751 142,200 
Long-term liabilities of discontinued operations451 451 
Commitments and contingencies    
Stockholders' equity:    
Preferred stock    
Common stock484 481 
Additional paid-in capital926,668 916,359 
Treasury stock of 385 shares, at cost(4,599) (4,599) 
Retained earnings150,674 145,600 
Accumulated other comprehensive loss(20,272) (28,089) 
Total stockholders' equity1,052,955 1,029,752 
Total liabilities and stockholders' equity2,538,742 2,620,933 
Parent Company [Member]
    
Current assets:    
Cash and cash equivalents - unrestricted8,378131,007117,913175,871
Cash and cash equivalents - restricted1,150 1,150 
Trade receivables, net0 0 
Estimated fair value of derivative assets  22 
Deferred income taxes104 67 
Other current assets4,094 3,364 
Intercompany receivables, net1,765,720 1,744,290 
Total current assets1,779,446 1,866,806 
Property and equipment, net of accumulated depreciation41,373 38,686 
Notes receivable, net of current portion0 0 
Long-term deferred financing costs17,169 12,521 
Other long-term assets658,339 654,722 
Long-term assets of discontinued operations0 0 
Total assets2,496,327 2,572,735 
Current liabilities:    
Current portion of long-term debt and capital lease obligations0 58,396 
Accounts payable and accrued liabilities12,599 14,622 
Estimated fair value of derivative liabilities345 12,475 
Intercompany payables, net0 0 
Current liabilities of discontinued operations0 0 
Total current liabilities12,944 85,493 
Long-term debt and capital lease obligations, net of current portion1,068,121 1,100,335 
Deferred income taxes(20,244) (26,398) 
Other long-term liabilities57,557 58,559 
Long-term liabilities of discontinued operations0 0 
Commitments and contingencies    
Stockholders' equity:    
Preferred stock    
Common stock484 481 
Additional paid-in capital926,668 916,359 
Treasury stock of 385 shares, at cost(4,599) (4,599) 
Retained earnings475,668 470,594 
Accumulated other comprehensive loss(20,272) (28,089) 
Total stockholders' equity1,377,949 1,354,746 
Total liabilities and stockholders' equity2,496,327 2,572,735 
Guarantor Subsidiaries [Member]
    
Current assets:    
Cash and cash equivalents - unrestricted3,7444,9396,4854,158
Cash and cash equivalents - restricted0 0 
Trade receivables, net49,871 31,793 
Estimated fair value of derivative assets  0 
Deferred income taxes4,760 5,748 
Other current assets55,155 45,754 
Intercompany receivables, net0 0 
Total current assets113,530 89,780 
Property and equipment, net of accumulated depreciation2,158,819 2,162,759 
Notes receivable, net of current portion141,742 142,651 
Long-term deferred financing costs0 0 
Other long-term assets360,813 362,282 
Long-term assets of discontinued operations0 0 
Total assets2,774,904 2,757,472 
Current liabilities:    
Current portion of long-term debt and capital lease obligations746 178 
Accounts payable and accrued liabilities149,177 161,142 
Estimated fair value of derivative liabilities0 0 
Intercompany payables, net1,975,152 1,947,054 
Current liabilities of discontinued operations0 0 
Total current liabilities2,125,075 2,108,374 
Long-term debt and capital lease obligations, net of current portion1,835 306 
Deferred income taxes131,375 127,768 
Other long-term liabilities83,899 83,346 
Long-term liabilities of discontinued operations0 0 
Commitments and contingencies    
Stockholders' equity:    
Preferred stock    
Common stock2,388 2,388 
Additional paid-in capital1,081,063 1,081,056 
Treasury stock of 385 shares, at cost0 0 
Retained earnings(650,731) (645,766) 
Accumulated other comprehensive loss0 0 
Total stockholders' equity432,720 437,678 
Total liabilities and stockholders' equity2,774,904 2,757,472 
Non-Guarantor Subsidiaries [Member]
    
Current assets:    
Cash and cash equivalents - unrestricted0 0 
Cash and cash equivalents - restricted0 0 
Trade receivables, net0 0 
Estimated fair value of derivative assets  0 
Deferred income taxes680 680 
Other current assets0 0 
Intercompany receivables, net298,403 287,087 
Total current assets299,083 287,767 
Property and equipment, net of accumulated depreciation0 0 
Notes receivable, net of current portion0 0 
Long-term deferred financing costs0 0 
Other long-term assets0 0 
Long-term assets of discontinued operations401 401 
Total assets299,484 288,168 
Current liabilities:    
Current portion of long-term debt and capital lease obligations0 0 
Accounts payable and accrued liabilities0 0 
Estimated fair value of derivative liabilities0 0 
Intercompany payables, net88,971 84,323 
Current liabilities of discontinued operations281 357 
Total current liabilities89,252 84,680 
Long-term debt and capital lease obligations, net of current portion0 0 
Deferred income taxes(229) (230) 
Other long-term liabilities0 0 
Long-term liabilities of discontinued operations451 451 
Commitments and contingencies    
Stockholders' equity:    
Preferred stock    
Common stock1 1 
Additional paid-in capital(40,127) (40,120) 
Treasury stock of 385 shares, at cost0 0 
Retained earnings250,136 243,386 
Accumulated other comprehensive loss0 0 
Total stockholders' equity210,010 203,267 
Total liabilities and stockholders' equity299,484 288,168 
Consolidation, Eliminations [Member]
    
Current assets:    
Cash and cash equivalents - unrestricted0 0 
Cash and cash equivalents - restricted0 0 
Trade receivables, net0 0 
Estimated fair value of derivative assets  0 
Deferred income taxes0 0 
Other current assets(126) (126) 
Intercompany receivables, net(2,064,123) (2,031,377) 
Total current assets(2,064,249) (2,031,503) 
Property and equipment, net of accumulated depreciation0 0 
Notes receivable, net of current portion0 0 
Long-term deferred financing costs0 0 
Other long-term assets(967,724) (965,939) 
Long-term assets of discontinued operations0 0 
Total assets(3,031,973) (2,997,442) 
Current liabilities:    
Current portion of long-term debt and capital lease obligations0 0 
Accounts payable and accrued liabilities(421) (421) 
Estimated fair value of derivative liabilities0 0 
Intercompany payables, net(2,064,123) (2,031,377) 
Current liabilities of discontinued operations0 0 
Total current liabilities(2,064,544) (2,031,798) 
Long-term debt and capital lease obligations, net of current portion0 0 
Deferred income taxes0 0 
Other long-term liabilities295 295 
Long-term liabilities of discontinued operations0 0 
Commitments and contingencies    
Stockholders' equity:    
Preferred stock    
Common stock(2,389) (2,389) 
Additional paid-in capital(1,040,936) (1,040,936) 
Treasury stock of 385 shares, at cost0 0 
Retained earnings75,601 77,386 
Accumulated other comprehensive loss0 0 
Total stockholders' equity(967,724) (965,939) 
Total liabilities and stockholders' equity$ (3,031,973) $ (2,997,442)