Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2011	Dec. 31, 2010	Dec. 31, 2009	Dec. 31, 2008
Current assets:
Cash and cash equivalents - unrestricted	$ 44,388	$ 124,398	$ 180,029	$ 1,036
Cash and cash equivalents - restricted	1,150	1,150
Trade receivables, less allowance of $719 and $882, respectively	41,939	31,793
Estimated fair value of derivative assets	0	22
Deferred income taxes	8,641	6,495
Other current assets	48,538	48,992
Total current assets	144,656	212,850
Property and equipment, net of accumulated depreciation	2,209,127	2,201,445
Notes receivable, net of current portion	142,567	142,651
Long-term deferred financing costs	15,947	12,521
Other long-term assets	50,713	51,065
Long-term assets of discontinued operations	390	401
Total assets	2,563,400	2,620,933
Current liabilities:
Current portion of long-term debt and capital lease obligations	755	58,574
Accounts payable and accrued liabilities	168,975	175,343
Estimated fair value of derivative liabilities	0	12,475
Current liabilities of discontinued operations	186	357
Total current liabilities	169,916	246,749
Long-term debt and capital lease obligations, net of current portion	1,073,070	1,100,641
Deferred income taxes	108,219	101,140
Other long-term liabilities	166,209	142,200
Long-term liabilities of discontinued operations	451	451
Commitments and contingencies
Stockholders' equity:
Preferred stock, $.01 par value, 100,000 shares authorized, no shares issued or outstanding
Common stock, $.01 par value, 150,000 shares authorized, 48,428 and 48,144 shares issued and outstanding, respectively	484	481
Additional paid-in capital	929,904	916,359
Treasury stock of 385 shares, at cost	(4,599)	(4,599)
Retained earnings	155,777	145,600
Accumulated other comprehensive loss	(36,031)	(28,089)
Total stockholders' equity	1,045,535	1,029,752	1,078,684	903,219
Total liabilities and stockholders' equity	$ 2,563,400	$ 2,620,933