CONDENSED CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Sep. 30, 2012	Dec. 31, 2011	Sep. 30, 2011	Dec. 31, 2010
Current assets:
Cash and cash equivalents - unrestricted	$ 24,230	$ 44,388	$ 12,122	$ 124,398
Cash and cash equivalents - restricted	1,150	1,150
Trade receivables, less allowance of $597 and $719, respectively	60,369	41,939
Deferred income taxes	546	8,641
Other current assets	53,167	48,538
Total current assets	139,462	144,656
Property and equipment, net of accumulated depreciation	2,172,788	2,209,127
Notes receivable, net of current portion	137,542	142,567
Long-term deferred financing costs	12,572	15,947
Other long-term assets	46,736	50,713
Long-term assets of discontinued operations	346	390
Total assets	2,509,446	2,563,400
Current liabilities:
Current portion of long-term debt and capital lease obligations	99,537	755
Accounts payable and accrued liabilities	196,245	168,975
Current liabilities of discontinued operations	217	186
Total current liabilities	295,999	169,916
Long-term debt and capital lease obligations, net of current portion	1,048,924	1,073,070
Deferred income taxes	98,345	108,219
Other long-term liabilities	172,052	166,209
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	0	0
Common stock, $.01 par value, 150,000 shares authorized, 45,302 and 48,428 shares issued and outstanding, respectively	453	484
Additional paid-in capital	975,117	929,904
Treasury stock of 385 shares, at cost	(4,599)	(4,599)
Retained earnings (accumulated deficit)	(41,265)	155,777
Accumulated other comprehensive loss	(36,031)	(36,031)
Total stockholders' equity	893,675	1,045,535
Total liabilities and stockholders' equity	$ 2,509,446	$ 2,563,400