Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Dec. 31, 2011	Dec. 31, 2010
ASSETS
Cash and cash equivalents	$ 55,832	$ 25,505
Accounts receivable, net of allowance of $1,218 and $1,568, respectively	271,217	305,305
Deferred tax assets	11,768	14,132
Prepaid expenses and other current assets	18,764	31,196
Current assets of discontinued operations	1,848	2,155
Total current assets	359,429	378,293
Property and equipment, net	2,608,918	2,549,295
Restricted cash	5,013	6,756
Investment in direct financing lease	9,233	10,798
Goodwill	11,988	11,988
Other assets	25,050	26,092
Non-current assets of discontinued operations		6
Total assets	3,019,631	2,983,228
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	196,667	203,796
Income taxes payable	605	476
Current liabilities of discontinued operations	1,090	1,583
Total current liabilities	198,362	205,855
Long-term debt	1,245,014	1,156,568
Deferred tax liabilities	136,503	118,245
Other liabilities	31,730	31,689
Total liabilities	1,611,609	1,512,357
Commitments and contingencies
Preferred stock-$0.01 par value; 50,000 shares authorized; none issued and outstanding at December 31, 2011 and 2010, respectively
Common stock - $0.01 par value; 300,000 shares authorized; 99,528 and 109,754 shares issued and outstanding at December 31, 2011 and 2010, respectively	995	1,098
Additional paid-in capital	1,129,435	1,354,691
Retained earnings	277,592	115,082
Total stockholders' equity	1,408,022	1,470,871
Total liabilities and stockholders' equity	$ 3,019,631	$ 2,983,228