CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Dec. 31, 2012	Dec. 31, 2011
ASSETS
Cash and cash equivalents	$ 62,897	$ 55,802
Accounts receivable, net of allowance of $2,578 and $1,218, respectively	252,764	269,685
Deferred tax assets	8,022	11,768
Prepaid expenses and other current assets	27,059	18,676
Current assets of discontinued operations		3,498
Total current assets	350,742	359,429
Property and equipment, net	2,568,791	2,608,740
Restricted cash	5,022	5,013
Investment in direct financing lease	7,467	9,233
Goodwill	11,988	11,988
Other assets	30,732	25,047
Non-current assets of discontinued operations		181
Total assets	2,974,742	3,019,631
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	166,000	195,726
Income taxes payable	102	605
Current liabilities of discontinued operations	356	2,031
Total current liabilities	166,458	198,362
Long-term debt	1,111,545	1,245,014
Deferred tax liabilities	139,526	136,503
Other liabilities	35,593	31,730
Total liabilities	1,453,122	1,611,609
Commitments and contingencies
Preferred stock-$0.01 par value; 50,000 shares authorized; none issued and outstanding at December 31, 2012 and 2011, respectively
Common stock-$0.01 par value; 300,000 shares authorized; 100,105 and 99,528 shares issued and outstanding at December 31, 2012 and 2011, respectively	1,001	995
Additional paid-in capital	1,146,488	1,129,435
Retained earnings	374,131	277,592
Total stockholders' equity	1,521,620	1,408,022
Total liabilities and stockholders' equity	$ 2,974,742	$ 3,019,631