CONSOLIDATED BALANCE SHEETS (USD $) In Thousands, unless otherwise specified	Mar. 31, 2013	Dec. 31, 2012
ASSETS
Cash and cash equivalents	$ 60,330	$ 62,897
Accounts receivable, net of allowance of $2,138 and $2,578, respectively	232,863	252,764
Current deferred tax assets	5,360	8,022
Prepaid expenses and other current assets	20,048	27,059
Total current assets	318,601	350,742
Property and equipment, net	2,551,961	2,568,791
Restricted cash	5,023	5,022
Investment in direct financing lease	6,991	7,467
Goodwill	11,988	11,988
Other assets	35,813	30,732
Non-current deferred tax assets	5,998
Total assets	2,936,375	2,974,742
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	216,279	166,000
Income taxes payable	2,352	102
Current liabilities of discontinued operations	79	356
Total current liabilities	218,710	166,458
Long-term debt	1,016,948	1,111,545
Deferred tax liabilities		139,526
Other liabilities	38,815	35,593
Total liabilities	1,274,473	1,453,122
Commitments and contingencies
Preferred stock - $0.01 par value; 50,000 shares authorized; none issued and outstanding at March 31, 2013 and December 31, 2012, respectively
Common stock - $0.01 par value; 300,000 shares authorized; 101,102 and 100,105 shares issued and outstanding at March 31, 2013 and December 31, 2012, respectively	1,011	1,001
Additional paid-in capital	1,159,512	1,146,488
Retained earnings	501,379	374,131
Total stockholders' equity	1,661,902	1,521,620
Total liabilities and stockholders' equity	$ 2,936,375	$ 2,974,742