Consolidated Balance Sheets - USD ($) $ in Thousands	Sep. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 93,625	$ 52,183
Restricted cash	11,103
Accounts receivable, net of allowance of $919 and $782, respectively	234,162	254,188
Prepaid expenses and other current assets	27,965	21,119
Total current assets	366,855	327,490
Property and equipment, net of accumulated depreciation of $1,576,128 and $1,475,951, respectively	3,023,963	2,802,449
Goodwill	43,996	40,927
Non-current deferred tax assets	14,309	12,814
Other assets	134,909	88,718
Total assets	3,584,032	3,272,398
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	307,689	277,804
Income taxes payable	1,375	3,034
Current portion of long-term debt	12,795	10,000
Total current liabilities	321,859	290,838
Long-term debt, net	1,752,185	1,437,187
Deferred revenue	29,510	39,735
Other liabilities	58,403	53,030
Total liabilities	2,161,957	1,820,790
Commitments and contingencies
Preferred stock – $0.01 par value; 50,000 shares authorized; none issued and outstanding at September 30, 2018 and December 31, 2017, respectively	0	0
Common stock – $0.01 par value; 300,000 shares authorized; 118,670 and 118,204 shares issued and outstanding at September 30, 2018 and December 31, 2017, respectively	1,187	1,182
Additional paid-in capital	1,803,903	1,794,713
Accumulated deficit	(383,015)	(344,287)
Total stockholders' equity	1,422,075	1,451,608
Total liabilities and stockholders' equity	$ 3,584,032	$ 3,272,398