Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2018	Dec. 31, 2017
ASSETS
Cash and cash equivalents	$ 71,368	$ 52,183
Restricted cash	5,163
Accounts receivable, net of allowance of $846 and $782, respectively	217,857	254,188
Prepaid expenses and other current assets	32,401	21,119
Assets held for sale	12,600
Total current assets	339,389	327,490
Property and equipment, net of accumulated depreciation of $1,538,351 and $1,475,951, respectively	2,802,146	2,802,449
Goodwill	43,996	40,927
Non-current deferred tax assets	11,531	12,814
Other assets	95,715	88,718
Total assets	3,292,777	3,272,398
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	277,928	277,804
Income taxes payable	200	3,034
Current portion of long-term debt	6,193	10,000
Total current liabilities	284,321	290,838
Long-term debt, net	1,487,781	1,437,187
Deferred revenue	32,918	39,735
Other liabilities	59,839	53,030
Total liabilities	1,864,859	1,820,790
Commitments and contingencies
Preferred stock – $0.01 par value; 50,000 shares authorized; none issued and outstanding at June 30, 2018 and December 31, 2017, respectively	0	0
Common stock – $0.01 par value; 300,000 shares authorized; 118,548 and 118,204 shares issued and outstanding at June 30, 2018 and December 31, 2017, respectively	1,185	1,182
Additional paid-in capital	1,799,632	1,794,713
Accumulated deficit	(372,899)	(344,287)
Total stockholders' equity	1,427,918	1,451,608
Total liabilities and stockholders' equity	$ 3,292,777	$ 3,272,398