Consolidated Balance Sheets - USD ($) $ in Thousands	Mar. 31, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 43,164	$ 37,711
Accounts receivable, net of allowance of $1,619 and $1,580, respectively	213,027	229,885
Prepaid expenses and other current assets	25,391	31,228
Total current assets	281,582	298,824
Property and equipment, net of accumulated depreciation of $1,378,224 and $1,352,323, respectively	2,822,805	2,837,657
Goodwill	38,127	38,386
Non-current deferred tax assets	11,868	13,735
Other assets	86,236	83,002
Total assets	3,240,618	3,271,604
LIABILITIES AND STOCKHOLDERS' EQUITY
Accounts payable and accrued expenses	240,586	260,107
Income taxes payable	2,601	2,086
Current portion of long-term debt	10,000	10,000
Total current liabilities	253,187	272,193
Long-term debt, net	1,421,182	1,435,169
Deferred revenue	50,006	53,437
Other liabilities	53,082	51,842
Total liabilities	1,777,457	1,812,641
Commitments and contingencies
Preferred stock - $0.01 par value; 50,000 shares authorized; none issued and outstanding at March 31, 2017 and December 31, 2016, respectively
Common stock - $0.01 par value; 300,000 shares authorized; 118,140 and 117,554 shares issued and outstanding at March 31, 2017 and December 31, 2016, respectively	1,181	1,176
Additional paid-in capital	1,784,532	1,780,350
Accumulated deficit	(322,552)	(322,563)
Total stockholders' equity	1,463,161	1,458,963
Total liabilities and stockholders' equity	$ 3,240,618	$ 3,271,604