Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2017	Dec. 31, 2016
ASSETS
Cash and cash equivalents	$ 46,584	$ 37,711
Accounts receivable, net of allowance of $666 and $1,580, respectively	206,848	229,885
Prepaid expenses and other current assets	25,620	31,228
Total current assets	279,052	298,824
Property and equipment, net of accumulated depreciation of $1,413,136 and $1,352,323, respectively	2,806,078	2,837,657
Goodwill	40,402	38,386
Non-current deferred tax assets	11,537	13,735
Other assets	87,247	83,002
Total assets	3,224,316	3,271,604
LIABILITIES AND STOCKHOLDERS’ EQUITY
Accounts payable and accrued expenses	243,975	260,107
Income taxes payable	853	2,086
Current portion of long-term debt	10,000	10,000
Total current liabilities	254,828	272,193
Long-term debt, net	1,407,196	1,435,169
Deferred revenue	46,574	53,437
Other liabilities	52,374	51,842
Total liabilities	1,760,972	1,812,641
Commitments and contingencies
Preferred stock – $0.01 par value; 50,000 shares authorized; none issued and outstanding at June 30, 2017 and December 31, 2016, respectively	0	0
Common stock – $0.01 par value; 300,000 shares authorized; 118,179 and 117,554 shares issued and outstanding at June 30, 2017 and December 31, 2016, respectively	1,182	1,176
Additional paid-in capital	1,789,337	1,780,350
Accumulated deficit	(327,175)	(322,563)
Total stockholders’ equity	1,463,344	1,458,963
Total liabilities and stockholders’ equity	$ 3,224,316	$ 3,271,604