Condensed Consolidated Balance Sheets - USD ($) $ in Thousands	Jun. 30, 2015	Dec. 31, 2014
Current assets:
Cash and cash equivalents	$ 225,481	$ 27,304
Accounts receivable, net of allowance for doubtful accounts of $4,973 and $2,925, respectively	181,234	289,466
Inventories	35,143	30,171
Other current assets	79,520	86,854
Total current assets	521,378	433,795
Property and equipment	2,548,319	2,555,515
Accumulated depreciation	(1,410,785)	(1,320,257)
Property and equipment, net	1,137,534	1,235,258
Goodwill	561,039	582,739
Other intangible assets, net	12,917	14,500
Other non-current assets	56,910	56,471
TOTAL ASSETS	2,289,778	2,322,763
Current liabilities:
Accounts payable	44,566	77,631
Current portion of long-term debt	3,150	0
Other current liabilities	110,223	164,227
Total current liabilities	157,939	241,858
Long-term debt	961,080	737,691
Workers' compensation, vehicular and health insurance liabilities	28,593	29,690
Deferred tax liabilities	178,263	228,394
Other non-current liabilities	$ 27,005	$ 27,067
Commitments and contingencies
Equity:
Common stock, $0.10 par value; 200,000,000 shares authorized, 157,654,235 and 153,557,108 shares issued and outstanding	$ 15,765	$ 15,356
Additional paid-in capital	963,612	960,647
Accumulated other comprehensive loss	(36,764)	(37,280)
Retained earnings (deficit)	(5,715)	119,340
Total equity	936,898	1,058,063
TOTAL LIABILITIES AND EQUITY	$ 2,289,778	$ 2,322,763