Condensed Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2014	Dec. 31, 2013
Current assets:
Cash and cash equivalents	$ 23,448	$ 28,306
Accounts receivable, net of allowance for doubtful accounts of $1,671 and $766, respectively	300,733	348,966
Inventories	40,563	32,335
Other current assets	87,747	96,546
Total current assets	452,491	506,153
Property and equipment	2,593,631	2,606,738
Accumulated depreciation	(1,268,123)	(1,241,092)
Property and equipment, net	1,325,508	1,365,646
Goodwill	601,839	624,875
Other intangible assets, net	29,639	41,146
Deferred financing costs, net	12,498	13,897
Other assets	35,631	35,753
TOTAL ASSETS	2,457,606	2,587,470
Current liabilities:
Accounts payable	65,679	58,826
Other current liabilities	151,164	169,945
Current portion of long-term debt	0	3,573
Total current liabilities	216,843	232,344
Long-term debt	718,704	763,981
Workers' compensation, vehicular and health insurance liabilities	31,384	29,944
Deferred tax liabilities	275,557	284,453
Other non-current liabilities	26,452	25,655
Commitments and contingencies
Equity:
Common stock, $0.10 par value; 200,000,000 shares authorized, 153,584,564 and 152,331,006 shares issued and outstanding	15,359	15,233
Additional paid-in capital	956,849	953,306
Accumulated other comprehensive loss	(17,415)	(15,414)
Retained earnings	233,873	297,968
Total equity	1,188,666	1,251,093
TOTAL LIABILITIES AND EQUITY	$ 2,457,606	$ 2,587,470