Consolidated Balance Sheets (USD $) In Thousands, unless otherwise specified	Jun. 30, 2012	Dec. 31, 2011
Current assets:
Cash and cash equivalents	$ 103,549	$ 78,458
Trade accounts receivable, net of allowance of $1,677 and $1,230, respectively	242,943	254,446
Accounts receivable - related parties	74	65
Income tax receivable	1,620	314
Inventories	39,794	34,963
Prepaid expenses	8,687	8,667
Other current assets	7,485	6,768
Deferred tax assets	15,321	39,154
Total current assets	419,473	422,835
Property and equipment, net	901,718	856,412
Deferred debt costs, net of amortization	14,881	16,131
Goodwill	89,504	82,571
Other intangible assets, net of amortization	77,884	74,637
Other assets	6,922	7,342
Total assets	1,510,382	1,459,928
Current liabilities:
Accounts payable	54,971	56,957
Accrued expenses	79,383	65,096
Current portion of long-term debt	35,078	34,115
Other current liabilities	1,911	315
Total current liabilities	171,343	156,483
Long-term debt, net of unamortized premium on notes of $1790 and $1,892, respectively	754,712	748,976
Deferred tax liabilities	179,667	183,551
Other long-term liabilities	13,023	11,215
Commitments and contingencies
Stockholders' equity:
Preferred stock; $.01 par value; 5,000,000 shares authorized; none designated or issued at June 30, 2012 and December 31, 2011
Common stock; $.01 par value; 80,000,000 shares authorized; 43,500,032 shares issued and 42,748,128 shares outstanding at June 30, 2012; 42,530,809 shares issued and 42,486,645 shares outstanding at December 31, 2011	435	425
Additional paid-in capital	350,440	345,619
Retained earnings	48,027	13,659
Treasury stock, at cost, 241,224 and 44,164 shares at June 30, 2012 and December 31, 2011, respectively	(7,265)	0
Total stockholders' equity	391,637	359,703
Total liabilities and stockholders' equity	$ 1,510,382	$ 1,459,928